so yesterday i went a picked up a 1999 powder special 600 and the guy had took it to cpi and they put in there 740 racing motor and there light weight bulk head and tunnel with a 156 track and i got it home and its starts up but only idles for like 5 sec so i cleaned the carbs and put new plugs same thing so i tested the spark and its a yellowish white color so could it be the stator going out please help