Premium Member estell Posted November 21, 2015 Premium Member Share Posted November 21, 2015 I've noticed some clean-looking photos of the exhaust outputs on many FJ09s on this forum. Mine is covered in sooty deposits. Any ideas of the cause?My bike has 5200 miles but have not yet done the throttle body sync. Could that be it? I'll be doing the sync in January. The only other thing I can think of is the ECU flash that was done at 700 miles. I doubt that is the cause but I can't think of a third option. 2015 red FJ-09: Cal Sci screen, Sargent seat, ECU flash, slider combo, cruise, Rizoma bars, Matts forks, JRi shock, slipper clutch Link to comment Share on other sites More sharing options...
docsimple Posted November 21, 2015 Share Posted November 21, 2015 Mine has that as well. I'm guessing some people are more religious about cleaning it. 2015 Red FJ 09 2013 WR250R - little boy blue - sold 2012 DL650 V Strom - sold 2007 FZ6 - sold 1986 FJ600 - sold Link to comment Share on other sites More sharing options...
chris618 Posted November 22, 2015 Share Posted November 22, 2015 Mine also has that and I assume it is due to the flash allowing more fuel through. Link to comment Share on other sites More sharing options...
GoldenPenguin Posted November 23, 2015 Share Posted November 23, 2015 Depending on where you got the flash done, they probably added some fueling to help smooth out the throttle problems. And the result is a little black stuff coming out of your exhaust. It should wash off just fine. It also means you're having fun because usually you don't get that much unless you're a little throttle heavy. Link to comment Share on other sites More sharing options...
root Posted November 23, 2015 Share Posted November 23, 2015 I get it on mine with no flash. Link to comment Share on other sites More sharing options...
beameer Posted November 29, 2015 Share Posted November 29, 2015 Hi guys I too have the sooty deposit but no ecu flash... I think it is just a bit of moisture and carbon from the catalytic converter which I'm sure collects a certain amount of moisture all be from combustion of just a little bit of rain or water that accesses via the exhaust pipe when on the side stand ,it is of no concern and just wipes off. Link to comment Share on other sites More sharing options...
xpress Posted November 29, 2015 Share Posted November 29, 2015 Mine does it too, stock ECU. I just wipe it away for photos or when I'm cleaning it. It's normal. Link to comment Share on other sites More sharing options...
checkereddemon Posted January 20, 2016 Share Posted January 20, 2016 Black, sooty deposits are generally indicative of a motor that is running too rich - those are unburned molecules collecting on the exhaust outlet. I bet if you were to either have the ECU fueling remapped, or installed an aftermarket exhaust, you would see that stuff disappear... -CD- 2015 Yamaha FJ-09: RaceTech Gold Valves, RaceTech Rear Spring, Arrow Full Exhaust - black with w/Carbon Fibre endcap, ECU Flash, Lowered 20mm front, 15 mm rear, Denali driving lights, Fenda Extenda, Tail Tidy, Corbin Seat, Madstad 22" Windshield, OEM heated grips, Woodcraft frame sliders, Grip Puppies, BadAss Cover (Large).... Link to comment Share on other sites More sharing options...
Premium Member wessie Posted January 20, 2016 Premium Member Share Posted January 20, 2016 Black, sooty deposits are generally indicative of a motor that is running too rich - those are unburned molecules collecting on the exhaust outlet. I bet if you were to either have the ECU fueling remapped, or installed an aftermarket exhaust, you would see that stuff disappear...or not - just like using a choke on a carbed model, the ECU will richen the mixture when the bike is cold leading to sooty deposits for a short period. Every bike I have owned did the same. This signature is left blank as the poster writes enough pretentious bollocks as it is. Link to comment Share on other sites More sharing options...
b12ty Posted January 20, 2016 Share Posted January 20, 2016 I've noticed more soot deposits after I disabled AIS ( air injection ). I have not made any fueling changes yet. Ty '05 Bandit 1200s ( Blue and White ) Bandit pic 2015 FJ-09 ( RED ) FJ-09 pic Link to comment Share on other sites More sharing options...
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