a big bore kit, to 80cc might work for you. From what I've read the scooter ought to be dependable at 80cc if you also get a good Kevlar belt also. A stock 50cc is only a little over 3 horsepower, extrapolating (and it doesn't really work this way, but) you might get 4.8 hp with everything tuned just right. The added torque though might get you up that hill which is what you want.
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