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Nelson24

98 yz 400f with a wr400 bottom end

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I picked up a YZ 400f and the bottom end needs a rebuild. I found a 99 wr400 bottom end with very low hours. Can I use my top end from my 98 YZ on the WR case? I know the piston kits are different. Not sure how compatible these are. Thanks guys.

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The piston kits are interchangeable.  Yamaha lists both engines as using the same piston, rings, clips, and pin, showing old part numbers for each.  The two lower ends/top ends are also interchangeable, and apart from the transmission gear set and the magneto assembly, they are almost completely identical.

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Thanks for the clarification! Do you recommend I swap anything from the yz 400 and put in the WR? The case and the crank are no good in the yz400. Everything else is there.

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