I  just bought a 6 segima jet kit its been a while since I tune a Carb and it fine tunes it for you the kit has needel shims a few pilot jets and 4, or 5 main it just really give you a step by step and tells you why and what each of these things do and how to fine tune it. It was 40 bucks but I know now that I will be really close on tuning and my have to just change a main jet or ect not bad for money you learn a lot