Black smoke - Suzuki Volusia Forums : Intruder Volusia and Boulevard Forum
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post #1 of 6 (permalink) Old 08-05-2012, 03:18 PM Thread Starter
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Black smoke

Looking for some feedback

2009 C50 with GMan Stealth intake, Cobra FI2000 controller and Cobra Streetrod Slashdowns pipes. Bought in May 2011 with zero miles and have put 6500 on it so far. Pot settings are at Cobra recommendation of 3-4-4 and have been running the setup for about a year with no issues.

After a ride yesterday, a buddy told me that I was blowing black smoke whenever I accelerated - even on the freeway. He's never seen that from my bike before. The only changes are that I switched to synthetic oil at the last change (800 miles ago) and last month I ran some sea foam through because I was noticing it took a few more turns on the starter for the bike to start. Have run through several tanks of gas since then - bike kicks over fine.

First thought is running rich, but I haven't changed the pot settings. Getting close to needing a valve adjustment - could that be it?

Oh - and I've noticed that the fan doesn't kick in anymore. Not getting an idiot light and the radiator fluid level is OK. Weather has been mild, maybe that's it.

Any input would be appreciated. Thanks

2009 C50 (3/2011 - 3/2014)
2007 Street Glide (2/2014 -)
San Jose, Ca
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post #2 of 6 (permalink) Old 08-05-2012, 03:51 PM
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Black smoke= mixture issue

Blue smoke= oil in the combustion chamber

White smoke= water in the combustion chamber

Your black smoke is caused by too much fuel in the combustion chamber, the extra being released out the tailpipe. This can be caused by two thing: too much fuel, or too little air. Likely causes are (in order of how likely it is): a dirty air filter, the controller being set too rich (it may have been doing it the whole time but no one told you before), a vacuum leak, dirty/ sticking fuel injector, failing fuel pressure regulator, or a bad sensor giving bad info to the ECM.

Check your air filter, clean or replace as needed. Check for leaks/ cracked/ loose hoses in the intake system and engine breather system. If both are fine, dump some fuel injector cleaner into the tank. If none of these work, play with the controller settings. If the bike otherwise runs fine and is not throwing any codes, then the chances of it being something other than minor are, well, minor.

Last edited by DrBob; 08-05-2012 at 04:00 PM.
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post #3 of 6 (permalink) Old 08-05-2012, 03:55 PM
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I'm not too familiar with the fuel processor however, when I switched to full syth from conventional oil my fan didn't come on again until 3 years later when I was idling in summer traffic congested by construction. There will be those who disagree but it was and is my belief the synth oil is that much more efficient at lubricating and removing heat it helps keep the operating temp that much lower.

May I also offer, confirm your fuel settings, adjust your valves and see how things progress.

06 C50, Royal Purple full synth, K&N filter, 105000 kms (65 600 mi), NC shield & bags. MC sissy bar, pillion seat levelled, rear peg swap, reversed saddlebag mounts.

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post #4 of 6 (permalink) Old 08-05-2012, 05:24 PM
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My 06 M50 was running very rich on the highway.. On my Bully- I was advised to set the "trasition part throttle" a little higher (comes on later) I was finding that the bike while in cruise was thinking it was in part throttle (accellerate) mode (not full throttle- But accellerate). Of course not good while cruising.
I set the stage to delay coming in and that has vastly improved the sucking gas syndrome.
I do not know the processor you have but see if there's a setting similar and give it a try.
BTW I have VH Cruzers, Gman intake (K&N) and Bully processor , The DJ drive made the transition worse as throttle needs to be more during higher speed cruise

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dsmitty (08-05-2012)
post #5 of 6 (permalink) Old 08-05-2012, 06:42 PM
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ive read that synthitic will run cooler keeping motor temps down as much as 60 degrees
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post #6 of 6 (permalink) Old 08-06-2012, 01:18 PM
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Originally Posted by Briany View Post
ive read that synthitic will run cooler keeping motor temps down as much as 60 degrees
60 degrees!?

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