Hi!
One fast question... about both marks on the rear wheel, the ones that help you align the wheel and the belt... must they be at the exact same position on both sides? ...........
There's mark's???
I'm not even cognitive of these lines/marks as they are of no meaning (to me).
I just shared my belt adjustment procedure here......
https://www.electricmotorcycleforum.com/boards/index.php?topic=9787.msg87263#newProper belt alignment/tension can be a trying process especially on your first attempt.
The problem is that the belt is only on one side (Left) and therefore the greater the belt tension, the greater the rotation of the axel/wheel (Clockwise). To compound it, the belt MUST be somewhat centered on the rear sheave (sprocket).
Further complicating the procedure, the belt will travel to the left in the sheave when the axle nut is thightened so needs to be setup to the right of center first.
Once the belt is properly aligned/tensioned, it fairly easy to make the nessecary adjustments for subsequent services.
I would like to see Zero &/or every other motorcycle manufacturer to have the belt side jack screw (bolt) drive the wheel away from the motor (add tension) and the opposite sides jack screw driving the axle/wheel back towards the motor to counter the axle rotation due to the belt tension.