How to Remove a Restricter From a Moped

Most mopeds are designed for convenience, not speed

Mopeds have become increasingly popular as concern about gas prices and the environment has increased. They are an economical option for short trips. Most manufacturers place one or more restricters on their mopeds to keep them from exceeding their safe, posted speeds. Be aware that if you remove any of these restricters, you likely will void your warranty and may be required to have a state motorcycle license when driving your moped.

Things You'll Need

• Screwdrivers, flat-head and Phillips head
• Wrench or ratchet set
• Metal sealant
• WD-40
• Cleaning rags
• Flashlight
• Large carburetor jet, compatible with moped
• Performance exhaust, compatible with moped

Instructions

Removing variator restricters

1. Remove the cover from the left side of your moped. Some models have a gasket underneath. Remove this if you have one and put it in a clean, safe place.

2. Use a wrench to remove the variator on the left. Examine it for a washer between the two halves of the pulley. The washer is a speed restricter.

3. Remove the washer and reassemble the variator. Use a sealant on the bolt when you replace the variator.

Replacing carburetor jets

1. Disconnect the throttle cable, gas line, air filter and overflow tube from your engine. Remove the choke, which is usually connected with one screw.

2. Remove the carburetor. It will be filled with gas, so be careful where you place it. Open the carburetor by unscrewing it. Replace the jet in the middle with a larger-sized jet.

3. Close the carburetor. Replace the carburetor and choke. Reassemble the lines and cables. Take particular care to be sure that the throttle cable is properly aligned, by turning it until it is securely located in its channel.

Replacing exhaust

1. Inspect the muffler's interior, using a flashlight. Look for an obstacle, such as a washer, that narrows the diameter of the pipe.

2. Find a performance exhaust pipe. A new pipe will cost about $80 to $200. Unless you have welding tools and experience using them, it is unlikely that you will be able to remove any restrictions in your exhaust system, and a new, unrestricted exhaust pipe is your best option.

3. Remove the exhaust pipe and replace it with the performance exhaust, making sure that all gaskets and flanges fit tightly.

Tips & Warnings

• Use the WD-40 and rags to clean parts as you remove and replace them.

References

• Scoot 'n Fast: Moped Modifications
• Cool Scooters: De-restricting an Aprilia Scooter (Or Most Any Modern Scooter)
• Scooter Heads: Restricted 50cc scooters and exhausts