showtz

Black Exhaust soot on fender

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My XR has the same thing because it is set up a bit rich. More than likely that is what yours is from as well. 

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What’s causing this black exhaust soot on rear fender?
DR350 w/ pumper carb setup by keintech, dg exhaust, 3x3 airbox.
IMG_1238.thumb.JPG.802fdeac9eb77f38c75c998bc45f6ddb.JPG
 
 

Carbon.

Result typically from combustion temps being too low from overly right mixture, or water leaks to combustion chamber.

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I guess the real debate is weather or not its an issue.  In my experience pumper carbs are rich running beasties. If your bike runs well then I wouldn't be overly concerned.  If you want to "fix" the issue then get an wideband O2 sensor bung welded into your exhaust (or use an up the pipe type sensor) and set up for an O2 gauge. you can then play with the jetting to see how your bike is running.  I use an innovate MTX wideband gauge when I'm checking jetting on My KLX405r (pumper carb).  It still runs reasonably rich (down to 13.2:1) in some spots under load.  Or fit fuel injection as I have on my DRZ400SM - that has a innovate LC-2 installed permanently so the ECU knows what's going on.

 

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I guess the real debate is weather or not its an issue.  In my experience pumper carbs are rich running beasties. If your bike runs well then I wouldn't be overly concerned.

 

Bike runs perfect. Pumper carb made it much more enjoyable to ride.

Should I check for carbon buildup in the header? I don’t put many miles on it so I’ll prob just leave it.

 

roleyrev - I’ve been following your drz fuel injection. Great work! Hopefully Suzuki sees it.

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