How do you get more power from your 06 honda crf 80cc?

ive been riding mx since 06 i started on a honda 50 then my big sis quit riding and i got her 80 but ive been riding it for years and ive decided it isn't fast enough like u twist the throttle and the engine hesitates before going and i dont have the cash for a 150 yet and its to big for me to fit on... sugguestions?