Hello, Me and a buddy bought two 80cc bike kits. We put them together and his works great but mine is really slow. My bike starts fine, but if a turn the gas it just stalls. So I can only go about 10km per hour right now while he is zipping all around I tried my friends spark plug and still mine does not work right. I took apart the carb and it seems fine. I tried adjusting the needle with no effect. Tried running it with out the air filter on and still it has no power. Any advice? It just has no tork seem like it's some kind of air gas mixture problem. I use a 18 to 1 mixture for oil gas. My friend used the same gas and his is fine. Any ideas out there?