I also have a couple I would like you to try. Since your 660 ran so strong last year, I'd like you impression of the 066 I did, and my Asian 440 BB, not piped, but not bad for a "standard" saw!
But to answer your question. Yes. Had to mill out the case.
So mock-up, tear down, split case, mill out case for 54mm piston to clear and reassemble case.
Will it be worth it? Maybe. We’ll find out.
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