power issues

  1. L

    No air filter - too lean?

    Hey Everyone, I am constantly tinkering with my first build - I can't seem to get it to run quite right. I am running a YD100 engine with an NT carb mounted to a Mongoose dirt bike. I've recently done some modifications but now my bike runs TERRIBLY. Can't even crack 5 mph on flat ground and...
  2. R

    NEED HELP no top end!

    So i tried posting a thread and it disappeared because I didn't have an account, well I'm back and I will use copy and paste until it works. Its a lot to read but if u can help me It'd be great! So I'm having trouble with my 66/80cc China 2 stroke. I recently built a new bike because my frame...
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