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Motorcycle Engine Kits

S&S Cycle offers engine kits for your Harley-Davidson® bit twin or Sportster® motorcycles. Increase your horsepower with these engine kits that increase your displacement and don't let sleeping hogs lie.

Step 3: 97" and 106" Big Bore Kit

— May 6, 2013

No need to bore or even split the cases, just do the cylinder and piston swap. In addition to the ease of installation, they look great because the cylinders are available with the same silver or wrinkle black powdercoat as stock, so they match the stock finish of your engine.

98" and 107" Big Bore Kits

— May 27, 2014

When it comes to big bore kits, the bigger the better. That’s the idea behind S&S Cycle’s new 98” and 107” bolt-in big bore kits.

Cylinder & Piston Conversion Kit for Sportster®

— May 9, 2013

Convert 883cc Harley-Davidson® Sportster® models to 1200cc

Sidewinder Big Bore Kit

— Aug 1, 2013

A 3-5/8" bore S&S Sidewinder® big bore kit is one of the most popular performance upgrades available for Harley-Davidson® Evolution® big twin and shovelhead engines.

1250cc Conversion Kits

— Feb 25, 2014

1250cc Conversion Kits for 1986-2014 1200cc Harley-Davidson® Sportster® Models

Stone Gray Products

— Jun 2, 2014

S&S Performance Solutions For 2007-Up CVO 110 Engines