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Latest Engine Reviews – You could win up to $500 for reviewing products!

  • Tusk Clutch Kit With Heavy Duty Springs

    Tusk Clutch Kit With Heavy Duty Springs

    Michael in GA

    Good replacement

    Installed the Tusk Clutch Kit with the heavy duty springs on my wife's xr100r after installing a big bore kit. The clutch has worked perfectly so far through the break in of the engine and a couple rides. The heavier springs did give the bike a little stiffer clutch pull but that's to be expected.

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  • Tusk Top End Gasket Kit

    Tusk Top End Gasket Kit

    DOUGLAS in SC

    I've been using tusk top end gaskets in all my bikes and atv's over the past 2 years. Good quality and comes with everything you need for half the price of other brands. Don't hesitate to order any tusk products. I guarantee you won't be disappointed.

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  • Wiseco Piston Kit

    Wiseco Piston Kit

    DOUGLAS in SC

    Best of the best

    Best piston on the market. Don't waste your time with other brands. Go with wiseco and you won't regret it

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  • Tusk Clutch Spring Set

    Tusk Clutch Spring Set

    Rajiv in FL

    good for price

    I bought this to replace spring on my Rm, however these are shorter and are stiffer. Im not sure how well it performs since I recently installed it. It was fairly cheap so its no issue if I choose to not use it anymore.

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  • Tusk 4-Stroke Oil Change Kit

    Tusk 4-Stroke Oil Change Kit

    Jayson in CA

    Function

    Love how it comes as a kit! easy to use and runs great in my bike!

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  • Steahly Heavy Flywheel Weight

    Steahly Heavy Flywheel Weight

    Jon in WA

    HELPER

    This made my sons KX85 more trail friendly. Is able to run the single track switch backs with ease.

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Dirt Bike Engine Parts

A dirt bike engine is an incredible piece of machinery, finely tuned for the rigors of off-road thrills. It keeps your motorcycle on the go in some of the roughest terrain, whether it’s the precision of a cleverly crafted motocross track or the raw appeal of nature’s finest trails. Your dirt bike’s engine is complex and intricate. A lot goes on in there, and it needs to be kept in the best shape possible in order to produce the results you’ve come to expect. When it’s time to look for dirt bike engine parts, you know you can turn to Rocky Mountain ATV/MC.

We carry a wide variety of motorcycle engine parts. If you only need a few replacement parts, we’ve got everything from crankshaft assemblies to piston kits to oil filters. If you want to upgrade your existing parts to improve your bike’s overall power or handling, we carry parts as varied as big bore kits, flywheels and individual shims. And since we’ve got the best prices around, you don’t need to feel worried about an overwhelming engine rebuild cost. In fact, you might be surprised at how affordable it can be to make some serious enhancements to your dirt bike’s engine!

We carry the names you’d expect for dirt bike engine parts: Wiseco, Athena, Cylinder Works, Rekluse, Pro X, Hot Cams, Vertex and more. (If you check out our section for OEM parts, you can find original stock replacements as well.) If you want to replace a few shot parts, you’re in the right place. If you want to rebuild your engine to be the best motocross engine or enduro engine it can be, you’ll find what you need here.

From the simplest piston circlip to the most advanced automatic clutch kit, we’ve got you covered for all of your dirt bike engine needs. So whether you’re in the process of a complete engine rebuild or just want the best motocross engine mods, you know that there’s nowhere better than Rocky Mountain ATV/MC!

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