zillakilla02 Posted June 1, 2015 Report Share Posted June 1, 2015 Has anyone ever seen these little holes on top of the intake blocks on a vitos 392 cub cylinder? I just found out my compression was 122 in left cyl and 90 psi in right cyl. It was running lean I'm wondering if this could be why?? They don't seem to go all the way thru almost like it's a casting flaw but pissin me off regardless! I'm trying to find the tools to do a leak down test not sure where to get a pump and attachments to screw into,the spark plug hole. Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted June 1, 2015 Report Share Posted June 1, 2015 Normal Edit: the holes are normal. The compression difference is not. Do as suggested and leak test. Quote Link to comment Share on other sites More sharing options...
zillakilla02 Posted June 1, 2015 Author Report Share Posted June 1, 2015 Ok good thanks Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted June 1, 2015 Report Share Posted June 1, 2015 What? Just plug the exhaust with rubber pvc caps, spark plugs in the head, pvc pipe and cap with gauge and valve in intakes. Quote Link to comment Share on other sites More sharing options...
Ynotsmith69 Posted June 1, 2015 Report Share Posted June 1, 2015 I have stock cylinders with those same holes and I bought new Athena cylinders with the exact same holes at least now I know its not just my cylinders either. Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted June 1, 2015 Report Share Posted June 1, 2015 Its where the intake bolt would come out if it was too long. Drill and tap them all the way through to save some weight! 1 Quote Link to comment Share on other sites More sharing options...
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