I have a 82 kz750 i just put the motor together my qestion is the vents in the vaulve cover is it ok to cap them off?i tapd the 4 holes and screwd studs in is this ok?

 

Welcome to the forums, El.
No expert on KZ's. Do the vents go to anything, or have any plumbing attached? Sometimes these acted as "pressure-relief" spots; I think they had some plastic plugs in them which would allow pressure to escape, if memory serves me. Be careful with a "hard" fix.

 

the holes go to each exhaust port the us version has breathers on the cover and the uk version has no breathers.

 

I am thinking cap those off unless the added velocity of the exhaust somehow aided the carbs with your cam timing

Welcome to KF.

 

i tapd the holes and and put bolts in i have searched the net and i havent found anything on doing this thank for your input

 

I would guess the holes are for the emissions controls. My 79 KZ 650 has them. I researched this and found that filling them is fine. I have a piece of tubing running between them so they cannot draw any air. Bike runs just fine that way.