Right Muffler Spitting Flames - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 18 (permalink) Old 04-29-2017, 03:55 PM Thread Starter
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Right Muffler Spitting Flames

So rather recently it seems, my right side muffler will pop and spit a 3-4inch flame off with it, Usually it happens under moderate to heavy throttle to let off. I have heard that its because its to lean, I've also heard that it means your running to rich, I have checked all my clamps and bolts and it doesn't seem to be the cause of it. I also took the mufflers off and it still did it then. Any idea on how to fix this? My bike runs perfectly fine, I'm just concerned that I'm running too lean and doing damage to something.

P.S. I am on factory exhaust nothing aftermarket.

Thanks!
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post #2 of 18 (permalink) Old 04-29-2017, 04:48 PM
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Unmetered, raw unburnt fuel entering the exhaust...you've got a runaway carb float valve problem

Furthermore, i'd suggest checking the crankcase oil for fuel contamination too.
If the oil level has *risen*...correct the carb problem...flush the oil by changing once with cheap stuff...run a mile or two and change again with your final choice oil.

This condition can be deadly for main and rod bearings

Don't blow this off...its serious.

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post #3 of 18 (permalink) Old 04-29-2017, 06:49 PM Thread Starter
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Runaway as in its stuck or that the needle is not closing the valve?
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post #4 of 18 (permalink) Old 04-29-2017, 06:53 PM Thread Starter
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And how does that result in oil contamination?
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post #5 of 18 (permalink) Old 04-29-2017, 07:08 PM
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And how does that result in oil contamination?
Raw fuel washing down past the rings maybe?
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post #6 of 18 (permalink) Old 04-29-2017, 07:24 PM
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How long since the valves have been checked?
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post #7 of 18 (permalink) Old 04-29-2017, 07:37 PM Thread Starter
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Im not to sure. I only got the bike a few weeks ago. Its only got 8k miles, and I just took my carbs out and took off the floats and from my first reaction I don't think that is the problem. They are real clean, and it fires right up and runs without problems performance wise. I think it might just be an air/fuel ratio problem, possibly running a little lean. But I'm not 100% sure how to adjust that

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post #8 of 18 (permalink) Old 04-29-2017, 08:30 PM
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a little lean? not quite

what is burning, flaming out the exhaust? ....fuel
how is fuel getting there? .....passing raw, unburned from the combustion chamber...out the exhaust valves... into the exhaust system
where is the excess fuel coming from? ....the carburetor(s)
what controls and regulates on/off flow within the carb(s)? ...the float system
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post #9 of 18 (permalink) Old 04-30-2017, 06:58 AM Thread Starter
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Well I still don't get how any of that would have to do with the crankcase oil. If the fuel was theoretically getting into my crankcase then I would have bad piston rings which is an entirely different problem.
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post #10 of 18 (permalink) Old 04-30-2017, 07:40 AM
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Well I still don't get how any of that would have to do with the crankcase oil. If the fuel was theoretically getting into my crankcase then I would have bad piston rings which is an entirely different problem.
When you have a carb flooding the extra fuel goes into the combustion chamber & washes down past the rings into the crankcase & into the oil.......The rings are not designed to hold back fuel.......Especially when the engine is not running......Trust me when I say you were given solid advise from Ducatiman.......You asked a question & given a solution......We have been there before & seen this problem.
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