When I got the engine kit. The shop sold this custom pulley for climbing hills. The shop had a retired engineer freind that couldn't ride up some hill in So. Calif. So he made this kit up. I got one and did the test without and with it on. The engine is still stock but it would climb hills when I riding it. He add on 7" sheave and the kit came with a new cover cut and sand down. I think shop is gone and just passing the info on.
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