pocketbike expansion chamber

Discussion in 'Performance Mods' started by nadroj, Feb 4, 2009.

  1. nadroj

    nadroj Member

    I just put on an expansion chamber from an old pocketbike that my friend had at his house, all i needed to do was bend the exhaust a little and widen the holes a little. The increase in power is amazing, but it is quite loud now how can i quite it down? If you can put an expansion chamber on your bike i would. I have an 80cc motor
     

  2. I made a silencer out of 2" pvc pipe, 2 end caps, and a length of copper tubing with holes drilled in it. Very quiet........
     

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  3. oldschoolmotored

    oldschoolmotored New Member

    me too

    i have fitted a pocket bike chamber and muffler to mine recently and it has really worked well with the other mods,i will now attempt to post some blurry pics of it.
     

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