power issues

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...

Hello, I bought a kit used and it's fully installed but i'm still having issues getting it to run properly. The bike starts up very easily, only takes a couple pedals before I pop the clutch and it starts right up, however I have absolutely no power. If I engage the throttle at all the...