4-stroke mufflers and spark arrestors

greenjon

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Feb 17, 2018
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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
 
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CrazyDan

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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.
 

greenjon

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Feb 17, 2018
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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.
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.
 
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bakaneko

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Nov 16, 2015
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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

 

greenjon

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the stock muffler seems good to me.
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.
 

bakaneko

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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
 

greenjon

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Feb 17, 2018
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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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