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

Crankshaft AssembliesCrankshaft Assemblies

ATV Crankshaft Assemblies

If you have a seized engine, or are looking to overhaul or rebuild your engine, don’t forget to replace your crankshaft. Crankshafts rarely break, but considering that they are such a major component of your bottom end, they can cause a lot of damage if they do. At Rocky Mountain ATV/MC, we carry durable, quality crankshafts to get your engine running strong again in no time.

We carry full crankshaft assembly kits and connecting rod kits that are built to OEM specifications and designed to meet or exceed OEM performance. Our kits from Hot Rods and Pro-X are designed to last the lifetime of your ATV when properly cared for.

If you would like a stock crankshaft instead, be sure to check out the OEM section of our website to get the original manufactured crankshaft and any additional accessories that you may need. Check out our selection of crankshaft and connecting rod kits for your ATV today!

Latest ATV Crankshaft Assemblies Reviews – You could win up to $500 for reviewing products!

  • Hot Rods Complete Crankshaft Assembly

    Hot Rods Complete Crankshaft Assembly

    Jeff in CA

    Great product and a good price

    I have used HotRods cranks in multiple bikes that I own or have owned over the years. They drop in perfectly and provide an excellent replacement to OEM with heavier duty product.I have these rods in both my 250f and my KX450f and am completely happy with the product.

    Read All Reviews
  • Hot Rods Bottom End Kit

    Hot Rods Bottom End Kit

    DANIEL in OR

    great kit, priced right

    I installed this in a blown 2001 yz250f. the 03 and up spec crank is a great upgrade for the weak 01-02 bottom ends. Bigger crank pin is far more durable. (you will need an 03 up flywheel and flywheel nut if you plan on dropping in an 01-02). This kit is great. measured runout was less than .001" and factory allows for up to .002". not bad for a mass produced crank from Taiwan. What's the difference between Taiwanese products and some made in China, Quality Control. Taiwan has good QC; China not so much. the components of this kit all are of high quality. rod stamped made in U.S.A., vertex gaskets, Taiwanese main bearings, and KSF (I think? cant remember) oil seals. the only beef I have with this kit is that the O-rings for the oiling sytem passage ways seemed thinner than OEM so I re-used the OEM ones as I thought they would seal better. had I known that before I would have ordered new OEM O-rings when I ordered this kit. (there's your notice would-be buyer) Overall a very high quality kit with no issues. So far, I have over ten hours on this kit and expect to get lots more. Hot rods kits are all high quality priced right! they are the only kits I will buy from now on.

    Read All Reviews
  • Hot Rods Complete Crankshaft Assembly  - Heavy Duty

    Hot Rods Complete Crankshaft Assembly - Heavy Duty

    JEROME in QC

    good cheap and simple

    good thing to put, brand new all at once...!

    Read All Reviews
  • Pro X Connecting Rod Kit

    Pro X Connecting Rod Kit

    NATHAN in MO

    TRX250R PRO-X ROD

    IF YOU HAVE A TRX250R AND NEED A NEW CONNECTING ROD AND LOWER ROD BEARING, THIS IS THE KIT THAT YOU WANT TO BUY. BEARING AND ROD ARE MADE OF HIGHER QUALITY STEEL THAN THE HOTROD'S KIT OR ANY OF THE EBAY BRANDS. THIS ROD AND BEARING IS MADE IN JAPAN, AND SUPPOSEDLY IN THE SAME FACTORY THAT PRODUCED THE OEM HONDA RODS BACK IN THE 80'S.

    Read All Reviews
  • Hot Rods Connecting Rod Kit - Heavy Duty

    Hot Rods Connecting Rod Kit - Heavy Duty

    Lucas in CO

    Good product

    You cant go wrong when buying a Hot Rods product. Just out of the box you can tell the quality of their work. Fit perfectly and is still running strong!

    Read All Reviews
  • Hot Rods Connecting Rod Kit

    Hot Rods Connecting Rod Kit

    AARON in WA

    Well Made Kit!

    this is a very good product. my rod lower end was getting loose so i ordered this kit. it even came in a very nice little plastic case, not a bag! all items need to replace the rod came with it, i did not have to order anything else from the dealer.

    Read All Reviews
Frequent Buyer ProgramParts Finder