I have done a test, running down a hill, turned the key off (and locked the steering! not reccomented). there is quite a difference in deceleration with open and closed throttle, more breaking with closed throttle. I also did it with a 2 stroke bike, it behaves exactly the opporsite! which makes me think it may be possible to make a 2 stroke more efficient at low throttle openings than a 4 stroke.....
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