4-stroke mufflers and spark arrestors

Discussion in 'Performance Mods' started by greenjon, Feb 28, 2018.

  1. greenjon

    greenjon Member

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    I'd like to know your experiences with mufflers and spark arrestors on 4-stroke bike engines. I'm not sure a muffler is required in my area, but the spark arrestor definitely is (it's practically all USNF here).

    Spark arrestor part numbers for Honda GXH50:
    18350-ZM7-801
    PCA-1151
     
    Last edited: Feb 28, 2018

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  2. CrazyDan

    CrazyDan Well-Known Member

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    Steel wool in a tin can is a spark arrestor, just don't pack it too much and leave many exit holes to not impede flow.
     
  3. greenjon

    greenjon Member

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    Thank you.
    Spark arrestors have to be a model approved by the USNF to be used in the USNF (at least in CA), so that will not be an option unfortunately.
     
    Last edited: Feb 28, 2018
  4. bakaneko

    bakaneko Active Member

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    the stock muffler seems good to me. some folks use the 2-stroke muffler and have decent results. i tried it and i cannot tell the difference. there are also the short and long performance mufflers. they also make the engine not sound like a lawn mower so that is that.

    hmm, affordable go karts don't have those mufflers anymore but im sure you can find it on eBay or a different vendor. here is a guy using a short race muffler I believe

     
  5. greenjon

    greenjon Member

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    By "the stock muffler" do you mean the little box muffler, or the one on a pipe that hangs between the frame and front wheel? I have seen the kind that hangs down fairly often, but my kit just has the little box muffler.
     
  6. bakaneko

    bakaneko Active Member

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    yeah, the little box is the stock muffler. the one you are referring to is probably the 2-stroke muffler that they sometimes include with the kits. i think they are about the same but i am not looking for optimal performance just functionality
     
  7. greenjon

    greenjon Member

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    Thanks @bakaneko. I'm glad to hear that I don't have to rig up a muffler, at least not right away. There's a spark arrestor that drops right into the stock muffler too.
     
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