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Off track a bit but a friend has a old Royal Enfield that has been completely gone through and only needs the carbs done, dual Amal's and he bought the rebuild kits years ago so I told him to buy new ones cuz it seems things have been improved like float needles etc. Ok the gaskets are ok but what should he replace? I assume a float needle for modern gas, one of the new floats, the O rings @ the air screw & throttle stop. Is that it? His kits are eight years old (that's when the bike was restored but not ridden) I would trash them all but he won't so all new rubber parts is the best I can get him to do!