Plugs for Rear jug fouling out - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 05-19-2010, 06:16 PM Thread Starter
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Plugs for Rear jug fouling out

My bike is running very poorly. The exhaust pipe for the rear jug has smoke coming out of it when I starting it and I have noticed that gas drips from the that exhaust pipe as well. I have tried:
  • Changing the plugs
  • Cleaning the new plugs
  • Changed one of the plug wires for the rear jug (other one looks good)
  • Adjust the jets on the carb (1 1/5 - 2 1/2 screws out) "currently at 1 1/2"

With all of that I don't see any changes in how it runs. Does anyone have any suggestions on what could be causing the problem and how to fix it?
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post #2 of 9 (permalink) Old 05-19-2010, 06:51 PM
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Originally Posted by jimdeforge View Post
My bike is running very poorly. The exhaust pipe for the rear jug has smoke coming out of it when I starting it and I have noticed that gas drips from the that exhaust pipe as well. I have tried:
  • Changing the plugs
  • Cleaning the new plugs
  • Changed one of the plug wires for the rear jug (other one looks good)
  • Adjust the jets on the carb (1 1/5 - 2 1/2 screws out) "currently at 1 1/2"

With all of that I don't see any changes in how it runs. Does anyone have any suggestions on what could be causing the problem and how to fix it?
your carbs probably need a good cleaning sounds like a bad needle valve or a float issue .




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post #3 of 9 (permalink) Old 05-19-2010, 06:53 PM Thread Starter
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carbs were already cleaned and I ran some Seafoam through the tank on my last ride
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post #4 of 9 (permalink) Old 05-19-2010, 07:09 PM
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Try tapping the carb with a screw driver handle.

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post #5 of 9 (permalink) Old 05-19-2010, 07:15 PM Thread Starter
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weird solution, but I will give it a shot. Hope it works. What if it doesn't work though?

Could it be anything else? Like a weak or bad coil?

Last edited by jimdeforge; 05-19-2010 at 07:53 PM.
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post #6 of 9 (permalink) Old 05-19-2010, 07:52 PM
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Raw fuel, fuel going around the float needle. Stuck float or trash on needle seat. Very unlikely loose seat. There may other reason but this are the most likely.

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post #7 of 9 (permalink) Old 05-19-2010, 07:54 PM Thread Starter
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ok, thanks for the suggestions and info. I will give tapping the carb a try and make my last step to be taking it apart again
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post #8 of 9 (permalink) Old 05-20-2010, 10:51 AM
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If you end up taking the carbs off again, try this: hold the carb upside down (this simulates the bowl being full and float needle closed) and blow into the fuel inlet hose on the bowl for that jug. If the float is closed as it should be, no air will pass. If you can get any air through, the needle is probably dirty and not closing up as it should; hence, flooding (maybe not enough to kill the cylinder, but enough to fowl plug and run out exhaust)
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post #9 of 9 (permalink) Old 05-20-2010, 01:37 PM Thread Starter
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I will try that. However, I think I got my bike running good now, will test it out on the way to work. At least it idles good now. All I had to do is tap the rear carb with a screwdriver while I was spraying carb cleaner up through the drain plug.
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