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Can you replace a crankcase cover with one from a different block?

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  • Can you replace a crankcase cover with one from a different block?

    Hey Guys,

    1987 Yamaha Pro50

    I noticed a leak of two stroke oil on the crank case cover (intake side). Wiped it off...and it came back. I bought the motor second hand. The guy had rebuilt it because it had locked up. I sanded down the paint in the area and can't see any cracks. I'm going to pull the front cover for closer inspection and I was looking at replacing it with a good cover but I've come to find through research there is some debate that case halves are/are not interchangeable due to them being line bored for a precision fit.

    Any insight on this? Has anyone thrown together different case halves with success?
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