Front Carb keeps messing up - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 17 (permalink) Old 11-24-2006, 05:32 PM Thread Starter
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Cool Front Carb keeps messing up

I have a 98 vn750 that has about 45k on it. here is what it is doing. If new plugs are in it and everything had been drained from the carb I can get about 100 or so miles before the carb starts dumping too much fuel into the front cylinder. I thin this because the plugs are fouled with extra gas residue (thick fluffy looking black stuff) Once the plugs are fouled the front cylinder goes out completely. I have taken the carbs out and cleaned them multiple times, adjusted fuel air on them, checked the jets, float Ext. I still con not seem to find the problem. At one pint I thought perhaps I had a coul doing out so I switched the rear coil and the front to see what would happen. Still only from was effected.

If anyone has any ideas what in the world could be going on with my bike and how to repair it that would be great.




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Mike
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post #2 of 17 (permalink) Old 11-24-2006, 08:54 PM
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it sounds like the float sticks but you say you have checked that....could it be vacuum related??

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post #3 of 17 (permalink) Old 11-24-2006, 09:43 PM Thread Starter
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Quote:
Originally Posted by TrashLord
it sounds like the float sticks but you say you have checked that....could it be vacuum related??
I do not think there as a vacuum leak, but I guess it is possible. I have checked all the tubes to be sure they are free of holes and dry-rot and made sure they are all connected properly. Is there anything beyond that that I can do
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post #4 of 17 (permalink) Old 11-24-2006, 11:11 PM
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Rember the front cylender is controled by the left carb. Some people have gotten them mixed up.
Have you checked the diaphram, could have a crack in it.

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post #5 of 17 (permalink) Old 11-25-2006, 09:48 AM
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i'd check the diaphram.... keep in mind, that the amount of air/fuel is actually controled by the vacume, not the throttle in CV style carbs. All the throttle does is release pressure on the slide to allow the vacume to open it....also could be a stuck float.

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post #6 of 17 (permalink) Old 11-26-2006, 05:56 PM
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Sounds like a stuck float. If you haven't already, try the Seafoam treatment. Seafoam can help in most situations like this. If not, you may need to tear the carbs apart again and go over the float assembly with a fine toothed comb. You didn't mention how many miles are on the bike but just to let you know, the float valves can wear a groove in them that prevents them from closing properly. If the rubber part of the valve has an indentation in it where it seats with the fuel feed, this may be your problem. Any small crud in this area will cause similar problems. It could be a small piece of silicon or something.

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Last edited by Sky Rider; 11-26-2006 at 05:58 PM.
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post #7 of 17 (permalink) Old 11-26-2006, 06:18 PM Thread Starter
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Well I have tried Seafoam again and after a full day of riding it has fouled up again. I think this next week I am going to tear the Carbs out again, as much as I don't want to. I will keep all of you posted as to my progress.
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post #8 of 17 (permalink) Old 11-27-2006, 11:00 AM
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I have the same bike with the same problem and I was wondering if you ever figured out what the problem was.

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Morenste
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post #9 of 17 (permalink) Old 11-28-2006, 01:11 PM
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My 93 was doing this awhile back and I ended up taking the carbs off and going over them. I didn't find anything but upon reinstall, the problem was fixed. Although I didn't see anything, I blew out all the openings with low pressure compressed air.
Again, double check where the float valve seats with the fuel intake and check the valve for an indentation where the rubber meets the brass. If the rubber is indented, this will cause an improper seal and allow the float to flood causing the poor performing cylinder.

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post #10 of 17 (permalink) Old 11-28-2006, 04:27 PM
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If the front cyl is running that rich, I'm going to suggest you check your petcock vacuum lines and make sure you're not leaking gas from the petcock through the vacuum line to the intake. If so, it will run rich as heck.

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