hello. my dad has a yamaha neos totally original. today i upjetted the carb from 60 to a 72 jet(on 12 carb) and changed the 8 gram rollers for 5 gram rollers. it seems to be running and accelerating slower. do i need to also add a sport air filter?? thankyou
Why did you change the rollers? If it's a stock bike it should have the stock weight of rollers and stock jet size?