Spark arrestor - Honda CRF1000L Africa Twin Forum
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post #1 of 11 (permalink) Old 02-18-2017, 11:22 PM Thread Starter
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Spark arrestor

Does the OEM exhaust include a spark arrestor, and is it stamped "US FS Approved"? And if not, do any of the aftermarket mufflers have these features? I'd like to ride at an ORV park that requires the stamp.
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post #2 of 11 (permalink) Old 02-19-2017, 01:55 AM
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I know that the OEM muffler has a spark arrestor, but I don't know about the stamp. I'm not in a position to check right now but I will when I get a chance.
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post #3 of 11 (permalink) Old 03-04-2017, 06:50 PM Thread Starter
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My AT won't arrive until April, so I haven't seen the exhaust yet. Are the OEM systems stamped with U.S. Forestry approval on the muffler?
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post #4 of 11 (permalink) Old 03-04-2017, 09:55 PM
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Is it safe to remove the Spark Arresters? I was playing with ways to make the stock exhaust louder and with them removed it sounds awesome! They bolt on and off easily
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post #5 of 11 (permalink) Old 05-11-2017, 12:15 PM
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Is it safe to remove the Spark Arresters? I was playing with ways to make the stock exhaust louder and with them removed it sounds awesome! They bolt on and off easily
You can legally remove it, but if you are in an area that requires one, the fines can be hefty and/or law enforcement may impound your bike.

Best to check local laws before you do it.
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post #6 of 11 (permalink) Old 05-12-2017, 11:03 AM
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Removal and cleaning of Spark Arrester is in owners manual.
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post #7 of 11 (permalink) Old 05-12-2017, 05:33 PM
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Removal and cleaning of Spark Arrester is in owners manual.
Right, I saw that, but I was leaving them out, and riding with them out for long periods of time.
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post #8 of 11 (permalink) Old 05-12-2017, 05:52 PM Thread Starter
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Is it safe to remove the Spark Arresters? I was playing with ways to make the stock exhaust louder and with them removed it sounds awesome! They bolt on and off easily
Since these bikes are tuned to meet Euro 4 specs, they are injected on the lean side. Removing the spark arrestors will make it leaner still. One way to find out if it is too lean is to ride it and be aware of any lean surging or back popping during deceleration. But the better way is to check it with an exhaust analyzer and get an actual reading of the fuel/air ratio with the arrestors out.
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post #9 of 11 (permalink) Old 05-12-2017, 06:23 PM
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The manual warns not to run with the spark arrestors out or damage will occur. Not sure what kind of damage it's referring to? Either the spark arrestors hold the rest of the muffler together, or the engine will be damaged by running lean. Or something else, who knows?
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post #10 of 11 (permalink) Old 05-12-2017, 07:14 PM
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Funny, the AT is the first bike I have ever owned that sounds terrific with the stock muffler. It also runs better with the stocker than with the $560 Remus Okami carbon fibre can I bought. I agree, it is borderline too lean stock, and a more free flowing exhaust might sound different (it does, but not better), but it just makes the lean condition worse.

I put my stocker back on after a week.
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