Exactly! I just posted on gear sets.
My Yerf was a rock crawler running 12g sliders, 2000 RPM torque spring, A12 torque cam, 13/40 gear set and 13/39 sprockets. Even with UNI and performance CDI and coil, it barely ran faster than 30 mph. Because of the gearing, the CVT belt did not have to be replaced for over six years due to aging and it still had over 2/3 of the original clutch pads. This little 150cc had no problems running in loose sand or hitting small dunes at 20-25 mph because of its setup.
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