does anyone know what an Emulsion tube is. mine are apparently leaking, according to the mechanic as i didnt have the tools for a carby balance after my rebuild and it running like crap - high rpm for no reason, butterflys definately closed - verified with tank up. i thought at first it was a vacum leak but ive tightened everything to an inch of its life. then i thought the carbs are prolly out of balance from sitting around. i first gave them a bit of a once over with some carb spray on cleaner. after checking and rechecking, i eventually gave in and took it to a workshop to balance. the result i got back is they adjusted the carbs, but there not very far out, the emulsion tubes are leaking, and carbys require strip down and possible overhaul. anyone know or have any suggestions?