To give our customers the best shopping experience, our website uses cookies.  Learn More

dirt bike Engine

You are viewing a combination of machine-specific and universal parts. Please choose a machine to display parts specific to your machine or select a part below.

Choose a machine

User Tip: If you're unsure of your vehicle type, you may skip the machine type selection box.

Use one of my Saved Machines

Top 5 Motorcycle and ATV Clutch Maintenance Tips

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!

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

  • Vertex Piston Kit Standard

    Vertex Piston Kit Standard

    Cody in TX

    I've had good luck so far

    Vertex offers a cylinder specific size (A or B), and they're a supplier for some OEs. That was enough to convince me to give them a try. I've got about 20 hours on it so far, and it seems to be working great. I plan to get Vertex again for the next topend.

    Read All Reviews
  • Tusk Oil Filler Plug

    Tusk Oil Filler Plug

    Owen in BC

    Nice Plug

    Nice bit of bling added to the bike, fits perfect and no leaks. Seems to be putting up with my wrech bashing oil changes.

    Read All Reviews
  • Wiseco Piston Kit

    Wiseco Piston Kit

    Kevin in OH

    YZ 65 kit

    Noticeable difference in power and sound. The head gasket went on the bike and it lost compression, but I went ahead and did this while it was apart. Glad I did. Running better than new. Thanks

    Read All Reviews
  • Tusk Clutch Spring Set

    Tusk Clutch Spring Set

    adam in AB

    installed these is bike a year ago zero issues

    lost oem spring in shop, replaced all springs with tusk clutch springs, zero issues works great good feel at clutch lever

    Read All Reviews
  • Pro X Piston Kit

    Pro X Piston Kit

    adam in AB

    Oem japanese made pistons for great price

    used literally dozens of pro x pistons in 2 stroke and 4 stroke bikes with zero issues. if pro x makes a piston kit for your bike trust it, buy it.

    Read All Reviews
  • Pro X Valve Shim

    Pro X Valve Shim

    adam in AB

    high quality

    constantly topping up my shim kit with pro x shims, high quality zero issues bought dozens of them

    Read All Reviews
RM Cash ProgramParts Finder