WR/YFZ interchangable?

So after searching forever I was wanting to clarify- is the WR motor out of a 2005 WR 450 the same as any YFZ 450 quad motor? I read some conflicting answers. I'm mostly curious about the cylinder/head/piston?? Thanks in advance :busted:

Use the microfiche to check part numbers on both and see if they match. It is a sure fire way to know rather than relying on someone's BS.

Here is a link to get you started


ya but problem there is even if the numbers dont match it doesnt mean they arent interchangable. Like the cylinder head for example. The numbers are different but I think its just because of the decomp plug is rubber in one and cast alum. in the other?

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