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

  • Hot Rods Water Pump Repair Kit

    Hot Rods Water Pump Repair Kit

    Dan in WY

    Second kit had more instructions and assembly tool

    First kit had very little instructions, installed it and it started leaking within 2 hours. Second kit had full set of instructions and a plastic spacer for setting the mechanical seal, this one lasted 14 hours. All other seals and bearing in kit work and fit perfectly, will try an OEM mechanical seal next.

    Read All Reviews
  • Yamaha OEM Oil Filter

    Yamaha OEM Oil Filter

    Dan in WY

    What's recommended

    from the factory. Knowing it is the correct micron and dimensions over a cheaper filter is worth the extra money for a factory filter.

    Read All Reviews
  • Wiseco Piston Kit

    Wiseco Piston Kit

    Jeffrey in MD

    a work of Art

    Love these pistons, if you're a serious Racer going to Replace your Piston why buy a cheesy Cast OEM? THIS Piston & rings should last an Entire season as Long as you Use a High end 2 stroke oil, the Piston is Beautiful it is Truly a work of Art.

    Read All Reviews
  • Hot Cams Valve Shim Kit

    Hot Cams Valve Shim Kit

    Dillon in WV

    Valve shim kit

    Came with all the valve shim size needed to properly adjust the valves on many bike would recommend

    Read All Reviews
  • Hot Rods Counter Balancer Bearing Kit

    Hot Rods Counter Balancer Bearing Kit

    Josh in WV

    Good fit

    Good price and perfect fit.

    Read All Reviews
  • Tusk Flywheel Puller

    Tusk Flywheel Puller

    Dillon in WV

    Flywheel puller

    Fit the flywheel perfectly and pulled it off with ease

    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