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EXC 250 crankshaft

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I have a 91 250 EXC that is no longer bike its become a hotsaw. A picture of the hotsaw is attached. My problem is that the motor has begun to vibrate to the point of killing itself sometime. I have put a new and better pipe on sense this picture was taken. I believe the crankshaft is unbalanced or something along those lines. So I am wondering if anyone knows where I can get a new crankshaft that is for a 91(I have looked all over) or if I can drop a crankshaft from a newer(say a 2000 or so) EXC 250 into the 1991 case that I already have.  looking for thoughts and help thanks


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