My set up on my Yamaha Aerox is not powerful as it sout be.The cases are ported to the limit and polished.It runs bad and a lot of bogging can't get speed. Cylinder Top performance Due Plus tuned for 20+BHP. Exhaust Lazer X Pro Carb Delorto 21mm with 0.80 main jet. Variator Polini Speedcontrol 4.5g weights Cluch Polini for race 3 Crank Rito