Engine not starting, Need help trouble shooting - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 27 (permalink) Old 09-17-2017, 03:15 PM Thread Starter
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Engine not starting, Need help trouble shooting

91 Vn750. I had the engine out for a year. Changed the stator and stator rotor so took the engine cover off completely. Put everything back together. I have 1 year old iridium plugs and new gas. Cleaned the air filters and carb. It just turns over and over and over. No back firing, only one small hick up when spraying starting fluid into the plug ports and/or carb intake. Plugs have gas on them, sparkplugs spark. Battery does not hold a charge but i have jumper cables or boost box on the battery. I have also rejetted it up 2 sizes on each. Also degoated and put after market exhaust on.... but that shouldnt be the issue right?

Not sure what else to try.. any help would be appreciated.

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Last edited by duraholiday; 09-17-2017 at 03:27 PM.
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post #2 of 27 (permalink) Old 09-17-2017, 04:16 PM Thread Starter
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Also with the bike on the kick stand, the bike tilted, gas is coming out of the tail pipe. Im starting to think the timing is off. The balance gear was rotated when the fly wheel, rotor, was off but the marks were lined back up.

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post #3 of 27 (permalink) Old 09-17-2017, 10:32 PM
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Sounds like a stuck float with the gas running out the pipes.

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post #4 of 27 (permalink) Old 09-18-2017, 03:58 PM
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x2 spockster - had same experience with gas out the pipes, and the error was in the carbs.
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post #5 of 27 (permalink) Old 09-18-2017, 07:42 PM
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try Wolfie's blowback method

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post #6 of 27 (permalink) Old 10-18-2017, 09:38 PM Thread Starter
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Quote:
Originally Posted by OleDirtyDoc View Post
try Wolfie's blowback method

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Which is?

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post #7 of 27 (permalink) Old 10-18-2017, 09:51 PM Thread Starter
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Quote:
Originally Posted by Spockster View Post
Sounds like a stuck float with the gas running out the pipes.
I think Im off 180 degrees. I have air and fuel blowing back through the carb so i think my intake valves are still open when compressing. Plus if I had a stuck float wouldnt it still back fire at least the other cylinder would fire? What are the odds that both my floats were stuck especially since I cleaned the carbs before putting the engine back on the frame.

So how do I check the timing? Theres the balance gear and the fly wheel (roter). They were the only things that moved when the engine was out so what could have gone wrong?


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post #8 of 27 (permalink) Old 10-18-2017, 10:18 PM
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Floats tend to stick most right after the carb has been dry.

Did you have the cams out or the timing chains off? Anything to do with the valve timing or mixing the cams up?

A compression test would show if it's compressing with intake valves open. You just get a low reading, if any. An air test would define it without a doubt, similar to a leakdown test, just without gauge readings.

You really can't alter the ignition timing any, not without re-engineering the pickup coils or the electronics. But ignition timing wouldn't send air back out the intake.

Intake valve stuck open is a possibility, but a huge stroke of bad luck to have it on two cylinders. All the exhaust mixes inside the goat belly, so just checking tailpipes isn't a good indicator of which cylinder has the problem.

With gas pouring out of the pipes, I doubt it could backfire on the flooded cylinder. Not saying it can't, but it's a lot less likely, and I'd want a fire extinguisher close just in case.

Mine would always start up on one cylinder, the idle was down by almost half when it did.

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__________________________________________________ ____________
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Last edited by Spockster; 10-18-2017 at 10:22 PM.
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post #9 of 27 (permalink) Old 10-18-2017, 10:34 PM
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Quote:
Originally Posted by duraholiday View Post
Also with the bike on the kick stand, the bike tilted, gas is coming out of the tail pipe. Im starting to think the timing is off. The balance gear was rotated when the fly wheel, rotor, was off but the marks were lined back up.

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If that's all, your timing is still fine, both ignition and valve timing.

If the marks were off on the balance gear, it would just shake violently, but still start and run.

The rotor is the part that determines ignition timing, and it only goes on one way. The valve timing can't change without removing the timing chains.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #10 of 27 (permalink) Old 10-18-2017, 10:46 PM Thread Starter
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I did not touch anything but the fly wheel (stator rotor). The balance rotated when I took it off but i just rotated it back to line up the marks.

I know the valves are extremely dirty. I might change them now since the bike isnt running.

The pulser coils, i think they are called, are the 2 magnets by the stator correct? I bought used ones, could that be an issue?

How would I get the floats unstuck? I have never had a float stuck in any of my bikes after a carb clean before?

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Last edited by duraholiday; 10-23-2017 at 02:25 AM.
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