Ban Jing Performance Quick Throttle in Silver for 50cc, 125cc and 150cc 2-Stroke and 4-Stroke Scooters and More! fits Many Makes and Models. This throttle has a larger internal post with a shorter stroke or "pull". This gives the rider less distance to twist the throttle and allows for a quicker throttle response. Please see our Warranty & Returns Policy. Increased Throttle Response All Machined and Polished Aluminum Construction Inner Diameter: 22.5mm Length: 5.5 inches For offroad/racing use