Sometimes motor height can be impeded by wiring that is getting in the way. For this reason, it is important to take notice of how your stock wiring is set up in the grip before taking the motor all the way out, because while a couple millimeters of incorrect motor height can produce the crazy noise you witnessed, it can also cause the top half of your pinion gear to be shredded due to lack of contact, especially if you have a pinion gear made out of softer metal (example: G&P).
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