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Rocky Mountain ATV/MC.com has a complete inventory of motorcycle engine parts that are built to last and keep your engine performing at its best. We have fantastic prices on clutch kits, oil filters, engine valves, shim kits, valve stem seals and even engine tools that make any maintenance job fast and easy. The best thing about shopping for motorcycle parts at Rocky Mountain ATV/MC.com is our “Parts Finder” which pulls up the exact engine parts made for your motorcycles make, model and year. Once you shop at Rocky Mountain ATV/MC.com for motorcycle engine parts, you’ll never shop anywhere else.

Joshua in CA
Fit great, sealed the clutch over on my sons tc50 nicely.
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Travis in WY
This piston kit was exactly what I was looking for. It fit perfectly during the top-end rebuild and has performed exactly as it should. Ive always trusted Wiseco for pistons because the quality is consistently solid and they hold up great under abuse. Another great experience with this kit.
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ezra in VA
perfect for doing valves on my 2024 crf 250r. kit is really nice and easy to use!
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Travis in WY
I grabbed this Pro X piston kit for my top-end refresh and it worked out great. Everything came right in the box piston, rings, wrist pin, and circlips and the tolerances were spot-on. The fit and finish are top-tier, dropping right into the cylinder with smooth action and great compression once sealed up. Solid quality and zero issues definitely a go-to kit if you're rebuilding on a budget without sacrificing reliability.
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Cody in FL
Good product for the price. Seems to have held up.
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Travis in WY
I grabbed these Pro X valve shims to dial in the valve clearances on my rebuild, and they worked out great. The sizing was dead-accurate on the calipers, no burrs or rough edges, and they dropped right into the buckets without sticking. Made adjusting the valves straightforward and kept everything specced tight. Definitely keep a few of these sizes in the toolbox for routine maintenance.
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