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1997 rm125 crankshaft replacement

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Hello, I have a 97 rm125 that needs a crankshaft. The threads are stripped on the magneto side of the shaft and the lower rod bearing is shot. So I can't just replace the rod and bearing. I bought a used 98 rm125 crank and the driven side of this crank is a quarter inch longer than the 97 crankshaft. Now are these cranks interchangeable if I buy the 98 driven gear? Everything on the cranks are the same except the length of output shaft.

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