The purpose of a rev limiter is to prevent a relatively small engine from burning out too quickly as well as to limit the top speed of scooters, preventing them from being classed as larger motorcycles. Your scooter's rev limiter prevents its engine from transferring all of its energy to the drive belt. It is located in your scooter's drive belt or variator system on the left side of the scooter. Removing the rev limiter allows all energy to transfer from the engine to the belt, increasing your scooter's overall top speed.
Unfasten the kickstart by loosening the bolt head of the pin that attaches the kickstart to the outside of your scooter's variator case. This will allow you to pull the pin and remove the kickstart.
Remove the outer face of the variator system. On most scooters, this faceplate is attached to the variator case with six bolts.
Disconnect the left pulley wheel in the variator system. The wheel has a single bolt through the centre that must be unscrewed with an air-powered impact wrench. If you do not have an impact wrench, you can hold the wheel in place with a strap wrench and attempt to remove the bolt with a standard socket wrench.
Extract the limiting washer from the variator system. The limiting washer is positioned around the front pulley wheel, and in most scooters it can be removed by hand or with a pair of needle-nose pliers.
Reconnect the left pulley wheel and replace the variator case faceplate.
Attach the kickstart to the outside of the variator.
- "Scooters, Automatic Transmission 50 to 250cc (Hayne's Automotive Repair Manual)"; John Haynes; 2006
- Removing the rev limiter from your scooter may require you to register your scooter as a motorcycle.