Bagger M8 Motor

Engine and cam chest parts for the Milwaukee-Eight touring bikes, 2017 and up. Everything from a cam and lifter refresh through to 143 cubic inch big bore kits and complete engines.

What Is Here

Cam chest. Short travel and twin cooled camchest kits, camshafts, cam kits, cam plates, cam chains and bearings, oil pumps and breather kits from Feuling.
Valvetrain. Lifters, rocker arms and valve springs - the M8's hydraulic lifters and rocker geometry are their own design and do not share parts with Twin Cam.
Displacement. Monster and power package big bore kits taking the 107 up through 129, 139 and 143 from S&S Cycles, plus MK-series engine cases and complete MK136 engines.
Forced induction. Trask Tornado turbo kits, including the Stage 2 Gen 2 for '23-'25 models.

Why This Collection Is Split By Motor

Bolt-on parts go by platform. Engine parts go by cam chest. Two Harleys can wear the same badge, the same year, and still take different cams, plates, tensioners and oil pumps because the motor inside them changed. That is why the store keeps a separate page for each engine generation instead of listing everything under one platform.

Two things narrow M8 fitment more than the year does. Displacement - the 107, 114 and 117 do not share every internal part. And cooling - oil cooled and Twin Cooled heads change what fits, and several camchest kits are sold in separate versions for each.

Before You Order

Displacement, cam chest generation and whether the motor has been apart before all decide what you need. The fitment list on each product page carries the manufacturer's exact year and model coverage - read it, and if you are building rather than repairing, work out the whole combination before buying the first piece. Performance claims belong to the manufacturer; what any part is worth depends on the rest of your build.