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HARLEY-DAVIDSON Engine Kits & Rotating Assemblies
S&S Cycle 98 in. Big Bore Kits
S&S Cycle 98 in. big bore kits are a fantastic upgrade if your Harley® is just a bit tired. The thicker and beefier cylinders mean that the engine will run cooler and you'll love the forged pistons that come with the kits. These are the largest bores that can be fit in your stock engine case. The cylinder and piston kits make going to the max bore size easy. There is no machining required and stock engine height is maintained. These kits come with nearly everything needed to get the most out of the added cu. in. to your stock engine. You won't believe how much power these kits produce! Features and specifications: * Kit yields excellent results with stock cylinder heads * Easy installation—no need to bore or split existing cases, just swap the cylinders * Available in a choice of either black or silver powdercoat finish with polished fins * Increased fin area for better heat dissipation * Valve pocket recessed in S&S pistons are enlarged for oversize valves and higher lift cams
Not Yet Reviewed
$1,386.95
S&S Cycle 883 to 1200cc Hooligan Cylinder Kits
An 883 to 1200cc Hooligan cylinder kit for a Harley-Davidson®, like the ones made by S&S Cycle, provides a significant increase in engine displacement, resulting in substantially more power and torque without requiring major engine modifications, making it a popular upgrade for riders seeking better performance on their Sportster 883, with benefits like increased horsepower—by boosting the engine size from 883cc to 1200cc, the Hooligan kit delivers a noticeable power gain, allowing for better acceleration and highway cruising capabilities. Typically these kits are designed as "bolt-on" upgrades, meaning they can be installed without needing extensive machining or engine rebalancing, making the process relatively simple and straightforward. Compared to a complete engine rebuild, a Hooligan kit is a cost-effective way to significantly improve your bike's power. When installing a Hooligan kit, it may be necessary to upgrade the clutch to handle the increased torque produced by the larger engine. Depending on the specific kit and your bike setup, you may need to adjust fuel injection mapping to optimize performance.
Not Yet Reviewed
$1,128.95
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$1,822.95
S&S Cycle 124 in. Hot Set-Up Cylinder Kits
S&S Cycle 124 in. (standard compression) Hot Set-Up cylinder kits package pistons and cylinders for use as replacements or as the basis for a new engine build. The pistons are a flat dome design, and the cylinders are machined with the stock bolt pattern intended for use in stock crankcases. Select the appropriate kit for your Big Twin. S&S cylinder and piston kit contents and notes: * S&S 4 1/8 in. bore cylinders -- Durable wrinkle black powdercoat finish * Forged flat domed pistons, rings, wrist pins * Head and base gaskets * Designed for 4 5/8 in. flywheels, resulting in 124 in. displacement * Cylinders can be used with stock or S&S cylinder heads with stock bolt pattern
Not Yet Reviewed
$1,643.95
S&S Cycle 4 in. Sidewinder Big Bore Kits
Inspired by S&S Pro Stock drag race engines, S&S Cycle 4 in. Sidewinder big bore kits utilize a ductile cast iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. These bolt-in kits do not require machining, re-balancing, or engine removal, and include just about everything you'll need to complete the installation. S&S Cycle 4 in. Sidewinder kits offer the biggest cylinder bore that can be installed in a stock crankcase without machining! Features: * Low-friction ductile cast iron liner * 10.5:1 compression * Bolts in with no machining, balancing, or splitting the crankcases * 88 in. engines are boosted to 100 in. * 96 in. and 103 in. engines are boosted to 110 in. * Complete kits include cylinders, pistons, gaskets, and instructions * Wrinkle black and silver cylinders that match stock finish
Not Yet Reviewed
$1,540.95
S&S Cycle 107 in. Big Bore Kits
S&S Cycle 107 in. big bore kits are easy to install and require no machining or re-balancing. These are the largest bores that can be fit in your stock engine case. This is the largest bore that can be fit in a stock engine case. Stock engine height is maintained so there are no manifold or frame fitment issues. Using an 11-fin design, the pre-finished cylinders closely resemble the OEM shape and are ready to install. Take your stock engine case as big as it'll go with S&S Cycle 107 in. big bore kits! Product features include: * CP pistons feature a 3cc pop-up dome for slightly higher compression * Cylinders feature an increased fin area for better heat dissipation * Centrifugal cast gray liner features 40,000 psi tensile strength for superior wear and performance
Not Yet Reviewed
$1,345.95
S&S Cycle M8 Big Bore Cylinders
S&S Cycle M8 big bore cylinders are bolt-on sets for Milwaukee 8 models. They are available in a Wrinkle Black finish with or without highlighted fins. Select the set you would like.
Not Yet Reviewed
$391.95
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$977.95
S&S Cycle M8 131 in. Big Bore Kits
S&S Cycle 131 in. big bore kits are aimed at the Milwaukee Eight platform for 2017 and newer big twins—and open up a whole new level of performance for these engines. When paired with an S&S 4.625 in. stroker flywheel (sold separately), engine will be a true 131cubic inches. S&S builds their big bore kits and cranks to much tighter tolerances and with higher quality materials than the factory parts. If you're the proud owner of a Harley-Davidson® Milwaukee Eight big twin and have been waiting for just the thing to boost your M8's power—the wait is over! The S&S Cycle piston/cylinder kits will be a solid platform for massive power! Features and benefits: * Huge displacement increase means huge power increase * Bolt-on kit works with stock crankcases * 4 1/4 in. bore cylinders with a new 11:1 forged piston design * Original engine serial numbers are retained * Powdercoat finish match factory finish, giving the bike a "sleeper" advantage * Includes .045 in. multi-layered steel head gaskets * Retains stock engine height * Includes 131 in. Cam Cover Badge * Available with or without highlighted fins Note: This kit must be used with S&S Cycle stroker flywheels to achieve 131 in. displacement (P/N: 320-0605, 320-0620).
Not Yet Reviewed
$1,559.95
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$1,643.95
S&S Cycle M8 124 in. Big Bore Kits
Inspired by S&S Pro Stock drag race engines, S&S Cycle 124 in. big bore kits utilize a ductile cast iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. These bolt-in kits do not require machining, re-balancing or engine removal, and include just about everything you'll need to complete the installation. S&S Cycle 124 in. big bore kits are available in wrinkle black or wrinkle black with highlighted finned cylinders. Transform your stock engine into a 124 in. monster with the installation of a 124 in. big bore kit from S&S Cycle! S&S Cycle 124 in. big bore kit features: * Available for 107 M8 models * 107 to 124 in. big bore kit * Bolt-on kit * Includes gaskets and hardware required for installation * 4.250 in. bore * Forged Pistons * 11:1 compression ratio
Not Yet Reviewed
$1,561.95
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$1,643.95
S&S Cycle 1200cc to 1250cc Hooligan Cylinder Kits
Whether you are looking for better acceleration for everyday riding or more power for spirited driving, S&S Cycle 1200cc to 1250cc Hooligan cylinder kits provide a noticeable improvement. The larger displacement from 1200cc to 1250cc directly translates to more power, making the bike faster and more responsive, especially noticeable in acceleration and mid-range torque. These kits are designed to be "bolt-on" meaning they can be installed without needing to machine the engine cases or rebalance the crankshaft, making the upgrade process fairly straightforward. Each kit is tailored with the necessary components for your specific HD® model. Most Hooligan kits utilize the existing stock heads, pushrods, and fuel system, minimizing the need for additional parts or adjustments. Compared to a full engine rebuild or custom build, S&S Cycle's Hooligan kits are a relatively affordable way to significantly improve performance. Select the kit designed for your application needs.
Not Yet Reviewed
$1,822.95
S&S Cycle 80 in. Shovelhead Top End Kits
Replace that worn out top end with S&S Cycle complete 80 in. top-end replacement kits for Big Twins with band-style heads. They include everything needed to totally replace the top end of your tired Shovelhead engine. The cylinder heads feature high-flowing ports and .590 in. lift capacity for improved performance and easy high-lift camshaft installation, while a moderate 8:1 compression ratio will allow your engine to run well on readily available premium pump gas. S&S Cycle 80 in. top-end kits contain S&S 3 1/2 in. bore high-tensile cast iron cylinders, 3 1/2 in. bore forged pistons, Super Stock cylinder heads, and all the gaskets and hardware necessary.
Not Yet Reviewed
$3,659.95
S&S Cycle 1250cc Conversion Cylinder Kits
The S&S Cycle 1250cc conversion cylinder kits are suitable for a range of Harley-Davidson® models, including the Sportster, which can benefit significantly from the added power. These cylinder conversion kits provide a significant increase in engine power and torque compared to the stock engine, making the bike significantly faster with a more noticeable acceleration, especially on smaller models like the Sportster, while often being a relatively cost-effective upgrade that can be done without major engine modifications or requiring a complete engine rebuild. This is particularly beneficial for riders seeking more power without drastically changing their bike's character. Each kit is tailored with the necessary components for your specific bike model. Many 1250cc conversion kits are designed to be installed without requiring major engine modifications, making them a good option for DIY mechanics. In most cases, you can use your stock cylinder heads, cams, and other engine components with a 1250cc conversion kit. Select the kit designed specifically for your HD® model and engine to ensure proper fitment.
Not Yet Reviewed
$1,008.95
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$1,077.95
S&S Cycle 124 in. Power Packages with Chain Drive Cam
The S&S Cycle 124 in. power packages with chain drive cam are the ideal combination of performance and savings to transform a Harley-Davidson® motorcycle without breaking the bank. Each kit is tailored with the necessary components for your specific HD® model. These kits offer significant benefits in terms of increased horsepower and torque, particularly noticeable in the mid-range and top-end of the rpm band, making for a more powerful and responsive riding experience, especially when paired with other performance upgrades like ported heads and high-flow exhaust systems. Many power packages allow for customization by choosing different cam profiles to tailor the power delivery to your riding style, whether you prioritize low-end torque or high-end horsepower. Most 124 in. power packages are designed as "bolt-on" kits, meaning they can be installed without requiring extensive engine machining, making the upgrade process relatively simple. Select the 124 in. power package kit with chain drive cam designed for your application.
Not Yet Reviewed
$2,915.99
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$3,265.95
S&S Cycle Hot Set-Up Twin Cam Cylinders
S&S Cycle Hot Set-Up Twin Cam cylinders are handsomely designed to house your pistons. They are crafted from aluminum, available in a silver, stone gray, or machined wrinkle black finish, and have a stock bolt pattern. Select the Hot Set-Up cylinders designed for your Big Twin engine. Please note: Individual cylinders and cylinder sets without pistons are bored slightly under normal size and are not honed.
Not Yet Reviewed
$924.95
S&S Cycle 93 in. Sidewinder Big Bore Stroker Kits
S&S Cycle offers 93 in. Sidewinder Big Bore Stroker kits for a variety of Harley-Davidson© street bikes from the 1970s and '80s. They're an economical route to a larger displacement engine. These kits contain nearly everything needed to take a stock 74 in. or 80 in. H-D© shovelhead engine up to 93 in. displacement. They include S&S 3 5/8 in. bore high tensile cast iron Sidewinder cylinders and forged pistons with wristpin and rings, a 4 1/2 in. stroke dynamically balanced S&S flywheel assembly, complete with S&S heavy-duty connecting rods and mainshafts, S&S stainless steel headbolts, base nut, S&S adjustable chromoly steel pushrods, head gaskets, base gaskets, exhaust gaskets, and an S&S heavy duty-top motor mount. Kits are available with 8.5:1 or 9.1:1 compression.
Not Yet Reviewed
$3,795.95
S&S Cycle M8 High Compression 132/136 in. Big Bore Kits
S&S Cycle M8 high-compression 132/136 in. Big Bore kits are high performance engine upgrades for 2017+ Harley-Davidson® Milwaukee-Eight engines, designed to maximize displacement without boring the engine case. They offer significant torque and horsepower gains using 4.320 in. bore cylinders, with the 132 in. kit designed for stock stroke, while 136 in. requires a stroker flywheel. Key details: * Performance: Drastically boosts horsepower and torque, offering a "thrilling" ride with improved throttle response * No case machining: Engineered to fit stock crankcases, avoiding expensive and time-consuming case boring * Components: Includes 4.320 in. bore cylinders, premium forged pistons, and gaskets * Compatibility: Fits 2017–25 Touring models and 2018–25 Softails * Factory appearance: Powdercoated finish matches stock engine finishes * 132 in. vs 136 in.: The 132 in. kit operates with the stock 4.5 in. stroke, while the 136 in. kit requires a 4.625 in. stroker flywheel to achieve maximum displacement. * These kits are intended for performance-oriented riders looking for a "bang for buck" upgrade, often requiring supporting modifications like high-flow exhaust, air cleaners, and dyno tuning to achieve best results.
Not Yet Reviewed
$1,849.95
S&S Cycle 124 in. Power Packages with Gear Drive Cam
S&S Cycle 124 in. power packages with gear drive cam are the ideal combination of performance and savings to transform a Harley-Davidson® motorcycle without breaking the bank. Each kit is tailored with the necessary components for your specific HD® model. These kits offer significant benefits, including a substantial increase in horsepower and torque across the powerband, improved throttle response, better cam timing accuracy due to the gear drive mechanism, and a more reliable valve train compared to a standard chain-driven cam, making it ideal for riders seeking a powerful and responsive engine upgrade, especially on larger displacement bikes like the Milwaukee-Eight models. Installing a 124 in. power package often necessitates additional tuning adjustments, including adjusting fuel delivery and ignition timing to optimize performance. Select the power package with gear drive cam designed specifically for your HD® model and engine to ensure proper fitment.
Not Yet Reviewed
$3,460.95
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$3,695.95
S&S Cycle 128 in. Power Packages with Gear Drive Cam
S&S Cycle offers 128 in. power packages with gear drive cam for a variety of Harley-Davidson© street bikes from 2017 and up. Kit details include: BIG BORE KIT: * 4.250 in. bore * Forged pistons * 11.1:1 compression ratio OIL PUMP/CAM PLATE: * Precision-machined from billet aluminum * Passage plugs removable for servicing * Independent scavenge sections for flywheel cavity and cam chest * Debris screens in both scavenge pickups * Magnet in cam chest to help stop debris from entering oil pump * Increased flow capacity on both feed and scavenge side * Pressure relief valve is adjustable with unit installed in engine * Kits now include updated oil pump with groove for optional OEM oil seal PUSHRODS: * Quickee pushrods with chrome covers TAPPETS: * Hand-assembled to exacting tolerances * Reduced valvetrain noise from start-up to shut-down * Close tolerances for low leak-down rates * Fast pump-up and superior high-RPM performance TAPPET CUFFS: * Hard anodized black coating * Billet aluminum construction * Stronger than stock material eliminates distortion * Improve tappet stability in high lift and high RPM situations CAM: * S&S 550 cam—designed for big bore applications * Gear drive kits provide improved cam timing accuracy and eliminate stock chain tensioner * Gear drive kits include outer drive gears VALVE SPRINGS: * Work well with cams up to .605 lift * High performance conical single-wire spring * Includes top collars, keepers, and valve seals/bottom collars
Not Yet Reviewed
$3,427.95
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$3,460.95
S&S Cycle 129 in. Power Packages with Chain Drive Cam
S&S Cycle offers 129 in. power packages with chain drive cam for a variety of Harley-Davidson© street bikes from 2017 and up. These packages are the ideal combination of performance and savings designed to transform your engine from mild to wild. They combine S&S's biggest big bore cylinders with matched 550 cam/cam-plate/oil pump and everything else a high performance cam chest needs to make big, reliable horsepower. Transform your 107 in. into a 129 in. monster. Additional details: * Available with 129 in. Big Bore pistons/cylinders * 550 lift cam for the perfect combination of horsepower and torque * Works with stock crankcases * Powdercoat finish matched to factory * MLS (multi-layered steel) head gaskets * Includes tappets, tappet cuffs, and high lift springs * Includes 129 cam cover badge
Not Yet Reviewed
$3,359.95
S&S Cycle M8 Flywheel Assemblies
Crankshafts are the heart of any performance engine. S&S Cycle M8 flywheel assemblies are stronger, more durable, and trued to a spec others can only dream of. These cranks for the Milwaukee-Eight platform are the best of the best to build your high performance engine around. Available in different strokes with tapered rods or full wrist pin rods, select the M8 flywheel assembly needed for your motorcycle's engine. Features and benefits: * Available in 4 3/8, 4 1/2, and 4 5/8 in. stroke * Comes with balance gear installed for easier installation * Heat-treated 4140 material is harder and more than twice as strong as stock * Stronger assembly eliminates need to weld crankpin * S&S high-strength forged connecting rods are designed with Finite Element Analysis to eliminate weak spots and handle more power * Full width connecting rods have more material to handle higher stress * Perfect for gear drive camshafts * Consistent balance and precision machining * Capable of higher rpm--more available power
Not Yet Reviewed
$1,995.95
S&S Cycle T117 Cylinder Kits
S&S Cycle's T117 cylinder kits are an exceptional choice for riders who choose to re-work their bikes for more power. This 4 1/8 in. bore cylinder and piston kit replaces the cylinders and pistons on early production S&S T117 engines for 1999-2006 Big Twins. With top-of-the-line components, these S&S Cycle T117 cylinder kits contain the following: S&S 4 1/8 in. bore cylinders, forged pistons, rings, wrist pins, head and base gaskets. Pistons are flat topped design intended for use with S&S Super Stock cylinder heads. The cylinders are machined with the S&S bolt pattern and are intended for use in S&S crankcases used in early S&S T117 engines. Designed for 4 3/8 in. stroke flywheels, resulting in 117 in. displacement. For best performance expectations, appropriate camshafts, performance air cleaner, performance exhaust and fuel system tuning are required.
Not Yet Reviewed
$1,750.95
S&S Cycle 96 in. Sidewinder Big Bore Stroker Kits
S&S Cycle offers 96 in. Sidewinder Big Bore Stroker kits for a variety of Harley-Davidson© street bikes from 1970 and up. They're an economical route to a larger displacement engine. These kits contain nearly everything needed to take a stock 80 in. Harley-Davidson© Evolution Big Twin engine up to 96 in. displacement. They include S&S 3-5/8 in. bore aluminum Sidewinder cylinders and forged pistons, a 4 5/8 in. stroke dynamically balanced S&S flywheel assembly, complete with S&S heavy-duty connecting rods and mainshafts, head gaskets, base gaskets, and exhaust gaskets. Stock cases will need to be bored out to 3 5/8 in. Cylinders are available in a natural, gloss black, or wrinkle black finish.
Not Yet Reviewed
$2,879.95
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$4,499.95
S&S Cycle 117 in. Big Bore Kits
S&S Cycle 117 in. big bore kits are a popular choice for riders looking to upgrade their engine power without major modifications. Available for a variety of Harley-Davidson® motorcycles, each kit is tailored with the necessary components for your specific HD® model. Many kits come with a powdercoat finish that can match the stock engine look to maintain a clean aesthetic. Using one of S&S Cycle's big bore kits can provide significant benefits like a noticeable increase in horsepower and torque due to the larger engine displacement, relatively easy installation with minimal machine work required, a quality build with durable components, and a good balance of performance and reliability. For best performance, appropriate camshafts, performance air cleaner, performance exhaust and fuel system tuning are required. Although not mandatory, S&S Cycle recommends adding an oil cooler to bikes ridden in warmer climates. Select the S&S Cycle big bore kit designed for your application needs.
Not Yet Reviewed
$1,643.95
S&S Cycle 93 in. Big Bore Cylinder Kits
S&S Cycle's 93 in. big bore cylinder kits can provide significant benefits by increasing engine displacement, resulting in noticeable gains in horsepower and torque, particularly in the low to mid-range powerband, making for a more powerful and responsive ride with improved acceleration, while often being considered a relatively easy bolt-on upgrade that doesn't require major engine modifications. The larger cylinder bore allows for more air and fuel to be ingested during each combustion cycle, leading to a substantial increase in horsepower and torque. With more power available, the motorcycle will accelerate quicker and more readily, especially in everyday riding situations. While there may be a slight decrease in fuel efficiency due to the increased displacement, it is often negligible compared to the performance gains. To maximize the benefits of a big bore kit, it is often recommended to upgrade other engine components like the camshaft and intake system to optimize airflow and further enhance performance. Depending on the specific big bore cylinder kit and your bike's engine configuration, proper tuning with a power commander or similar device may be necessary to ensure the engine runs efficiently with the increased displacement.
Not Yet Reviewed
$1,995.95
S&S Cycle Twin Cam Cylinders
Boost your engine's performance with S&S Cycle's Twin Cam cylinders. The design, finish and workmanship of these cylinder replacements feature many improvements over stock units, including sturdier walls that are far less prone to warpage. Straighter, sturdier walls equals a better seal, and fit for pistons, and piston rings. An improved machining process also ensures a better surface for both the head and base gaskets. These cylinders feature ductile cast-iron sleeves in aluminum castings and are offered in silver and black wrinkle finish. Select the cylinders designed to fit your specific HD® model.
Not Yet Reviewed
$510.95
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$1,450.95
