VN750 only runs with starter button pressed - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 15 (permalink) Old 07-18-2018, 07:38 PM Thread Starter
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VN750 only runs with starter button pressed

I have a 750 that has been stored for two years. It ran great when it was put away. Fuel was drained, oil in the cylinders exhaust blocked etc. Battery was on a maintainer, but died during that time. I am trying to get it started using a charger with jump capabilities. Bike starts, but shuts off as soon as the starter button is released. The headlight is also not coming on. Any thoughts? Could it be a battery issue? Any thoughts would be appreciated. I tried it again with a good battery it still has the same problem.

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post #2 of 15 (permalink) Old 07-19-2018, 04:26 AM
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This has come up a couple times in the past. There hasn't been a proven culprit or fix. Here are a couple links that have troubleshooting suggestions. Maybe you'll find something that helps your specific case ...

https://www.vn750.com/forum/19-elect...n-pressed.html
https://www.vn750.com/forum/19-elect...on-pushed.html

All indications are that there's either a bad component in the CDI or a wire to or from the CDI is broken.

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post #3 of 15 (permalink) Old 07-19-2018, 10:38 AM
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Clean ignition switch

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post #4 of 15 (permalink) Old 07-19-2018, 11:05 AM
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If you find the problem, post what it was, you can be the first to definitively answer this mystery. We've seen this a few times, but never got a conclusion that I've read.

Reading the links Thorn posted, I get the idea that the Ignitor box (cdi) could be the problem, but it's just a hunch and I'm often incorrect.

When time allows, I plan to experiment with the red/white wire in the start circuit running to the Ignitor. I'm now wondering, if the r/w wire doesn't put voltage to the Ignitor, does that cause the 'start button/no run' problem? Switching inside the Ignitor doesn't happen unless the r/w wire signals first via the voltage input?

My first test would be to see if the red/white at the IC Ignitor on jiml7's bike has voltage when the start button is pressed. A yes answer shoots down the hare-brained theory I just posted, but wouldn't rule out a bad IC Ignitor box. A no answer would mean that could be the culprit, then I would apply 12v to the r/w and see if the problem is gone.

This red/white wire only gets power when the start button is pressed. I'm thinking there has to be a start circuit and a run circuit in the IC Ignitor, so obviously then we need to find why the run circuit isn't working.

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post #5 of 15 (permalink) Old 07-19-2018, 11:24 AM
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Headlight not working - Could mean the stator isn't working, but the light and the stator would need testing to know.

The Blue Wire Mod will make the headlight come on as soon as the key is on.

Do the other lights work when you turn the key on?

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post #6 of 15 (permalink) Old 07-19-2018, 11:43 AM Thread Starter
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I have a replacement starter switch assemble I bought a couple of years ago. Going to try that and clean up all of the contacts and see what happens.

Thanks for the input and ideas!
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post #7 of 15 (permalink) Old 07-19-2018, 02:26 PM
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I'll be very surprised if replacing the ignition switch does anything. The start button circuitry is all on one leg of the switch, so if the switch were the culprit the start button would be totally dead.

Whereabouts do you live, jiml7? Wondering if we could possibly drop in a known CDI box to see if that resolves the issue.

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post #8 of 15 (permalink) Old 07-19-2018, 04:19 PM Thread Starter
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I was thinking the same thing Thorn. I live in the Seattle area. I was looking at the CDI's on Ebay, but am not sure I am willing to risk 50-75 bucks on an unknown box. I am going to try cleaning up the contacts on the CDI and see if that helps any. Do you have one available?
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post #9 of 15 (permalink) Old 07-19-2018, 04:47 PM
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The CDi is my first suspect. When this same problem happened on some 60s GM cars, it was always the ballast resistor on the side of the coil. The CDi takes the place of several of those components.

I've driven a few miles holding key in 'start', and the starter screaming for mercy. Sometimes you get home the best way you can.

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post #10 of 15 (permalink) Old 07-19-2018, 06:18 PM
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Quote:
Originally Posted by jiml7 View Post
I was thinking the same thing Thorn. I live in the Seattle area. I was looking at the CDI's on Ebay, but am not sure I am willing to risk 50-75 bucks on an unknown box. I am going to try cleaning up the contacts on the CDI and see if that helps any. Do you have one available?
Any members in the Seattle area reading this?

I believe I have one in working order (I haven't used it, but it is in used condition), but the shipping from Pennsylvania and back might not be worth it.

1992 US-nonCA * tuxedo mod * r/r relocated

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