i have a go .21 5 port and a go .28 6 port. and when i got both engines with my truggy the carbs were off both of them. my .28 has an os carb on it now because i didnt know i put the wrong carb on and it has no top end. and my .21 has an airleak somehwhere. could my .21 have my .28 carb on it causein an airleak some how?