carb synch problem? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 19 (permalink) Old 12-06-2006, 07:28 PM Thread Starter
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carb synch problem?

hopeffully someone can give me a little direction in which way to go to solve my problem. the problem is whenever i go above 60mph or on a hard excel. the bike stumbles and mildly jerks and can't get much speed to pass. i have VH cruisers with no jetting mods. i have run sea foam thru it every 1/3 fill up. the bike is a 2000 with 14,000 miles on it and average 50-53mpg. so i guess i have 3 ways to go and need your feedback and/or past experiences.

1) sticky float or low level, so when i step on the gas i have to wait for the gas to get there thru the lines. not sure about this one though.

2) maybe because of the new pipes and less back pressure at top end, i need to rejet to get more gas in the cylinder to get it up to speed. here is no reason to rejet with cruisers but this could be the problem since it runs pretty good at moderate speeds.

3) could carbs out of synch cause this? it has 14,000 miles and i know perviuos owner never touched the carbs. he got the bike with 5,000 miles on it.

and 4) i'm totally clueless and its something entirely different.

please give me your thoughts as i have 3 months to figure this out till the snow melts. thanks in advance and keep it safe, J
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post #2 of 19 (permalink) Old 12-06-2006, 07:31 PM Thread Starter
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just an FYI i did cut the vent tube that goes into the right ear at an angle, so i know that's not the problem
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post #3 of 19 (permalink) Old 12-06-2006, 09:04 PM
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Is there rust in the tank? Might be something clogging the jets. I have the same exact problem but two thousand more miles on my '93. I'll be reading up on this one too.

Mike
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post #4 of 19 (permalink) Old 12-06-2006, 09:44 PM
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Unless the carbs have been removed and split, there is usually no reason to sync the carbs. However, it is an easy procedure to do once you build the $3 manometer.

Jim W
93 VN 750 "Ursula"
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post #5 of 19 (permalink) Old 12-07-2006, 02:22 AM Thread Starter
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the tank looks real clean, but maybe if there is some kind of filter in the petcock that could be clogged with dirt or residue. just might have to remove tank and check this winter.
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post #6 of 19 (permalink) Old 12-07-2006, 04:32 AM
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What about the air filters? Have they been cleaned recently?


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post #7 of 19 (permalink) Old 12-07-2006, 05:48 AM Thread Starter
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yes they have been clean, they looked real good when i cleaned them. but it might be time to get new ones couldn't hurt
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post #8 of 19 (permalink) Old 12-07-2006, 06:09 AM
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Well, IMO, if they didn't fall apart when ya cleaned them (mine were starting to deteriorate when I cleaned them, so I got new ones) they should be good for a while longer.

Does it still stumble if ya down shift, then open it up ?


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post #9 of 19 (permalink) Old 12-07-2006, 06:24 AM
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Have You Checked The Spark Plugs, Also Check Your Carb Diaphrams, I Had Similar Simptoms From A Split In One Of Them.

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post #10 of 19 (permalink) Old 12-07-2006, 01:47 PM
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Check that vacuum hoses on the carb. If one has a hole in it that might cause the stumbling.

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