Those 12g. sliders are equivalent to 10g. rollers. You should have good climbing ability but other than that a lack there of. Have you checked valve adjustment and compression PSI. These engines are designed for scooters 100 lbs. wet, driving one wheel vs your 400 lb. buggy pulling much larger wheels with a 20 lb. axle. So peak power is a necessity before even tuning the CVT.
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