October 10, 20196 yr Fast goes to full throttle with less turning of the throttle, slow takes more turning. Slower thottles are seen as more controllable as small movements on throttle are small movements on the carb.
October 10, 20196 yr Slow action throttle requires less force to overcome the return spring. Fast action throttle can be more ergonomic because the rider's wrist does not need to flex out of the ideal position as far. Changing from fast to slow can help new riders adapt more easily to a responsive motor. New riders sometimes buy a trials bike that is not the easiest to learn trials on and changing from fast to slow is much more economical than buying and selling bikes.
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