Big Twin Parts

Parts for Harley-Davidson's Big Twin engine family, the larger-displacement motors that power the Touring, Softail, Dyna and FXR chassis, as opposed to the smaller Sportster. This collection gathers the components that are sold by engine family rather than by model.

What "Big Twin" Means Here

Harley has built two separate engine lineages for most of its history. The Sportster is one. Everything else, from the Panhead and Shovelhead through the Evolution, Twin Cam and Milwaukee-Eight, is a Big Twin. When a manufacturer lists a part as fitting "'99-'23 Big Twin" or "Evo Big Twin," it is describing the motor, not the frame it sits in.

That is why this collection cuts across platforms. A clutch kit, an oil pump, a set of pushrods or a primary chain tensioner is engineered around the engine, so the same part number often covers a Dyna, a Softail and a Road King of the same era.

What You Will Find

Driveline: clutch kits and springs, throwout bearings, shift kits and linkage, belt drives and primary components from Baker Drivetrain, Barnett, Belt Drives Ltd and PSR.
Engine internals: big bore kits, pistons, oil pumps, cam bearings and chains, rocker shaft hardware and fastener kits from S&S Cycles, Feuling and Drag Specialties.
Fluids and gaskets: primary gasket kits from James Gasket, plus transmission and engine oils formulated for pre-Evolution and later Big Twin motors.
Contact points: grips, handlebars, risers, clamps and foot controls listed by engine family from Avon, ODI, Thrashin Supply, Burly Brand and Biltwell.

Shop By Bike Instead

If you know your platform, those collections are usually the faster route: Bagger & Touring, Softail '84-'17, M8 Softail '18-'26, Dyna, FXR and Shovelhead.

Before You Order

Big Twin covers a very wide span of years, and a part listed for a '48-'84 motor has nothing in common with one listed for '07 and up. Check the year range and model codes on the product page against your own bike before ordering.