you may be on to something here! . Sometimes during a hard pull my chain will go slack and at times will skip a tooth. I can blip the gas while holding the brake and watch the chain go slack. This has been a problem for me since day one. At one time I thought it was axle flex so I added a third center bearing support. This cured the axle flex but not the skip. Only thing I can figure at this point is the motor twisting in the rubber mounting bushing. The motor is held in at 3 locations, two at the front with bushing and a third at the rear which doubles as the chain adjuster. The motor needs a fouth mounting point in the rear to control twist but this would cause loosing the ability for chain adjustments without a lot of adjustment to motor mounts Solid mounting the motor with more/ stronger mounts and an adjustable idler gear might do the trick!
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