1993 Vulcan cuts out above 3500RPM - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 20 (permalink) Old 09-01-2006, 11:56 AM Thread Starter
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1993 Vulcan cuts out above 3500RPM

My bike cuts out under load above 3500rpm but if I put it in neutral it'll rev up to redline. I've had the carbs off twice. Once to clean and once to adjust float level. The spark plugs are light tan in color and the bike idles great. The spark looks good and I've checked for vacuum leaks. The tank is clean and the petcock checks good. I've yet to check compression and electrical components.

Anybody have this problem? What's the fix?
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post #2 of 20 (permalink) Old 09-01-2006, 01:27 PM
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fuel??? drawing more under load and starving? not sure about safety but how about using spare key in cap and when starts to die out pop that baby open and see what happens.just a guess from me though as I'm still learning this bike.

disclaimer: trying my idea could be hazardous to your health!!!

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post #3 of 20 (permalink) Old 09-01-2006, 01:39 PM Thread Starter
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Done it...nothing
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post #4 of 20 (permalink) Old 09-01-2006, 05:25 PM
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humm... tan like early fouling, or tan like plug is burning?

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post #5 of 20 (permalink) Old 09-01-2006, 05:33 PM Thread Starter
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Quote:
Originally Posted by Hizzo3
humm... tan like early fouling, or tan like plug is burning?
Tan like good plugs. They are a little lighter than the good plugs I have in my other bikes. I put in some new plugs I had and they didn't make any difference.

I had an S10 that had the same characteristics, but it was because the plugs got too hot. I replaced them and it runs fine.

The kicker is all of a sudden this bike started acting this way and that is what makes me think it is electrical.
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post #6 of 20 (permalink) Old 09-01-2006, 10:41 PM
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Just a thought.... you say you took the carbs off to adjust floats?? are they not suposed to be adjusted on the bike??? if so they may be set too low and you are running too lean.

I may be wrong here, but it is a thought.

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post #7 of 20 (permalink) Old 09-03-2006, 07:21 AM
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I'd say the floats are set too low, as 93VN750 says, the float level should be checked with the carbs on the bike. As Trashlord says, there will be less fuel demand in neutral so the problem may not show up until it's under load.
Also, may be worth checking to see if any of the fuel lines are getting pinched under the tank somewhere & restricting the fuel flow.
Will be intersted to hear what the problem was when you finally get it sorted.

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Last edited by Ernie; 09-03-2006 at 07:23 AM.
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post #8 of 20 (permalink) Old 09-06-2006, 01:33 PM Thread Starter
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What I've done to date (to no avail):

Checked float level (checks at the correct level according to Clymer)
Synchronized carbs
New spark plugs (plugs have excellent color)
resistance check of the pulse coil (330 to 530 ohms, mine checked at 520ohms)
New hoses
Petcock and fuel filter check good
No vacuum leaks that I can find
Engine compression test (150 psi both cylinders)
Checked electrical connections
Voltage and current test of charging system

What I'm doing tonight:

Look at vacuum hoses again
Run the bike without carb air intake boots
Resistance check coils and igniter
Check sidestand switch connection

If all else checks good I need to find someone with a good running Vulcan and then swap electrical components one at a time. If that fails, I'll check the carbs again. If that fails....Bonfire!
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post #9 of 20 (permalink) Old 09-06-2006, 01:47 PM
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Before you do all that, put the bike on the center stand, get on it, start it, and run through all the gears. This is a slight load, but you will know if the problem is truly with the engine or something with the drivetrain.

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post #10 of 20 (permalink) Old 09-06-2006, 01:56 PM Thread Starter
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Last night I was able to coax it into running above 4000rpm by gettin up to speed in 2nd or 3rd gear and then shifting down so the revs got up to about 6500rpm. The bike would run all the way to redline with some slight hiccuping, but as soon as I brought the revs down to 4000 again, the misfiring would take over.
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