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

  • Kawasaki Generator Case Gasket

    Kawasaki Generator Case Gasket

    ALEXANDER in OR

    Exactly what it says

    OEM quality replacement

    Read All Reviews
  • Hot Cams Valve Shim Kit

    Hot Cams Valve Shim Kit

    Doug in WA

    Maybe a lifetime supply

    Well, my dealer's mechanic said these valves don't really go out of spec like the old tappets do. And he was right, so I have a full box haven't used one yet, but I didn't want any down time so ordered the kit ahead of time. The RMATV video on adjusting KTM valves is really good and is what made me decide this was definitely within my wrenching comfort zone. One trick, if you can't get a reading off of your current shims because you are using calipers that are too hard to get a good reading, you can use one of the hot cams shims with a known spec into your calipers, then use your old shim and a feeler gauge and you can subtract and get the spec of the current shim. As one reviewer noted, you really need a micrometer to measure the shims.

    Read All Reviews
  • Tusk Oil Filter

    Tusk Oil Filter

    Blake in SD

    Great Product

    If you want oil filters buy these half the cost of oem. Anything is better to save a few bucks. They fit like the original filters no need to force in. Its simple take the old one out and put a new one in.

    Read All Reviews
  • Tusk Reusable Oil Filter

    Tusk Reusable Oil Filter

    Darcy in VIC

    A must buy!

    Really convenient as they're easy to clean, way better than all brands i've tried!

    Read All Reviews
  • K & N Oil Filter

    K & N Oil Filter

    Scott in CA

    Great filter and easy to clean

    It's a K&N filter. Not much else needs to be said...

    Read All Reviews
  • Tusk Engine Oil Seal Kit

    Tusk Engine Oil Seal Kit

    Stephen in NV

    Do the job.

    Kits ok. I prefer the OEM crank seals over the ones in the kit. Had one fail. Rest seem to be holding up fine.

    Read All Reviews

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!

Frequent Buyer ProgramParts Finder