mad rat
Hi there,try this, it might be the slipper clutch which is on the spur gear,it works like a clutch that stops the wheels wheelspinning but can also be to slack and cause no drive at all,check your instructions and it might tell you how to check and maintain the clutch,what we do is this,,remove the gear box cover and with yiour thumb whilst holding the rear wheels between your kness try and turn the large spur gear,if it turns easily without any resistance then tighten the clutch nut 1/4 turn and check again ,keep doing this until its doesn't slip ,do not over tighten or you will damage the gears,the idea of a clutch is to stop wheelspin when you hit the throttle and you should get around 2-3 feet of slip under full acceleration, if that doesn't work take the motor pinion off and see if the gearbox rotates freely and also the the motor rotates freely,hope this helps.
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