I have been searching the posts for performance options, but so far I have not been able to get a straight answer on carburetors. What is the best carb for the powerking motor? I'm thinking the Mikuni 22mm available on ebay, pocketbike sites, etc., will be a good option. Anyone have any opinion yay or nay? Also if an expansion chamber is put onto the engine, will it have any effect on the carb choice?