okay im on my gk76a H reg and it will splutter at certain revs.i am sure its not the o-rings because my carbs dont leak.im geussing i need a carb balence or just clean my jets?

while you have them off and in bits you are better off doing it all mate i have made that slip and ended up having to take them off and on and off and on, just bacause they aint leaking dont mean they dont need doing also take a look at tony sleeps great carburettor saga (google it ) it will help you out no end.

Mine did exactly the same and spluttered when I tried to rev the bike. Ended up re-building the carbs.
There are plenty of guys on here that can supply all the parts.