its a 50cc speedfight and its only got an exhaust no 70cc kit or nuffing on it yet do not put 80 or any where near 110 jus increase it buh 2 - 4 sizes that will be plenty, on my speedfight i have 100cc pm tunning 360 exhaust malossi 70cc bore kit and a 19mm race carb and i have an 80 main jet, so dont put an 80 in if its only the exhaust you have put on.
dave, November 2008