Choose a vehicle:

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

» Log in to use your Rider Profile Machines

Please select make, model and year


Pistons from Rocky Mountain ATV/MC

Your best source for piston kits and big bore kits at discount prices.

Latest Dual Sport Pistons Reviews – You could win up to $500 for reviewing products!

  • Cylinder Works Standard Bore High Compression Replacement Vertex Piston Kit

    Cylinder Works Standard Bore High Compression Replacement Vertex Piston Kit

    Davin in Minnesota

    Try it!

    I put one of these in my buddy's 2006 CRF250R and wow what a change! His bike's engine was transformed. Although it was knocking on 91 octane. I believe it worked on 93 octane, but we switched to 110 shortly after install. After the success in his bike I decided to get one for my 2012 CRF250R when it was time for a new piston. I was skeptical as stock compression was 13:1 and this Vertex piston is 14:1. Im here to say these pistons really do make a huge difference. After the install I was very impressed with the power delivery. Feels a lot stronger all through the RPMs. Im not sure if 91 octane will work, I run 110. I have a loudmouth intake, stage 1 cam, CRFs only tune, and a Yoshimura exhaust to compliment this piston, It all works extremely well together. Piston even made my bike sound meaner. My brother is a KTM fan, he likes my engine better. His ideal bike would be the CRF engine with this Vertex piston in his KTM frame. I will continue to buy these pistons. It came with Cometic gaskets, which are also top of the line.

    Read All Reviews
  • Pro X Piston Kit

    Pro X Piston Kit

    Milton in FL

    Excellent Products

    Everything that this company makes is high quality made in Japan stuff and are more affordable than the hyped up companies outsourcing production to China. I have bought all kinds of engine parts from them(rods, valves, pistons, cam chains etc...) and never had one of those parts fail on me.

    Read All Reviews
  • Vertex Piston Kit Standard

    Vertex Piston Kit Standard

    josh in IN


    I only use these in my ktms. Same as OEM. Dealer will also tell you that. But $60 cheaper.

    Read All Reviews
  • Wiseco Piston Wristpin Bearing

    Wiseco Piston Wristpin Bearing

    Sebastian in NY

    Great Product

    High quality. Worked great!

    Read All Reviews
  • Wiseco Piston Kit

    Wiseco Piston Kit

    Lionel in UT

    Great piston

    Wiseco is all I use .

    Read All Reviews
  • Cylinder Works Big Bore Replacement Vertex Piston Kit

    Cylinder Works Big Bore Replacement Vertex Piston Kit

    Shawn in IA

    Cylinder works big bore kit.

    Awesome product zero problems

    Read All Reviews
RM Cash ProgramParts Finder