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There are only two pulleys, one is for twin cylinder motors, other is for V-4 motors. Twin is the larger one of the two. It is used with a top flange to keep the belt on.
Don’t pay the absurd price for a belt from OMC/BRP. Go here instead: http://shop.polybelt.com/255L037-Black- … egoryId=-1
To bench test a generator:
1. Ground the field terminal (the small one) to the case.
2. Connect a jumper wire from a 12V battery neg (-) to the gen case. Use at least a 16 GA wire
3. Connect another jumper wire from pos (+) to the armature terminal on the gen (large one) Use at least 16 GA
Generator should run slowly like a motor. This proves that generator is working right now. It doesn’t prove it isn’t worn out and may conk out tomorrow. An inspection is required for that.