Connecting rod

I know there is no such thing as a dumb question.....but i'm going to give it my best shot here... Can you rebuild the crankshaft assembly?, more specific the connecting rod bearing? Owners manual doesnt cover this one.

Yes, crankshafts can be rebuilt. You can order a connecting rod kit either from Yamaha, Hot Rods, or Wiseco (among others). The work requires some special tools, so it's beyond the scope of what you can do in your garage, but most shops can do it. When I rebuilt my 426, it was very nearly a push on cost to just buy a new crank vs the cost of a rod kit and the labor to rebuild, but that might be changing...

The rod doesn't always need replacement, but in your case, it probably does. Yamaha doesn't sell a kit, though, so you need the rod, bearing and crank pin, and like Birdy said, you end up with the same money spent on the rebuild as wit a new crank, and the new crank will be all new, including the cam drive sprocket.

why are the yz450f crank assemblies so much cheaper than the 426? Would it really be cheaper to spend 500.00 on a new assembly vs rebuild, thats more than I spent for the bike.

why are the yz450f crank assemblies so much cheaper than the 426? Would it really be cheaper to spend 500.00 on a new assembly vs rebuild, thats more than I spent for the bike.
Price it out. A rebuild may be less on the 426. Parts for the obsolete lines tend to be higher, probably because they are no longer made in regular production.

Also, look into a Hot Rods brand replacement crank.

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