2002 vs 2000 426

will a 2000 yz426 engine fit in a 2002 wr426.

what is the power difference between the two?

I'm pretty sure it will fit and the power difference will depend on how many mods were done to the WR engine. If it had the free mods and YZ timing with a freer flowing exhaust, I doubt the difference will be that noticable. WR Dave

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