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Discussion Starter #1
I installed a home made catch can on my yz400 oil blow by tube, since them theres been pressure buildup in the crank case, is that much blow by pressure normal? or do i need new rings or something. the top end is all original but im the original owner and i havent put that many hours on it, i dont think.

Thanks for any help
 

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Discussion Starter #4
Isnt that the exhausts job?

400cc in...400cc out.

.
Can you explain? sounds to me like 400cc intake/400cc exhast:hmmm:
Im refering to the blow by on top of the motor. Do catch cans have some sort of vent to relase the preasure?
 
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