Ive put about 2000 miles on the scoot since i got it, and ive had to change the rear spark plug twice now. This hard black stuff seems to accumulate on it(carbon mabee??) when it starts to get bad the bike back fires at low RPMs. I was told that the S&S(E) carbs came with one standard size jet that may be to big, does this sound right? any advice would be greatly appreciated
