The clutch is not disengaging. The cluches come from the factory with something on them that causes them to stick together, since the clutch pak is high in the engine it's not in the oil unless the motor is running. Mine done it for the first 1200 miles. If you take it to the dealer they will just take it out clean the plates and soak them in oil. It will also stop on it's own if you just deal with it for a little while.