Engine

Engine parts are where a bagger gets its character. This page lists the engine product type for Harley-Davidson and Indian models, and the year and model bar filters it by bike. It is mostly valve train, oiling and rebuild parts, rather than complete kits.

Who supplies what

KPMI is the largest supplier, with valves, guides, seats and spring kits. Harddrive adds covers, hardware and chrome engine parts. Feuling supplies HP+ oil pumps, oiling kits, pushrods and stud kits for Twin Cam. Rocket Performance Garage, JAGG and Ultracool fill out the list with additional engine accessories, alongside TTS, Rocker Lockers and Koso.

The upgrade ladder

• Stage 1: air cleaner, exhaust and a tune
• Stage 2: Stage 1 plus a camshaft change, often with new pushrods or lifters
• Big bore: bigger cylinders and pistons for more displacement, each needing a matching tune
• Heads and top-end work, for riders chasing more flow

Fitment and planning

Twin Cam and Milwaukee-Eight engines use different parts, and the Milwaukee-Eight has multiple displacements. Confirm your engine and model year, and check which parts go together. Browse piston kits, KPMI and Feuling for more detail, and tuners for the tune. Engine parts are sold for off-road and closed-course use only.