anouther good tip to stop carby leaks in a sirio is use some super glue remove the carby ball and boot clean with some metholated sprits clean inside the carby boot and use a small flat screw driver put a tiny bit of super glue on it and wipe it in the grove on the craby main body ware the boot sits in the grove. dont go over boared just a thin even layer on it then replace the boot and ball link. I have found super glue works much better than rvt silcone sealent. Regards Jeremy.