Mine was geared down with a 39t axle sprocket and I was running a torque cam - It would hit about 30 mph and not much more. I had much more bottom end which allowed me to stop mid-hill with two people and go again as long as I could keep traction. These were my engine modifications:
6" intake plenum with 1.5" 2-stage UNI and Outerwears prefilter
3/8" fuel lines w/stock idle and 140 main jets
A12 torque cam
1" header w/ drilled Hammerhead sectional muffler
Red CDI, orange coil and NGK Iridium spark plug
12g slider weights in 115mm variator w/ red torque spring in clutch pulley
39t axle w/ stock 13t engine sprockets
22" tires on all four corners
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