Hey everyone my name is Peter and i need help. My bike is a 2009 zoombike and it has a ported outtake just wanted to throw that out there maybe that will help with my problem. Anyways my problem is that for some odd reason my bike wont go faster than 24mph with a 36t sprocket. I don't get it. Before i had a 44t and did 24-25mph! I think im running fuel ratio fine because i did a spark plug check and its black but dry. Thanks