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WR/YFZ interchangable?

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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:

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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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