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

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!

  • Tusk Clutch Cover Gasket

    Tusk Clutch Cover Gasket

    Christopher in MD

    Works for well made bikes.

    Don't buy if you have a garbage ktm they simply suck at everything. All other bikes I own this worked perfect. Sold all my KTMs they're over priced garbage.

    Read All Reviews
  • Wiseco Piston Kit

    Wiseco Piston Kit

    Dan in WI

    Excellent product to work with. Easy install and quality

    Read All Reviews
  • Pro X OEM Clutch Plate Set Friction

    Pro X OEM Clutch Plate Set Friction

    Dustin in MI

    Friction is key

    My bike was starting to have clutch slippage problems so i decided to replace the clutch. When i was installing the new ones i measured the thickness of the old ones compared to the new ones and measurement wise i was getting the same thickness, odd right? Still put the new ones in anyhow and the slip went away. Got a few rides on it and bike pulls like a beast.

    Read All Reviews
  • Pro X Valve Shim

    Pro X Valve Shim

    James in VA

    works as intended

    I am happy with RM, they had the sizes I needed and received the order ahead of schedule.

    Read All Reviews
  • Rekluse Core EXP Clutch 3.0

    Rekluse Core EXP Clutch 3.0

    Daniel in WA

    Dont know how I survived without it...

    Easy to install, takes riding a dirtbike to a whole new level. Wish I would of purchased one years ago. If you dont have one get one.

    Read All Reviews
  • Tusk Automatic Cam Chain Tensioner

    Tusk Automatic Cam Chain Tensioner

    larry in OH


    Great product at a great price. Highly recommended

    Read All Reviews
RM Cash ProgramParts Finder