WR450F #2 breakdown

My friend's 450 went down again. Just got it out of the shop. It has 23 miles on it. They are saying that the fit between the magneto and the crank shaft taper is wrong. Mechanic friend says that the machining tolerance is likely wrong. He is suspisious that it has something to do with the heavier fly wheel weight. Darn it! Glad I don't have one yet.

Hoss

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