garelli with 21mm phbg, polini 70cc kit. i got it to start today for the first time with new kit, carb and exhaust and it idles like whoa. i read a whole crap load of posts here and im thinking its prob an air leak. i think i may have bent the metal "gasket" between the head and the jug. Im going to check it all tomorrow and tighten everything up. i was wondering if that metal gasket could be replaced with a regular rubber gasket or does it need to be that same metal ring. thanks, ben