Anybody know?

Russell45

Member
Aug 19, 2012
32
2
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Put together my new KOR top end after replacing all the bottom end seals on my 88 motor. Leak tested airtight after Yamabonding the intake gasket, held 7PSI for 20 minutes. So that got me to wondering - anybody know how much pressure/vacuum is actually generated in the crankcase when she's running? I know from reading here 7psi test seems to work for these motors in real life, but I'm just curious if this is more or less what it'll see under load. Any ideas?