hi, i have a v frame mounted huasheng 4 stroke 49cc engine kit on a mountain bike. and i bought it off a mate for $200 AUS. the only work it needs is a tune up, i gave it my best tune using the rich/ lean screw on the carby, its a lot better but it's still sluggish at takeoff and doesn't revv as hard as it should. all i need is the reset setting for that lean/rich fuel mixture screw on the carby, if you know the reset setting for that screw please let me know asap as i use this bike to get to and from school, thanks, josh! any help is appreciated