hi guys, i have a wr400f with a FCR1 carb on so i bought an FCR2 carb to up grade it. BUT i bought the carb without knowing the difference btw honda and yamaha thinking both are the same 39mm. now i have a 40mm carb from a crf450 so i need help in suggestion whether can i still make it work on my bike.and will it cost my bike any performance lost? now i'm so troubled by it... bike bike current have the hot cam auto decomp but the engine is stock. thanks in advance.