After picking up the minibike from the autozone my son started the bike up noticing that the engine is a lot more quiet. When he rode it it almost flipped him off because of the torque which took some getting used to haha. The next day he rode it to his friends house and came back and was working fine. However, on the third day when he tried to start it up it would not start without pulling the throttle at the same time. Next the motor wouldn't even idle on the start position without dying in 7 seconds but would still run if you chocked it quickly. Now whenever the throttle is pulled a disturbing rubbing sound occurs and it just shuts off immediately. We tinkered with the idle a bit but it still wont work. Could it be the clutch?