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She's gone from blow to suck... 200 1986

Well, today at noon, I started the 245, and I see I was wrong in my initial diagnosis..

There is not pressure buildup in the crankcase, but vaccuum.

There is a fairly strong vaccum at the oil filler cap and the dipstick.

So I guess my flametrap area must be free of debris and I can rule that out.

Now, what is the common cause of crankcase vaccum?? bad rings? or what?

(hint: I really do not want to have to rebuild my engine)








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