Maybe in the sand or super steep hills but my experience has been anything lighter than a 12g roller or 14g slider the RPM's will be too high and a bunch of top end (speed) lost.My suggestion is that you do all your engine mods first. What you are doing when tuning the cvt the lighter the roller it is like downshifting your car into a lower gear. The difference is your car you can shift back up a gear the cvt you can't. The more power the engine has the heavier the roller you can run. In the beginning when my 150 had only an A12 cam jetted carb with a UNI and opened up exhaust the 12g rollers served me the best the 10g were too light.
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