Running like crap, can you give me an idea or two..... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 25 (permalink) Old 03-15-2010, 07:38 PM Thread Starter
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Exclamation Running like crap, can you give me an idea or two.....

I just cleaned my carbs and floats. I can get the bike running, and it stays running for a little while, about 5 minutes or so. While I have it running I take it for a little ride around a parking lot and down an alley, by the time I get to the end of the alley and I am slowing down to stop the bike starts to die, acting like it is starving for fuel. Then I can't start it after that. When I get it back to the garage I put it on the charger and I notice that there is about 12 volts on the battery, when before it had almost 16 volts. That makes me think that maybe the problem lies with the Stator.

However, the previous owner removed the exhaust canister (between the two pipes) and put in straight pipes, to make it louder. Because of that, I am not sure if it is the jets causing this problem. I think the jets are stock, not sure.

One more thing, after the battery is fully charged and I start it, it idles fine. After it runs for a little while, it doesn't idle at all.

Does anyone know what could be causing this? Any help woudl be greatly appreciated!!!!
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post #2 of 25 (permalink) Old 03-15-2010, 07:50 PM
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any back firing, missing, or hesitation?
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post #3 of 25 (permalink) Old 03-15-2010, 07:58 PM Thread Starter
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It did backfire a little, but then I set the air jets to 2.5 turns. Doesn't seem to be missing, the plugs do get very black (but dry) even after I clean them in the sand blaster cabinet then run it for a little bit. I do get hesitation when I try to get on the throttle.
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post #4 of 25 (permalink) Old 03-15-2010, 09:19 PM
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Sounds like the carbs are way to rich. Do you get any black smoke out of the exhaust when it is running. By what you wrote, do these plugs get that black after only a short time of running.

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post #5 of 25 (permalink) Old 03-15-2010, 09:31 PM Thread Starter
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no black smoke out of the pipes, but how do I change how rich it is running? I have the jets that I can adjust from the side of the carbs set to 2.5 turns backed out.
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post #6 of 25 (permalink) Old 03-15-2010, 10:06 PM
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Let's back up a step: How was the bike running before you cleaned the carbs? Was it behaving the same way?

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post #7 of 25 (permalink) Old 03-15-2010, 10:11 PM Thread Starter
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I don't know, I bought it this way. When I bought it, gas was literally pouring out of the left air cleaner when I got it running. So I figured it was the carbs needed cleaning. I cleaned them, also replaced plugs and rebuilt the petcock.

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post #8 of 25 (permalink) Old 03-15-2010, 10:26 PM
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I would say at this point it is not a carb problem but a battery and charging system problem. 16v is an overcharge of the battery and will damage the plates and cause the electrolyte to boil excessivly.

12.0 v is not enough volts to turn over the engine and have enough volts for the ignition system, you need around 12.3-12.4v.

12.6 is 100% charge for flooded wet cell batteries and 12.7 for MF AGM. For every 0.1v you drop you loose 10% state of charge. At 12.0v your battery is around 40% state of charge and the engine will not fire off.

What type of battery do you have?


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post #9 of 25 (permalink) Old 03-15-2010, 10:30 PM
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If the problems go away after charging the battery, I would think it has to be electrical, unless purely letting the bike sit long enough to charge allows it to idle (maybe a carb flooding).
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post #10 of 25 (permalink) Old 03-15-2010, 10:32 PM Thread Starter
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not sure what type of battery, the charging system.... is that the stator?
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