Hi, i wonder if anyone could help? i have an aerox 50cc 56 plate. it is all standard except i have a malossi mhr exhaust, it flys of the spot and shows alot of power, however when reaching around 20-30 mph, it seems to loose all of its power and i am full throttling and it is just staying constantly at 20 mph.. does anyone know the problem and anyone know how i could fix this?

clean the air filter , it may be blocked,

then clean the spark plug, it could be dirty..

1)check your clutch in the engine bag could be burnt out as i had that problem on my aerox100

2)change your rollers and jets as they might not be compatiable with the exhaust you have on