Pit Bike Problems! Motorcycle moves forward while the motor is running on 1st and 2nd gears?

To make it quick and painless, your centrifugal clutch springs are shot. Most dirt bike shops wont touch those knock off bikes because parts are too hard to come by, and its a liability risk if the accidentally break something on one. The clutch will most likely have to be replaced....the good news is that a centrifugal clutch is a pretty easy fix. Usually just under the side cover, and it will probably be held on with one bolt (may be reverse threaded) and a woodruff key.