S&S Cycle Engine Kits & Rotating Assemblies Engines & Components

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 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

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$1,995.95

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

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$1,345.95

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

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.

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$682.95

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

S&S Cycle Flywheel Assemblies

Why put your bike engine back together with stock parts—when you can upgrade with one of the S&S Cycle flywheel assemblies? These 3-piece units are forged and heat-treated from 4140 steel, making them harder and stronger than stock. They're precision-machined to be truer (for less vibration), and are assembled with integral mainshafts and lightweight connecting rod forgings. Stock flywheels shift out of true under heavy loads; improve your motorcycle with an S&S Cycle flywheel assembly.

Not Yet Reviewed

$1,695.95

S&S Cycle 106 in. Big Bore Hot Set-Up Kits

S&S Cycle 106 in. Big Bore Hot Set-Up cylinder kits are easy to install. No machining or rebalancing is required, and the engine does not need to be removed from the chassis. With these kits, the resulting 106 in. engine has a compression ratio of 10:1, is stock height (no frame clearance problems), and a stock EFI throttle body will fit. Kits include: * 3.927 in. bore pistons, rings, wrist pins * Big bore cylinders finished in silver or wrinkle black powder coat * 585C chain drive Easy Start camshafts * Chromoly steel adjustable pushrods * High performance tappets * Gaskets

Not Yet Reviewed

$2,143.95

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 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

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$1,540.95