How to Remove Moped Muffler Restrictors

Written by sam surgalski
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How to Remove Moped Muffler Restrictors
Modern-day mopeds often have up to five restrictors on them, resulting in limited acceleration speed, and horsepower. (Jerry Kobalenko/Photodisc/Getty Images)

Mopeds are quickly becoming one of the best ways to travel. Whether it's just around town, or across town, either way, you can get there on a moped. Unfortunately, due to state regulations, many mopeds are restricted in more ways than one. This can reduce acceleration, top speed and horsepower on your scooter. If you would like to make your moped both a quicker and a faster ride, you can remove these restrictions holding the engine back from its full potential. Learn how to remove them from the muffler.

Skill level:
Moderate

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Things you need

  • Vice
  • Metal file
  • Wrench
  • Sawsall
  • Hammer
  • Grinder
  • Nuts
  • Bolts

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Instructions

  1. 1

    Remove the nuts and bolts holding the exhaust pipe to the moped.

  2. 2

    Grind off the bolt heads holding the muffler flange to the muffler pipe. Grinding these off will reveal the actual bolt heads, which you will be able to remove with a wrench to separate the two muffler pieces.

  3. 3

    If there is a little pipe extending past your muffler pipe, cut it off using a sawsall. Be sure to leave about 1 inch of metal protruding from the side of the muffler--you will need this to crimp the muffler pipe closed. Note: Only certain moped companies include this little pipe. Do not mistake this little pipe for the main muffler.

  4. 4

    Cut off the now-exposed restrictor coming out of the flange part of the muffler. The restrictor will look like a little pipe coming out of the section that you just removed the bolts from. File any burrs on the pipe that you just cut off, and be sure to remove any metal chips inside the pipe before placing the mufflers back together.

  5. 5

    Place the 1 inch of metal protruding from the side of the flange into your vice, and crimp it closed. Take your hammer, and hammer the crimped metal to the side of the muffler. You may want to also take a grinder to smooth the whole crimp over.

  6. 6

    Place the flange and the main muffler pipe back together, and put your new nuts and bolts into the muffler. Replace the unrestricted muffler back onto your moped.

Tips and warnings

  • If you have some money, a much simpler way to bypass this process it to just buy a performance exhaust. These £32 aftermarket exhausts already have the restrictor washers gone, so there's no need to open or close any metal. All you need to do is attach the new exhaust to your moped.
  • Tampering with your moped goes against any warranty it might have on it; keep that in mind while you are taking apart your moped.

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