S&S Motorcycle Parts & Accessories

When a Harley guy says he "built the motor," there's a good chance the parts came from S&S Cycle. S&S has been making V-twins faster since before most of us were born. Today it makes everything from a single pushrod to a complete crate engine: big bore kits, camshafts, cam chest kits, crankshafts, the Super E carburetor, Stealth air cleaners and full exhaust systems.
The catalog runs from Shovelheads to the latest Milwaukee-Eight, and a lot of it is made in Wisconsin. Whether you're freshening a tired Evo or building a 132" M8 bagger, it's all on this page. Building an engine has a lot of moving parts (literally), so if you've got questions about compression, cam choice or fitment, our rider support team can talk you through it.

The S&S Cycle story
George J. Smith and Stanley Stankos started the company in 1958 in Blue Island, Illinois. Their first product was high-performance pushrods for Harley-Davidsons. Soon after, George's wife Marjorie bought out Stankos, and the company became Smith & Smith, which is where the "S&S" comes from. In 1969 the company moved to Viola, Wisconsin, where it's still headquartered. Since then, S&S has built the X-Wedge engine, supplied the V-twin for the Morgan 3-Wheeler, and become the first motorcycle engine maker to offer pre-certified EPA-compliant engines.

Why riders run S&S:

• More than 60 years of building V-twin engines
• Hundreds of made-in-USA parts
• Complete engines and long blocks for builds and swaps
• Parts that are made to work together, so cams, heads and big bore kits are matched
• Support for vintage Harleys, from Shovelheads to Evos

More About S&S from Common Tread

• 106 Cubic Inches of Fury: S&S Cycle's Baby Stroker Kit
• Milwaukee-Eight S&S Cam Install for Harley Tourers
• Video: How to Build a 150-Horsepower Milwaukee-Eight in Your Own Garage