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S&S Cycle

S&S Cycle, Inc. is an American company specializing in the design, manufacturing, and distribution of high-performance V-twin motorcycle engines, components, and accessories, with a primary focus on enhancing Harley-Davidson motorcycles and other powersports applications.^[1]^[2] Founded in 1958 in Blue Island, Illinois, by George J. Smith and Stanley Stankos, the company began as a partnership producing lightweight aluminum pushrods and solid lifter conversion kits to improve engine performance and RPM capabilities on early Harley-Davidson models like the Knucklehead and Panhead.^[2]^[3] In 1959, Stanley Stankos sold his share to Marjorie Smith, renaming the business Smith & Smith Cycle Equipment, and the company quickly gained a reputation for innovative aftermarket parts that boosted power and reliability in V-twin engines.^[4] By 1963, seeking more space and a rural setting, the Smith family relocated operations to a farm outside Viola, Wisconsin, where S&S Cycle established its headquarters and continues to manufacture today, now employing advanced engineering for EPA-compliant engines and racing applications.^[2]^[5] Over its more than 65 years of operation, S&S Cycle has expanded from basic performance upgrades—such as stroker flywheels, Super E carburetors, and big bore cylinder kits in the 1970s and 1980s—to complete long-block engines in the 1990s, including innovative designs like the X-Wedge engine family introduced in the 2000s.^[6]^[7] The company has played a pivotal role in motorcycle racing, setting land-speed records and powering professional drag bikes.^[8] It also collaborated on production engines for brands like Indian Motorcycle during the early 2000s revival.^[9] Under subsequent leadership, including George B. Smith after his father's passing in 1980, S&S has maintained its status as a premium brand, offering custom configurations, remanufacturing services, and a museum showcasing its racing heritage at the Viola facility.^[4]^[5]

History

Founding and Early Years

S&S Cycle was founded in 1958 in Blue Island, Illinois, by George J. Smith and Stanley Stankos as a partnership specializing in high-performance motorcycle parts.^[6] The company emerged from the founders' shared passion for customizing Harley-Davidson motorcycles, drawing on Smith's post-World War II experience as a racer and engine modifier who had built competitive drag bikes like the "Tramp," a modified 61 cubic inch Knucklehead that achieved speeds around 125 mph in Midwest competitions.^[10] Stankos contributed his skills in auto trimming and machining, providing the initial workspace for their ventures.^[11] The first products offered by S&S Cycle were lightweight aluminum pushrod and solid lifter conversion kits designed for 61-inch and 74-inch Knucklehead and Panhead Harley-Davidson Big Twin engines.^[6] These innovations addressed common valve train inefficiencies in the era's V-twin motors, stemming directly from Smith's hands-on customization work after returning from military service as a pilot trainee.^[10] Early operations were modest, conducted in Stankos' upholstery and trim shop, where the partners not only prototyped parts but also assembled record-setting machines for speed trials, including a 92 cubic inch alcohol-fueled bike that George raced to 152.02 mph at the Bonneville Salt Flats in 1954—efforts that honed their expertise in high-performance engineering.^[11]^[10] In 1959, Stankos sold his stake in the business to focus on his auto trim service, with the buyout facilitated by Marjorie Smith, George's wife and a fellow motorcycle enthusiast who joined as a partner.^[11] This led to the company being renamed Smith & Smith, though it retained the S&S branding to honor its origins.^[6] Marjorie played a pivotal role in expanding reach by purchasing a mailing list of approximately 1,300 Harley-Davidson dealers and distributing promotional literature on the pushrod kits, which sparked nationwide mail-order sales targeting V-twin enthusiasts and laid the groundwork for broader distribution.^[6]

Expansion and Milestones

In 1969, S&S Cycle relocated its operations from Blue Island, Illinois, to Viola, Wisconsin, to accommodate growing demand and expand manufacturing capabilities in a more spacious rural setting.^[12] This move allowed the company to scale production of performance V-twin components while maintaining its focus on high-quality engineering.^[13] To further support increasing production needs, S&S Cycle opened an additional 170,000-square-foot facility in La Crosse, Wisconsin, in August 2004, serving as a dedicated warehouse, shipping center, and engineering hub.^[2] This expansion enhanced operational efficiency and enabled the company to handle larger volumes of orders for its performance parts and engines.^[14] The company's growth culminated in a major milestone with its 50th anniversary celebration held June 27-29, 2008, in La Crosse, Wisconsin, which drew over 28,000 motorcycle enthusiasts from around the world.^[15] The event featured factory tours, custom bike displays, live music, and demonstrations that underscored S&S Cycle's enduring legacy in V-twin heritage and innovation.^[16] In July 2007, S&S Cycle acquired the Flathead Power brand, a Swedish company specializing in vintage V-twin engine components, to broaden its offerings for classic motorcycle restoration.^[2] The acquisition included trademarks, patents, and designs, allowing S&S to produce and sell complete vintage engine assemblies.^[17] However, in 2015, the company transferred ownership of the Flathead Power brand back to its original founder, Anders Nygren, to refocus on core performance products.^[18] Leadership transitioned in 2021 with the appointment of Paul Skarie as president and CEO, bringing extensive experience from Harley-Davidson to guide the company's strategic direction.^[19] This change maintained the Smith family's ongoing involvement in ownership and operations, preserving the third-generation business's commitment to family values and performance excellence.^[20] In 2025, S&S Cycle announced its Vintage Tour, scheduled for later that year, featuring vintage engines and custom builders to celebrate its heritage.^[21] The company also promoted Charlie Hadayia to executive vice president of business development and Howard Kelly to vice president of marketing in April, and welcomed back Justin Bramstedt as senior manager of warranty and benchmarking in May.^[22]^[23]^[24] Additionally, S&S relaunched its Proven Performance Club in April to support racing customers.^[25] In October 2025, the company announced the passing of Tim Osterberg, vice president of new product development.^[26]

Legal Controversies

In March 2005, Harley-Davidson filed a lawsuit against S&S Cycle and Delkron, Inc., alleging patent and trademark infringement related to aftermarket parts for the Twin Cam engine, including components such as pushrods and cylinders that were claimed to copy proprietary designs.^[27] The suit, docketed as case number 2:05-cv-00836 in the U.S. District Court for the Eastern District of Wisconsin, accused S&S of producing and marketing parts that violated several Harley-Davidson patents and used trademarks without authorization, potentially misleading consumers about compatibility and origin.^[28] S&S responded by stating that it had reviewed the complaint and believed the claims lacked legal merit, emphasizing its respect for intellectual property while defending its product designs as non-infringing innovations in the performance aftermarket.^[29] The litigation was resolved through a confidential settlement agreement announced in April 2006, with the case officially closed on April 7, 2006.^[30]^[28] Under the terms, which remained private, S&S was permitted to continue manufacturing and selling its performance parts, albeit with modifications to certain designs to avoid direct replication of patented elements. Both companies expressed satisfaction with the outcome and a commitment to ongoing business operations without further conflict.^[30] This dispute underscored broader tensions in the motorcycle aftermarket industry, where original equipment manufacturers like Harley-Davidson seek to protect intellectual property against performance enhancers that closely mimic OEM components for compatibility with popular models such as the Twin Cam-equipped motorcycles.^[31] The case highlighted challenges in balancing innovation, consumer access to upgrades, and proprietary rights, influencing how aftermarket firms approach design similarities moving forward. No other significant legal controversies involving S&S Cycle have been reported through 2025.^[28]

Engine Technology

Core Innovations

S&S Cycle pioneered several key advancements in V-twin engine technology during the late 1950s and 1960s, focusing on enhancing valvetrain reliability and engine displacement to support higher performance levels. In 1958, the company introduced lightweight aluminum solid-lifter pushrod kits for 61 cubic inch and 74 cubic inch Knucklehead and Panhead Big Twin engines, which improved valvetrain efficiency by eliminating the limitations of hydraulic lifters and enabling higher RPM operation without excessive valvetrain bounce.^[2] By 1960, S&S developed the first stroker flywheel kits, featuring longer-stroke flywheels that increased engine displacement beyond stock configurations, allowing for greater torque and power output in Harley-Davidson-style V-twins while maintaining compatibility with existing crankcases.^[2] Building on these foundations, S&S Cycle advanced intake and combustion efficiency through innovative induction and head designs in the 1970s and beyond. The company introduced performance carburetors in 1967, evolving into larger single-carburetor models like the Super E by 1979, but also supported dual-carburetor setups for high-displacement engines to optimize fuel delivery and airflow, particularly in stroker applications exceeding 100 cubic inches.^[6] Complementing this, S&S developed high-flow cylinder heads, such as the Super Stock series starting in the late 1970s, with port designs that increased airflow by up to 30-40% over stock while preserving velocity for better mid-range torque, enabling significant power gains without compromising throttle response.^[32] A major departure from traditional Harley-Davidson architecture came with the X-Wedge engine family, introduced in 2007, which featured a 56-degree V-angle instead of the conventional 45 degrees to achieve superior primary balance and substantially reduce vibration at operating speeds.^[33] This design, incorporating a single-piece forged crankshaft and wedge-shaped combustion chambers, allowed for smoother operation and higher rev limits in air-cooled V-twins, marking S&S's push toward modern engineering principles while retaining the V-twin aesthetic.^[34] In response to evolving environmental regulations, S&S Cycle became the first aftermarket manufacturer to offer pre-certified EPA-compliant V-twin engines in 2006, with complete powertrain packages for 1984-1999 Big Twin chassis that met federal emissions standards through integrated fuel management and catalytic converter compatibility, all without compromising the high-performance output typical of their designs.^[35] These engines maintained stock-like power curves while passing certification testing, easing compliance for custom builders. Throughout its innovations, S&S emphasized lightweight materials to enhance durability under demanding conditions, beginning with aluminum pushrods in 1958 and extending to aluminum cylinders and heads by the 1980s, which provided superior heat dissipation and strength at high RPMs compared to cast iron alternatives, reducing overall engine weight by up to 20% in some applications.^[2] These components, often featuring hard-anodized finishes, supported sustained operation above 6,000 RPM in performance builds, contributing to the longevity of S&S-equipped engines in both street and racing use.

Engine Designs and Models

S&S Cycle's engine designs have evolved significantly since the company's early focus on performance upgrades for Harley-Davidson motorcycles, progressing from compatibility with vintage Panhead engines in the 1960s to contemporary big-bore powerplants exceeding 140 cubic inches (ci) that fit within stock Harley frames.^[3] Initially, S&S developed the P-Series engines as direct replacements for 1948–1965 Panhead models, emphasizing reliability and power through solid lifter conversions and lightweight components, which laid the groundwork for their Evolution-style engines introduced in the 1980s.^[3] By the 1990s and 2000s, the lineup expanded to include Twin Cam-compatible designs, culminating in the T143 series for 1999–2017 Big Twin models, a 143 ci (2,340 cc) engine delivering up to 162 horsepower and 151 ft-lb of torque while bolting directly into unmodified Harley-Davidson chassis.^[36] This progression reflects S&S's commitment to maximizing displacement and performance without requiring frame modifications, with modern offerings supporting displacements from 111 ci to 143 ci across Harley Evolution, Twin Cam, and Milwaukee-Eight platforms.^[37] The X-Wedge series, introduced in 2007, represents a departure from traditional 45-degree V-Twin architecture, featuring a narrow 56-degree cylinder angle to enhance combustion efficiency and reduce overall engine width for custom applications.^[38] Available in 117 ci configurations, the air-cooled, pushrod X-Wedge engine weighs approximately 150 pounds complete and was designed primarily for bespoke motorcycle frames rather than stock Harley-Davidson setups, though it powers select OEM models from manufacturers like Big Dog.^[33] Its innovative head design promotes better airflow and power delivery, making it suitable for high-performance customs where space constraints demand a more compact footprint.^[39] In the MK-Series, S&S offers advanced crate engines tailored for recent Harley-Davidson Milwaukee-Eight models, with the 2025 MK136B Black Edition standing out as a 136 ci powerhouse for 2018–2024 Softail and Touring variants.^[40] Built on MKB-Series crankcases, the MK136B incorporates high-flow cylinder heads with +1 mm oversized valves, .605-inch lift springs, and 550G-series cams, available in both race-only configurations and 49-state emissions-compliant versions that integrate seamlessly as bolt-in replacements.^[41] This series emphasizes blacked-out aesthetics and proven durability, supporting oil-cooled and twin-cooled M8 applications while maintaining compatibility with stock Harley electronics and exhaust systems.^[42] The V111 and Super Stock lines cater to street and drag-oriented builds, focusing on balanced performance in Evolution-era chassis from 1984–1999.^[43] The V111, a 111 ci engine with a short-stroke crankshaft for minimized vibration, delivers strong low-end torque and reliability, often paired with 585-series cams and requiring aftermarket ignition and induction for optimal output.^[43] Super Stock variants extend this to 111–124 ci displacements, incorporating dedicated ignition systems with rev-limit protection for break-in periods, ensuring they serve as dependable drop-in upgrades for both daily riding and competitive use in Harley Big Twin frames.^[44]

Certifications and Compliance

S&S Cycle achieved a significant milestone as the first aftermarket V-twin engine manufacturer to produce pre-certified engines compliant with United States Environmental Protection Agency (EPA) standards, beginning with select models in 2006. This certification covered 49-state EPA requirements, allowing these engines to be installed in vehicles without additional emissions testing by the builder. The initiative addressed the growing regulatory demands on motorcycle emissions, with S&S introducing certified X-Wedge engines by 2008 that met federal noise and emissions limits while maintaining high performance.^[45] For European markets, S&S Cycle obtained TÜV certification, a rigorous approval from the German Technical Inspection Association that verifies safety, emissions, and noise compliance under EU standards. Starting around 2005, models such as the S&S 96 and T124 engines received TÜV approval for carbureted and fuel-injected variants, enabling legal export and street use in countries adhering to Euro III regulations. These certifications ensured that exported engines adhered to stringent international norms without compromising durability or power output.^[46]^[47] In response to California's strict emissions rules, S&S Cycle secured approval from the California Air Resources Board (CARB) for low-emission engine variants, facilitating sales in that state and other areas with similar standards. This approval, granted by 2009, applied to engines for new-build custom motorcycles, requiring builders to report vehicle identification numbers to maintain compliance. S&S's CARB-compliant offerings include specific exhaust and induction systems designed to reduce pollutants while preserving performance.^[48]^[49] S&S Cycle continues to update its engines for evolving regulations, with adaptations for 2025 models ensuring compliance with updated federal EPA and state standards, including CARB, without sacrificing horsepower or torque. These ongoing efforts, detailed in the company's 2025 performance parts catalog, reflect a commitment to regulatory alignment across markets. Overall, these certifications have expanded market access for S&S's street-legal high-performance V-twin engines, enabling broader adoption in both domestic and international custom applications.^[50]^[51]

Products

Performance Components

S&S Cycle offers a range of performance components designed to enhance the power output and efficiency of existing Harley-Davidson engines through targeted upgrades to key internals. These modular parts allow enthusiasts to customize and boost engine performance without requiring complete engine replacements. Among the core offerings are high-performance camshafts, advanced fueling systems, optimized exhaust components, upgraded cylinder heads and pistons, and robust lower-end assemblies. Camshafts from S&S Cycle, such as the 640 series, feature high-lift profiles reaching .640 inches, which extend valve timing duration to improve airflow and combustion efficiency. These cams are engineered for engines of 95 cubic inches or larger, with recommended compression ratios between 10.5:1 and 11.5:1, delivering significant horsepower gains particularly in the 3,000 to 6,000 RPM range while enhancing torque across the powerband.^[52] High-lift valve springs are required to accommodate the aggressive lift and prevent valve float under high-rev conditions.^[52] For precise fueling in high-output configurations, S&S Cycle provides carburetor and fuel injection kits tailored to demanding street and performance applications. The Super E carburetor, with its 1-7/8 inch bore, is designed for Harley-Davidson motorcycles and supports tunable fuel mixtures for elevated power levels.^[53] Complementing this, the Throttle Body systems, such as the 52mm kit, feature larger bores that flow ample air for big-inch setups, ensuring accurate fuel metering and improved throttle sensitivity in electronic fuel-injected Harley-Davidson Big Twins from 2002 onward.^[54] Exhaust systems like the SuperStreet 2:1 headers are constructed from stainless steel with stepped designs and tuned baffles to optimize exhaust gas velocity and backpressure, promoting better scavenging and torque development without excessive noise. These headers maintain class-leading ground clearance and compatibility with OEM components, while full heat shields ensure durability in performance-oriented builds.^[55] Cylinder heads and pistons from S&S Cycle focus on airflow and compression enhancements for greater thermal efficiency. Ported aluminum heads, available through CNC porting services, feature machined intake and exhaust ports that increase velocity and throttle response, yielding consistent power improvements in engines from 88 to 124 cubic inches. Paired with forged pistons, these components support compression ratios up to 11:1, as seen in high-compression kits that boost output while maintaining reliability under stress.^[56]^[57] Crankcases and flywheels offer billet construction options optimized for stroker kits, enabling displacement increases through extended strokes up to 4-5/8 inches. Billet crankcases, such as those in the MK-Series and PS160 Gen2 lines, provide superior strength and precision machining to handle the stresses of larger bores like 5-1/8 inches, while stroker flywheel assemblies—often forged steel with heavy-duty rods—facilitate reliable high-RPM operation and torque multiplication in customized engines.^[58]^[59]

Complete Engines

S&S Cycle offers a range of ready-to-install crate engines designed for direct installation into Harley-Davidson frames, providing turnkey performance upgrades for enthusiasts seeking enhanced power without extensive custom building.^[37] One prominent example is the T124 Super Stock low-compression engine, a 124 cubic inch (ci) assembly compatible with 1999-2017 Twin Cam models, featuring a 4-1/8-inch bore, 4-5/8-inch stroke, and 10.2:1 compression ratio for reliable street torque.^[60] This engine utilizes S&S Super Stock heads, T2 crankcases, and a TC3 oil pump, while maintaining compatibility with existing Harley-Davidson transmissions and oiling systems.^[61] Customization options allow tuners to configure these crate engines from mild street setups to high-output race versions exceeding 200 horsepower, primarily through selectable cams such as the 475G for balanced performance or the 640 for peak power, along with adjustable compression and exhaust pairings.^[62] A recent addition is the 2025 MK136B series, including blacked-out editions tailored for 2018-2024 M8 Softail models and 2017-2025 M8 Touring models, which integrate 136 ci displacement with MKB-Series crankcases, high-flow cylinder heads featuring +1mm valves and .605-inch springs, and a fully self-contained oiling system for oil-cooled applications.^[40]^[63] Equipped with a 475 cam, the MK136B achieves up to 121.65 horsepower and 145.41 foot-pounds of torque, emphasizing bolt-in simplicity for models like the Fat Boy or Low Rider.^[64] Each complete engine undergoes in-house assembly at S&S facilities, followed by rigorous dyno testing to verify performance and quality assurance before shipping, ensuring 100% reliability under load.^[7] Pricing for these crate engines typically ranges from $8,000 to $15,000, depending on model and configuration, with availability through authorized S&S dealers for professional installation.^[65]

Accessories and Kits

S&S Cycle offers a range of air cleaners designed to enhance engine intake efficiency, featuring high-flow cone filters equipped with velocity stacks for optimized airflow. The Stealth Air Cleaner Kit incorporates a unique stinger cone that acts as a velocity stack, directing air smoothly into the carburetor or throttle body while reducing turbulence and increasing flow velocity for improved power output.^[66] This design includes an offset polymer adapter and a pleated, washable filter element, compatible with various Harley-Davidson models such as 2008-2016 Touring bikes, providing a cool intake sound and straightforward installation.^[67] Additionally, the Tuned Induction Air Cleaner utilizes dual laser-cut tubes merged into a single collector with high-flow filters, promoting smoother air entry and enhanced performance across Big Twin applications.^[68] In clutch and transmission upgrades, S&S Cycle provides heavy-duty components suited for high-torque scenarios, including wet clutch enhancements that bolster durability under demanding conditions. The Variable Pressure Plate Clutch increases clamping force by up to 50% over stock without requiring modifications, making it an effective upgrade for handling elevated engine outputs.^[69] This system features a redesigned pressure plate that modulates engagement for smoother operation and reduced slippage in high-performance setups.^[69] Complementing these are heavy-duty diaphragm springs for 1998-2016 Big Twins, which reinforce clutch capacity to manage torque spikes from modified engines.^[70] Installation kits from S&S Cycle streamline upgrades with bolt-on packages tailored to specific Harley-Davidson models, incorporating essential gaskets, hardware, and tuning guides. These kits, such as the Long-Block Installation Kit, include high-compression components with pre-machined heads, gaskets, and fasteners for seamless integration into stock frames, often featuring 10.8:1 compression ratios for street performance.^[71] Power Packages extend this approach by bundling bolt-in elements like cylinder kits and hardware sets, complete with step-by-step installation instructions to ensure compatibility and proper tuning without extensive disassembly.^[72] S&S Cycle's apparel and branded merchandise reflect its heritage, with items like anniversary edition parts tied to milestone celebrations. The 65th Anniversary collaboration with Dixxon includes a limited flannel shirt featuring the company's logo and snap closures, commemorating over six decades of innovation.^[73] Earlier, the 60th Anniversary edition introduced nickel-finished components alongside branded apparel such as T-shirts with performance motifs, emphasizing the firm's racing legacy.^[74] Recent 2024-2025 updates include new Sportster-compatible exhaust internals adapted from Big Twin designs, enhancing mid-range torque and sound profiles, as well as expanded crate engine options like the MK136B series released in August 2025.^[75] The SuperStreet 2-into-1 system ports proven Big Twin internals to late-model Sportsters, delivering increased power through stepped headers and full heat shields in stainless or black finishes.^[76] These updates ensure compatibility with 2024-2025 models like the Nightster Special, where S&S exhaust mufflers provide a deeper, more authentic V-twin rumble.^[77]

Applications

Harley-Davidson Models

S&S Cycle products offer direct compatibility with Harley-Davidson Big Twin engines across multiple eras, enabling seamless upgrades for Evolution models produced from 1984 to 1999, Twin Cam engines from 1999 to 2017, and Milwaukee-Eight engines introduced in 2017 and continuing through current models.^[43]^[36]^[78] Long block engines and performance kits from S&S, such as the V111 and T143 series, bolt into stock Harley-Davidson chassis without requiring frame alterations, preserving the original motorcycle architecture while enhancing displacement and output.^[79]^[80] For Harley-Davidson Sportster models with 883 or 1200 cubic inch engines, S&S pushrod and cam kits provide popular upgrades that significantly increase performance, typically boosting output from around 50 horsepower in stock 883 configurations to over 80 horsepower when paired with complementary intake and exhaust components.^[81] The Hooligan Big Bore and Cam Kit, for instance, enlarges displacement to 1250 cubic inches while retaining stock heads and pushrods, delivering up to 85 horsepower for improved torque and acceleration in these middleweight models.^[82] S&S components have been integrated into Harley-Davidson's Custom Vehicle Operations (CVO) high-performance variants through aftermarket applications, with air cleaners, cam chests, and exhaust systems commonly fitted to models like the CVO Street Glide and Road Glide for enhanced power delivery.^[83] Installation examples include the drop-in T111 111 cubic inch long block kit for Touring models from 2007 onward, which installs without frame modifications and provides substantial torque gains for long-distance riding.^[84]^[85] In the aftermarket sector for Harley-Davidson engines displacing 74 cubic inches and larger, S&S Cycle maintains a dominant position, recognized as the leader in high-performance parts due to its extensive range of big bore kits and engines that outperform competitors in reliability and power.^[1]^[86]

Custom and Specialty Vehicles

S&S Cycle has played a significant role in powering custom choppers and bobbers through collaborative projects with renowned builders, exemplified by the 2025 Vintage Tour initiative. This tour featured six talented builders creating unique motorcycles using three distinct S&S vintage powerplants, with no restrictions on design to foster creativity in the custom industry. The resulting bikes, including Panhead-style projects like the Viola Flyer, were showcased at major events such as Daytona Bike Week, highlighting S&S engines in stripped-down, personalized configurations typical of choppers and bobbers.^[21] In high-end custom applications, S&S engines have been integrated into luxury motorcycles from Confederate Motors, later rebranded as Curtiss Motorcycle Co. The P-51 Combat Fighter model utilized the S&S X-Wedge 132 cubic inch V-twin engine, offering substantial power output aimed at exceeding 200 horsepower, though final performance fell short of initial targets. This collaboration underscored S&S's capability to supply bespoke, high-displacement powertrains for premium, limited-production customs that blend aviation-inspired aesthetics with advanced engineering.^[87]^[88] S&S Cycle's X-Wedge engine found a distinctive application in the modern revival of Morgan 3-Wheelers, where it powered the production models from 2012 to 2021 as a purpose-built 2-liter (approximately 122 cubic inch) V-twin. Designed from a clean sheet of paper specifically for the trike's lightweight chassis, the air-cooled X-Wedge provided robust torque and a characteristic rumble, enabling the vehicle to achieve spirited performance while maintaining its retro three-wheeler heritage. This installation marked one of S&S's few forays into non-traditional motorcycle formats, emphasizing adaptability for specialty vehicles like cyclecars.^[89]^[90]^[91] Beyond Harley-Davidson platforms, S&S offers adapted aftermarket components for Indian and Victory motorcycles, supporting performance upgrades on these non-Harley V-twins. The company's catalog includes replacement parts such as rocker arms, tappets, throttle bodies, and exhaust systems tailored for Indian models like the Scout, as well as compatible accessories for discontinued Victory lines. These offerings allow owners to enhance torque and horsepower on Polaris-built V-twins using S&S's proven engineering, without requiring full engine swaps.^[92]^[93]^[94] S&S engines have also powered specialty projects in land speed record attempts at the Bonneville Salt Flats, with involvement dating back to the company's early years. Founder George J. Smith raced at Bonneville in the 1950s, using the flats as a testing ground that informed S&S product development, and by the 1960s, the firm contributed to record-setting streamlined motorcycles in carbureted classes. More recently, S&S-built engines propelled an Indian Challenger to a new American production touring bike record of 194.384 mph in 2025, while engineer Jeff Bailey set a 174.996 mph mark in the 1350cc pushrod gas class in 2010. These efforts demonstrate S&S's enduring focus on high-speed, record-oriented applications.^[2]^[95]^[6]^[96]

Racing and Events

Motorsports Involvement

S&S Cycle has a long history of involvement in competitive motorcycle racing, particularly in drag racing, where its high-performance engines have powered professional classes since the early 1980s.^[2] In the early 1980s, the company began developing specialized engines for professional drag racing, which contributed to the evolution of the NHRA Pro Stock Motorcycle class following its introduction in 1987.^[2] These engines were instrumental in the competitive landscape of Pro Stock drag racing through the 1980s and 1990s, supporting riders in high-stakes quarter-mile events.^[97] Beyond drag racing, S&S Cycle has provided engine tuning expertise for flat-track and road racing under the AMA umbrella, including high-compression setups optimized for performance in series like American Flat Track.^[98] The company's components, such as performance exhaust systems and prepped engines, have been used in AMA-sanctioned events to enhance power output and reliability on dirt ovals and paved circuits.^[99] For instance, S&S has served as the official exhaust provider for Progressive American Flat Track since 2022, supporting the Mission SuperTwins class with tuning solutions that emphasize high-compression configurations for competitive edge.^[100] In recent years, S&S Cycle expanded its motorsports engagement through sponsorship of the MotoAmerica Mission King of the Baggers series, partnering with Indian Motorcycle as the factory team preparer.^[101] Rider Loris Baz joined the S&S-prepped Indian Motorcycle team for the 2025 season, competing on tuned Challenger models in the V-twin touring class.^[102] To further support racers, S&S launched the Proven Performance Club in April 2025, a rewards program for competitors using its parts in drag racing and land speed events, offering commemorative T-shirts and patches for verified accomplishments.^[25] The 2025 King of the Baggers season marked notable achievements for S&S Cycle, with its riders securing strong finishes culminating at the New Jersey Motorsports Park finale.^[103] Loris Baz ended the year in second place overall, while teammate Troy Herfoss took third, highlighting podium positions in the championship standings announced after the double-header event.^[104] These results underscored S&S Cycle's tuning prowess in delivering competitive performance across the 12-round series.^[105]

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[19]
Paul Skarie named S&S Cycle's New President & CEO
Jun 2, 2021 · S&S Cycle, the de facto leader in motorcycle performance, welcomes new company President & CEO, Paul Skarie.
[20]
S&S Cycle hires new president, CEO - Powersports Business
Jun 3, 2021 · Paul Skarie has been named president and CEO of S&S Cycle. He brings 15 years of experience at Harley-Davidson Motor Company.
[21]
Harley Lawsuit against S&S and Delkron | V-Twin Forum
Jul 14, 2005 · 05-C-0298) on March 17, 2005, the lawsuit alleges that the companies copied parts related to the Harley-Davidson Twin Cam 88 engine (right), as ...Harley sues S & S | V-Twin ForumHarley sues S & S | Page 3 - V-Twin ForumMore results from www.v-twinforum.com
[22]
Harley-Davidson Motor Company Group Inc et al v. S&S Cycle Inc DC
Parties, patents and docket of H D Michigan Inc. v. S And S Cycle Inc. (2:05-cv-00836) from Eastern District of Wisconsin filed on 08/05/2005 and closed on ...
[23]
Harley vs S&S Lawsuit | Cycle Forums
Mar 27, 2005 · VIOLA, WI (March 24, 2005) S&S Cycle was recently named in a lawsuit brought by Harley-Davidson concerning alleged infringement of several ...
[24]
S&S and Harley Davidson Reach Agreement - The Kneeslider
Apr 21, 2006 · In March 2005, Harley-Davidson filed a Complaint against S&S alleging various acts of patent and trademark infringement. The companies ...
[25]
Harley Sues S&S for Patent Infringement | Two Wheeled Texans
Harley-Davidson recently filed a lawsuit against aftermarket engine builders S&S Cycles and Delkron, claiming the companies violated patent rights.
[26]
Shop by Products - Cylinder Heads - S&S Cycle
Head, Kit, Stock Bore, Complete Assembly, .480" Dual Steel, Packaged, Hi-Temp Black, 1936-'47 bt OHV & KN Series ... Replacement Stock Bore Cylinder Heads ...Missing: flow development
[27]
S&S Cycle X-Wedge Engine - First Look - Hot Bike Magazine
It is an air-cooled, pushrod, 56-degree V-Twin. Built with commonized engine parts and fasteners, it utilizes a simplified design, providing 30% fewer parts ...
[28]
X Wedge | Cycle World | JANUARY 2007
Jan 1, 2007 · X-Wedge's 56-degree Vee makes its vibration easier to manage than it is for 45-degree cylinders. Even though this engine is big, its vibration ...
[29]
[PDF] Just The Facts! - DB2 Outlet LLC
Jul 25, 2006 · S&S® Cycle is pleased to introduce the first of our EPA certified engine packages for new builds in custom 1984-'99 style big twin chassis.<|separator|>
[30]
T143 Engines for 1999-'17 Big Twins - S&S Cycle
The S&S T143 Long Block engine for Harley- Davidson® models is the largest S&S engine that will fit in a stock Harley- Davidson® chassis. It's big, 143 cubic ...Wrinkle Black · T143 Assembled Long Block... · 635 GPE CamsMissing: EPA- 2000s
[31]
Shop by Products - Engines - S&S Cycle
Filter by: · Subcategories · Price · MK136B Black Edition 49 State Engine for 2018-2020 M8 Softail Models · MK136B Black Edition Race Only for 2018-2024 M8 Softail ...
[32]
S&S XW117 X-Wedge - Motorcyclist
Aug 30, 2010 · The soul of the XW117 is the company's all-new, 56-degree X-Wedge engine--the first that's not derivative of Harley's iconic, 45-degree design.
[33]
https://hotbike.com/ss-cycle-x-wedge-engine-first-look/
[34]
S&S Releases All-New MK136B Black Edition Engine for Softails
Aug 19, 2025 · S&S Cycle released its all-new MK136B Black Edition Crate Engine, built specifically for 2018–2024 Harley-Davidson Softail models.Missing: MK- | Show results with:MK-
[35]
MK136B Black Edition Race Only for 2018-2024 M8 Softail Models
We took our MKB-Series Crankcases, married them to the 136” cylinders and flywheels, and then fit High-flow cylinder heads with +1mm Valves and .605” springs.Missing: MK- | Show results with:MK-
[36]
MK136 Engine for 2017-23 M8 Touring - S&S Cycle
MK136 BLACK EDITION ENGINE. Introducing the next generation of Proven Performance for your 2017 & newer H-D Touring Models, the MK136 Engine.
[37]
V111 Black Edition Longblock Engine for 1984-'99 HD® Models with ...
Out of stockS&S V111 engines are perfect for applications that require great horsepower and torque, but not at the expense of dependability and engine life.
[38]
Super Stock® Ignition Kit for HD® Evolution® 111", 117", and 124 ...
In stockThe S&S Super Stock ignition system features a break-in rev limit function. The break-in rev limit protects a new engine from damage with a fairly low initial ...
[41]
[PDF] S&S® Cycle, Inc.
Mar 10, 2008 · This S&S T124 Engine has been manufactured, assembled, and calibrated by S&S Cycle, Inc. Before proceeding, verify that this engine fulfills ...
[42]
CARB Compliant - S&S Cycle
Emissions Notice to S&S Cycle Customers in California. California regulates motorcycle aftermarket parts that have the potential to impact emissions. In many ...Missing: approval | Show results with:approval
[43]
CARB approved S&S to sell new build custom bike engines ...
The California Air Resources Board approved S&S Cycle to sell engines for new build custom bikes in California, reported S&S Cycle.
[44]
Emissions Certifications - S&S Cycle
The S&S Emissions Certification Laboratory (ECL) has been up and running since January of 2008. The ECL is a recognized testing facility by the US Environmental ...
[45]
S&S Cycle - S&S Performance Parts 2025 L - Volume 67
Soon enough a company was born, S&S (Smith and Stankos) started selling their first part, light-weight aluminum pushrods. ... • 38% increase in flow compared to ...
[46]
Cam Specs & Overview - S&S Cycle
High lift S&S valve springs are required. 640: Used in S&S T124 engines, this cam makes horsepower! Intended for engines of 95 CID or more w/compression ratios ...
[48]
52mm Throttle Body Kit for 2002-'05 EFI HD® Big Twin - S&S Cycle
Fits: 2002-'05 EFI HD Big Twins and 2001 HD Softail Models. S&S 52mm bore throttle body flows more than enough air for all but the most demanding street ...Missing: injection | Show results with:injection
[49]
SuperStreet 2:1 Exhaust System - 50 State Legal
NEW FOR 2022, Brushed Stainless shields & muffler (for standard chassis only)!; Stainless steel stepped header; Class-leading ground clearance; Works with OEM & ...Missing: tuned | Show results with:tuned
[50]
S&S® CNC Cylinder Head Porting Service For 1999-'17 HD® Big ...
Ideal for 88" - 124" engines · CNC machined ports for a consistent performance increase from stock heads · Great throttle response, high velocity port without ...Missing: aluminum | Show results with:aluminum
[51]
High Compression Pistons for 2007-'17 HD® CVO® 110 Engines ...
In stockIncrease the compression ratio from the stock 9.3:1 to 10.6:1 with these S&S® high compression pistons - brings the horsepower up to 114. *Is not compatibable ...
[52]
MK-Series Crankcase Assembly for 2018-up M8 Softail® Models
In stockOur new MK-Series B Crankcases can be paired with our 136” cylinder kit and 4 5/8” Stroker Crank to give you a rock-solid build.
[53]
https://www.sscycle.com/products/super-e-carburetor/
[54]
T124 T-Series Long Block Engine for 2007-'16 Touring Models
Out of stockEngine features 4-5/8" stroke X 4-1/8" bore at 10.2:1 compression, S&S 585 gear drive Easy Start cams, S&S TC3 cam plate and oil pump, and wrinkle black powder ...
[55]
T124 T-Series Long Block High Compression Engine for 2007-Up ...
Out of stockEngine features 4-5/8" stroke X 4-1/8" bore at 10.8:1 compression, S&S gear drive 640 Easy Start cams, S&S TC3 cam plate and oil pump, and black wrinkle powder ...
[56]
S&S Cycle MK136 Crate Engine - Motorcycle & Powersports News
May 6, 2024 · The MK136 is the latest in the line of complete replacement engines for your Harley-Davidson and S&S Cycle's first for 2017 and later models.
[57]
Tech Tuesday: S&S MK136 Crate Engine - MotoAmerica
Equipped with a 475 cam, the S&S MK136 Crate Engine produces up to 121.65 horsepower and 145.41 foot-pounds of torque.
[58]
https://www.sscycle.com/products/mk-series-crankcase-assembly-for-2018-up-m8-softail-models/
[59]
https://vtwin.parts/supplier/ss-cycle/engine-components/harley-davidson-indian-motorcycle-ss-cycle-samp%3Bs-cycle-crankcase-assembly-5-18-bore-packaged-natural-billet-ps160-gen2-310-0884
[60]
High-Flow Stealth Filter - S&S Cycle
High-Flow Stealth Filter ... This pleated Stealth air filter element is washable and reusable to last for years. 0 Reviews.Missing: cone | Show results with:cone
[61]
Updated Tuned Induction Air Cleaner Kit - S&S Cycle
The S&S Cycle Tuned Induction Air Cleaner uses two laser cut and highly engineered tubes merged into a single collector and fed by a pair of high flow air ...
[62]
https://www.motorcyclepowersportsnews.com/ss-cycle-mk136-crate-engine/
[63]
Introducing S&S Cycle Variable Pressure Plate Clutches!
Jan 31, 2025 · The S&S Cycle Variable Pressure Plate Clutch is an easy and cost effective way to upgrade your stock H-D® clutch in a Touring or Softail model.
[64]
Shop by Products - Clutch - S&S Cycle
No readable text found in the HTML.<|separator|>
[65]
S&S CYCLE 0950-0848 310-0870 Long-Block Installation Kit - eBay
Free deliveryFeatures. High Compression, 10.8:1 for the ultimate in street performance; No fuel system or ignition systems included; Special head machining fits stock ...
[66]
Shop By Category - Performance Kits - 100/110 Power Package
Contains an S&S 4” big bore cylinder kit S&S 585 cams, S&S Quickee Pushrods, and S&S Premium Hydraulic tappets to make the most of the added displacement.
[67]
https://www.sscycle.com/products/high-flow-stealth-filter/
[68]
S&S Cycle 60th Anniversary Engine Launched - Hot Bike Magazine
Sep 18, 2018 · S&S Cycle turns 60 in 2018, so the V-twin performance legend created a limited-edition 124ci engine with a nickel finish that would make any ...<|separator|>
[69]
SuperStreet Two into One Exhaust System for late model Sportsters
Mar 4, 2020 · The S&S R&D team took their proven 2:1 SuperStreet exhaust internals and finally ported them over to the Sportster platform.Missing: Big | Show results with:Big
[70]
2025 nightster special with s&s exhaust muffler upgrade - Facebook
Aug 28, 2024 · 2025 nightster special. Finally got the S&S exhaust muffler. The sound is amazing. 10x's improvement. Sounds like a Harley now!Missing: ported | Show results with:ported
[71]
https://www.ebay.com/itm/335752597432
[72]
T111 Black Edition Longblock Engine for Select 1999-'06 HD® Twin ...
Out of stockS&S T111 engines are perfect for applications that require great horsepower and torque. The easy start cams make starting even easier.
[73]
TWIN CAM HARLEY REPLACEMENT ENGINE 111"/124" 2007-UP
Nov 18, 2021 · The S&S Cycle T111, T124 and T124LC Long Block Engines will bolt directly into your stock touring chassis with no modifications.Missing: ci | Show results with:ci
[74]
https://hotbike.com/ss-cycle-60th-anniversary-engine-launched/
[75]
https://www.motorcyclepowersportsnews.com/ss-cycle-announces-all-new-mk136b-engine/
[76]
https://info.sscycle.com/performance-times/new-superstreet-two-into-one-exhaust-system-for-late-model-sportsters
[77]
T111 T-Series Long Block Engine for 2007-Up Touring Models
Out of stockThis S&S 111 cubic inch T111 Long Block engine fits 2007-'16 HD touring bikes except Twin-Cooled models. Long Block engines do not include a fuel or ignition ...Missing: ci | Show results with:ci
[78]
https://www.sscycle.com/shop-by-category/performance-kits/129-132-power-package/
[79]
S&S Cycle's New Big Bore Kit | Hot Bike Magazine
Aug 15, 2022 · S&S Cycle's new Big Bore Kits take the stock Milwaukee-Eight engine to either 129 cubic inches or 132 cubic inches of tire melting power.
[80]
S&S Cycle Announces Vintage Tour 2025
Feb 17, 2025 · The 2025 S&S Cycle Vintage Tour 2025 will showcase three vintage powerplants and six talented bike builders. The bikes will tour with the S&S ...Missing: bobbers | Show results with:bobbers
[81]
New Confederate Motorcycle Website Has Launched: Bikes, Parts ...
Apr 11, 2019 · The P-51 Combat Fighter is available with the S&S X-Wedge 132 cubic inch engine; a choice of two different handlebars; rear, mid or forward foot ...
[82]
Confederate Motors - Bhamwiki
Jan 5, 2021 · The company's attempts to secure a 200 horsepower S&S X-Wedge engine for the P51 Combat Fighter model fell short of expectations. In late 2017 ...
[83]
Introducing: The new X-Wedge powered Morgan 3 Wheeler
Mar 31, 2011 · The Morgan 3 Wheeler is running the one of a kind X-Wedge engine made by yours truly, S&S Cycle. The X-Wedge was designed by S&S engineers from a clean sheet ...
[84]
Morgan 3 Wheeler (2012 - 2021) review - engine and gearbox | Evo
Rating 4.0 The engine and gearbox are two of the 3 Wheeler's strongest points. American motorcycle engine manufacturer S&S produces the 2-litre V-Twin 'X-Wedge'.
[85]
https://www.jpcycles.com/product/ss-cycle-t111-long-block-engine-with-easy-start-585-camshafts-for-harley-touring-2007-2016
[86]
Shop By Category - Indian Motorcycles - S&S Cycle
Exhaust Systems for Indian FTR 1200 · Engine Control Manager for Indian FTR 1200 · Slip-Ons for Indian Touring · Grand National 2:1 Exhaust System · Grand National ...
[87]
https://news.dupontregistry.com/sponsored/new-confederate-motorcycle-website/
[88]
https://www.bhamwiki.com/w/Confederate_Motors
[89]
S&S Cycle's Jeff Bailey SMASHES speed record @ Bonneville!
Sep 27, 2010 · S&S Cycle's Jeff Bailey SMASHES speed record @ Bonneville! · Run 4: 174.996, but had a 180.38 speed through the first quarter mile – set a new ...
[90]
Indian Challenger shatters 58-year land speed record at Bonneville
Sep 29, 2025 · Indian Challenger, ridden by Tyler O'Hara, smashes a 58-year-old motorcycle land speed record at Bonneville, hitting 194.384 mph on the ...
[91]
PRO STOCK BIKE TURNS 25 THIS SEASON - Competition Plus
Mar 8, 2012 · The last 25 years, NHRA's Pro Stock Motorcycle class has experienced quite an evolution. In 1987, NHRA introduced the Pro Stock Motorcycle ...
[92]
S&S Cycle Returns as Official Exhaust of Progressive AFT ...
Mar 30, 2022 · (March 30, 2022) – Progressive American Flat Track announced today that S&S Cycle will once again serve as the Official Exhaust of ...
[93]
Flatout on S&S Cycle's New Hooligan Sportsters - Cycle World
Feb 26, 2016 · A 100-hp, S&S Cycles-prepped Harley Davidson Sportster, a Dr. Pepper-coated concrete track, and almost no room between the race line and ...
[94]
American Flat Track: S&S Cycle Named Official Exhaust
Mar 30, 2022 · S&S Cycle has been named the Official Exhaust of Progressive AFT as well as the presenting sponsor for the Mission SuperTwins class.Missing: tuning | Show results with:tuning
[95]
INDIAN MOTORCYCLE BEGINS NEW CHAPTER FOR ITS ...
Feb 13, 2025 · Indian Motorcycle announced the expansion of its Indian Motorcycle-S&S® Cycle factory team, adding French MotoGP® veteran Loris Baz to the lineup.
[96]
Indian Motorcycle begins new chapter for its historic Wrecking Crew ...
Feb 13, 2025 · French Road Racer & MotoGP® Veteran Loris Baz Joins Reigning Champion Troy Herfoss & Two-Time Champion Tyler O'Hara for 2025 Race Season ...
[97]
S&S Cycle Announces Proven Performance Club
Apr 26, 2025 · April of 2025 will see the launch of our Proven Performance Club! S&S Cycle invites those who race ¼ mile drags, 1/8 mile drags and Land Speed ...
[98]
The 2025 King of the Baggers series culminated in New Jersey this ...
Sep 29, 2025 · The S&S team wraps up the season with Loris Baz in the number two spot, Troy Herfoss in the number three spot and Tyler O'Hara in number 5.Missing: sponsorship | Show results with:sponsorship
[99]
The 2025 King of the Baggers series culminated in New Jersey this ...
Sep 29, 2025 · The 2025 King of the Baggers series culminated in New Jersey this past weekend. The S&S team wraps up the season with Loris Baz in the ...
[100]
2025 King of the Baggers Champ Is Crowned - Motorcycle Cruiser
Sep 17, 2025 · 2025 King of the Baggers Champ Is Crowned · Troy Herfoss (Ind) S&S/Indian Motorcycle · Loris Baz (Ind) S&S/Indian Motorcycle · Bradley Smith (H-D) ...Missing: sponsorship | Show results with:sponsorship
[101]
Press Release S&S Cycle 50th Anniversary |
Jul 4, 2008 · Total attendance through the whole three days exceeded 28,000 paid (spectators 12 and under were admitted free) on the festival grounds, however ...
[102]
S&S Cycle Donates Engines, Then Teaches V-Twin 101 To Local ...
Dec 13, 2018 · The hands-on program has the kids handling all the engine parts while learning the principles of internal combustion. Courtesy S&S Cycle. It ...
[103]
S&S Cycle and @tunnel2towers have a special announcement as ...
Feb 27, 2025 · S&S Cycle and @tunnel2towers have a special announcement as we head into Daytona Bike Week. S&S Cycle will be supporting Tunnel2Towers in a ...
[104]
Are you ready for STURGIS?! - Performance Times from S&S Cycle
The Women & Wheels Bike Show starts at 8am on Tuesday Aug 7, at the FREE Crossroads area of Buffalo Chip. This show features bikes built, and ridden by women, ...
[105]
S&S CYCLE ANNOUNCES VINTAGE TOUR 2025 - Bikernet.com
Feb 28, 2025 · This unveiling celebrates both the coolness of the bikes being built (and yes, in true custom fashion, they are still being built at the time of ...Missing: bobbers | Show results with:bobbers
[106]
S&S Cycle Brings Vintage Tour Build-Off to Mooneyes Japan
Jul 13, 2025 · S&S Cycle's Vintage Tour custom motorcycle build-off heads to Japan with three custom builders selected for Mooneyes Hot Rod Custom Show.
[107]
S&S Cycle Announces Vintage Tour Japan - Motor Sports NewsWire
Jul 11, 2025 · On December 7 th , 2025 at the Mooneyes Show in Yokohama, Japan, three very special builders will compete in a one-day build off to become the S&S Cycle ...