Put a thin flat head screwdriver between the 2 halves that the bolt goes through to sperad it apart a bit and it should come free.
As far as the bike pulling in gear, that is entirely the clutch adjustment. Google tt250 clutch adjustment and you will find a CSC write up on how to adjust the clutch
. Follow that and you should be golden. Most of the adjustment is done on the motor side, and the fine tuning should be done at the lever end.
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