All Products

Increased fin area for better heat dissipation. Increases bore size from 3.750" to 3.927". 4 3/8" stroke, 10:1 comp. w/ stock heads. Easy installation; no machining or rebalancing required. Forged coated pistons are compatible with stock or S&S Super Stock 79cc and 89cc heads. Kit includes S&S cylinders with gaskets, piston set with rings, top-end...

Bolt-on kit is the largest possible bore that does not require machining of the crankcases. Features 4 1/4" bore, 4.375" stroke, and 11:1 forged pistons. All necessary gaskets and hardware required for installation included. Made in the U.S.A. Note: Not recommended for Trike models.

The S&S Hot Setup kit for Twin Cams allows a Twin Cam owner to convert a stock engine to 124" using the stock crankcases. Includes S&S heads 91cc, 4.125" bore cylinders and forged 10.8:1 flattop pistons, S&S 4.625" stroke flywheel assembly, S&S 0.640" lift gear-drive Easy Start cams, tappets, S&S Quickee adjustable pushrods, roller rocker arms,...

Increases your 107" M-Eight engine to 124" with a bolt-on power package. Features 4-1/4" bore cylinders with 11:1 forged pistons, S&S oil pump/cam plate, premium tappets, quickee pushrods, and S&S 550 cams designed for big bore applications. Includes all necessary gaskets, bearings, and hardware.

Bolt-on kit, the largest cylinder bore possible without requiring machining of the crankcases. Features 4 1/4" bore, 4 1/2" stroke, and 11:1 forged pistons. All necessary gaskets and hardware required for installation included. Made in the U.S.A. Note: Not recommended for H-D FL Trike.

Big-bore bolt-on kit increases your 114"/117" with 4.5" stroke M-Eight to 128" with no case machining required. Features 4-1/4" bore cylinders with 11:1 forged pistons, S&S oil pump/cam plate with blue anodized finish, premium tappets, quickee pushrods, and S&S 550 cams designed for big bore applications. Includes all necessary gaskets, bearings,...

Bolt-on kit, works with the stock crankcases. 4 1/4" bore cylinders with a new 11:1 forged piston design. When paired with an S&S 4.625" stroker flywheel (sold separately), engine will be a true 131 cubic inches. Retains stock engine height. Kits include 0.045" MLS head gaskets, and 131" cam cover badge. Made in the U.S.A.

Big-bore bolt-on kit increases 114"/117" to 132" with no case machining required (4.5" stroke M-Eight). Includes big bore 4.32" cylinders, 11:1 forged pistons, S&S oil pump/cam plate with blue anodized finish, and S&S 550 cams. Features independent scavenge sections, debris screen, and magnet in cam chest. Includes Quickee pushrods with chrome...

MK45 Performance mufflers are the result of decades of riding and racing. Using both stainless steel and fiberglass packing, these mufflers create a deep, performance tone and improved horsepower. Fitted with chrome-plated billet end caps. Multi-layered acoustic packing provides consistent sound for the life of the muffler.

The S&S Hot Set Up kit for Twin Cams includes S&S 4.125" bore cylinders and forged pistons, rings, wrist pins, head and base gaskets. Pistons are a dished dome design intended for use with the stock cylinder heads. For use with 4.625" stroke flywheels for 124" displacement. Available in wrinkle black powdercoat finish. Made in the U.S.A.

Black ceramic finish with stripped-down styling and aggressive sound. Removable dB reducer.

Performance upgrade kit including 475 bolt-in camshaft and Dynojet PV-3 tuning module. PV-3 displays vehicle data in real time and is weather-resistant.

Bolt-on large displacement cylinder and piston kits. Includes cylinders, 11:1 forged pistons, and all necessary gaskets and hardware for installation. Made in the U.S.A.

Improved stability tensioner with larger diameter piston and tighter tolerance fit. Thicker pad for longer wear. Includes chain oiling feature.

Precision-machined from 6061 billet aluminum with a larger diameter piston and thicker pad for longer wear. Features direct chain oiling.

High performance camshaft kits for M-Eight engines. Includes required bearings, O-rings, and hardware.

Designed for carb installations where additional clearance is required between tank and air cleaner. Mounting hole pattern is identical to stock pattern on Tillotson, Bendix, and Keihin butterfly-type carbs. Measures 1 7/8" x 1. Includes O-ring.

Replacement components for S&S Super E and G series carburetors.

Complete camchest kits including oil pump, cam plate, pushrods, tappets, and tappet cuffs. Parts matched for superior quality and performance. Blue anodized billet aluminum pump and plate.

Direct replacement for the OEM compensator ramp. CNC machined from 9000 series steel to handle upgraded horsepower and torque. Heat-treated and powdercoated black for superior strength and corrosion resistance. Made in the U.S.A.

Includes 0.030" Micropore head gaskets and 0.014" Micropore base gaskets. Kits include two of each head, base and tapered exhaust gaskets and four cylinder dowel pins. Sold as a kit. Made in the U.S.A.

Allows for easy start by initially reducing crank compression. Saves starter and battery. Centrifugally retracts for normal engine operation.

High-quality component. Sold each.

Tapered stainless steel design. Sold each.

5/16"-18, 5/16"-24 x 1.910" zinc-plated steel exhaust stud. Sold each. Made in the U.S.A.