Making it very quiet?

Discussion in 'General Questions' started by Invisible, Apr 12, 2016.

  1. Invisible

    Invisible New Member

    Hi everyone I have a Chinese 80cc 2 stroke kit bought new off eBay.
    How can I make this thing sound very very quiet?
     

  2. Hello Moto!

    Hello Moto! Active Member

    I think that'd be cool too. There might be some type of silencer muffler that could possible be retrofitted somehow. I haven't seen any silencers made specifically for the motorized bicycle engine. You'd probably have to end up fabricating something yourself. It's a cool idea though!
     
  3. butre

    butre Well-Known Member

    you could build or retrofit a reverse flow muffler.
     
  4. troyg

    troyg Member

    Though it's been stated here 100's of times, you can address the output all you like, half the noise you hear is coming from the intake (2 stroke), if you can silence that without messing up the mix you're golden.Silencers/mufflers and such are easy peasy.
     
    Legwon likes this.
  5. bluegoatwoods

    bluegoatwoods Well-Known Member

    A poo pipe helps a lot. Especially if you're concerned about making the bike more quiet for yourself, as opposed to more quiet for people a few dozen feet away.

    At low rpms these bikes aren't really very noisy to the world around us. So if that's who you're trying to be quiet for, then a smaller drive sprocket could help. Just putt around at lower rpms.
     
  6. KCvale

    KCvale Motorized Bicycle Vendor

    This custom pipe
    Hi and welcome.
    First off, you have a 66cc engine, there is no such thing as an 80cc, Chinese marketing, don't worry about it.

    Muffling exhaust noise is all about catching the frequency of the noise in a pipe with the right size holes, and dampening it out into fiberglass. Hence the term 'Glass Pack' mufflers.

    On this 66cc 2-stoke build the exhaust starts with a Sick Bike Parts expansion chamber for a power boost, and I capped it off with a full size auto Glass Pack.

    [​IMG]

    Just kidding with that pic...
    That was made by a decade old forum friend for fun.

    It came out like this.

    [​IMG]

    If you want more on that say so as I am sure I have a topic about every detail of how I did it.

    The end result was rewarding, a much lower frequency muffled sound and it still hauled ass ;-}
     
  7. Randall

    Randall Member

    Phantom Bikes sell a end cap silencer in their parts section. It's for the longer pipes like what they sell, not the stock pipe though. :(
     
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