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Black exhaust tips - normal?


severdog

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Canadian "Mikey" said that I was burning oil when he rode behind me at NEXXT. I don't think that it was burning oil, as I haven't used an ounce.

...but I'm wondering if the ends of my exhausts are showing that the engine's not combusting 100%. I have the stock exhaust, and the ends (around the "mini-gun" holes) are black with soot/carbon.

Normal?

I replaced the plugs ~ 2000 miles ago.

thanks........

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He probably saw the "rich" mixture burning out, and probably when you were accelerating hard. I notticed that my tips were darker than most of those at the NEXXT. I think it may be the gas we have here in IL, but I also used the 93 octane. I switched to lower gas and the color on the tips is not so much pronounced....

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Both my 01 XX and my 02 did the same thing.

I have taken notice of other guys exhaust also...

If I wipe my finger inside my pipe, I get a tiny bit of soot on my finger.

I won't mention names, but I've done the 'finger' test on other guys bikes at nexxt and other places, and noticed that lots of other birds have the same.

I think if your bike is perfectly tuned, it doesn't do that...

Mac's bike, the inside of the pipes are clean... I think Jerry's were too, but I can't remember...

In any case... I wouldn't worry about it.

If I'm running rich... I still get GREAT gas mileage compared to others. (and that's with my 297#'s on the bike) SO I can't be too rich.

I think mostly its the cold starts that run rich. Once the bike warms up, I think its about right.

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