Starting problem - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
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post #1 of 27 (permalink) Old 06-29-2019, 10:51 PM Thread Starter
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Starting problem

So I got stranded again today... it’s becoming a common theme... it would run for a little bit. And when I went to stop, it would die. After pushing the bike a mile home, I put it on the charger, and a second later, it was firing up. But, if it died, it would not start again. This video is from when it died in a parking lot behind my house, and in real time.
So then I went to do the coil bypass mod. It seems to be turning over much quicker, but it will not start. I took out the front and rear spark plug, held my finger over the boot, and no spark now. I ran the wire to the front coil, a wire to the back coil, and a third wire to the relay with a ton of flux and solder. I am assuming a bad connection? Advice would be appreciated. I am not sure if the issue from earlier was resolved, as the bike won’t start.


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'08 Road King Classic
'86 VN750 with the following work done to it, after sitting for 19 years:
John 8:44
REV 2:9
REV 3:9
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post #2 of 27 (permalink) Old 06-29-2019, 11:35 PM
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You did the mod as in the pic, yes?

I don't think you get the spark holding a finger over the boot. Try placing a phillips screwdriver in the connection in the boot and hold the exposed metal shank of the screwdriver close to the cylinder. 1/8 inch off. Crank and see if there's a spark from the screwdriver to the cylinder. Helps to do it in a dark garage or night.

If you see a spark, th mod should be OK.
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2003 VN750
Velorex 562 sidecar w/trunk
2-wire mod
Headlight power switch
Manual fan switch
Shingigen SH775
Blue wire mod
Yellow wire mod
RLU removed
RR moved
Voltmeter relay wired
Coils direct wired w/relay
TOC MCCTs
handicap mods:
extended foot shift
heel shifter
extended brake pedal
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post #3 of 27 (permalink) Old 06-30-2019, 06:54 AM Thread Starter
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Quote:
Originally Posted by Hench View Post
You did the mod as in the pic, yes?



I don't think you get the spark holding a finger over the boot. Try placing a phillips screwdriver in the connection in the boot and hold the exposed metal shank of the screwdriver close to the cylinder. 1/8 inch off. Crank and see if there's a spark from the screwdriver to the cylinder. Helps to do it in a dark garage or night.



If you see a spark, th mod should be OK.


That is the one that I did. I took out the spark plug while attachéd to the boot, held it next to the block on both cylinders, and no spark. I will go back over the wiring today to see what it was, but I would think the red wires first, since neither coil was functioning.


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'08 Road King Classic
'86 VN750 with the following work done to it, after sitting for 19 years:
John 8:44
REV 2:9
REV 3:9
www.voat.co
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post #4 of 27 (permalink) Old 06-30-2019, 07:34 AM
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Yes, check the red wires. Also the relay trigger wires. If you have a meter check the relay also. When I did the mod the first relay I bought was bad out of the package. It "clicked" when I turned on the ignition but didn't complete the "hot" circuit.

2003 VN750
Velorex 562 sidecar w/trunk
2-wire mod
Headlight power switch
Manual fan switch
Shingigen SH775
Blue wire mod
Yellow wire mod
RLU removed
RR moved
Voltmeter relay wired
Coils direct wired w/relay
TOC MCCTs
handicap mods:
extended foot shift
heel shifter
extended brake pedal
Hench is offline  
post #5 of 27 (permalink) Old 06-30-2019, 07:50 AM Thread Starter
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Starting problem

Okay so when the ignition is on, 87 becomes grounded. This is going to the two coils. I do not have a multimeter, so I will try a new relay. I got it from autozone, so swapping it shouldn’t be a problem. I just checked again, there was no spark at either cylinder, but the relay clicks as soon as the ignition is turned on. Hopefully this will solve the dying at low RPMs and not starting issue too
*update*
I just hooked it back to factory and it fired right up. I think the relay could be bad. It was over 90 yesterday, maybe this is the hot start issue?

Sent from my iPhone using Tapatalk

'08 Road King Classic
'86 VN750 with the following work done to it, after sitting for 19 years:
John 8:44
REV 2:9
REV 3:9
www.voat.co

Last edited by MSattler; 06-30-2019 at 08:40 AM.
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post #6 of 27 (permalink) Old 06-30-2019, 09:06 AM
2003 Vulcan 750/Sidecar
 
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Relay could be bad. Mine was a Bosch so everybody can have a "bad day". If going back to factory and it started cold that's good. I think the hot start issue is when the bike is restarted after the engine is hot from running.

Check the spade connectors on the new red wires to make sure they're good. I used crimp on and missed a connection. You should get a meter. With the electrical on these "old" bikes having other issues you need one.

If it runs with the old wiring, ride it around the block a few times, shut it down and restart to see how it does.

Do you have an AGM battery or flooded/wet cell? These bikes really like the AGM and need 12+ volts for starting. Might want to have the battery load tested.

2003 VN750
Velorex 562 sidecar w/trunk
2-wire mod
Headlight power switch
Manual fan switch
Shingigen SH775
Blue wire mod
Yellow wire mod
RLU removed
RR moved
Voltmeter relay wired
Coils direct wired w/relay
TOC MCCTs
handicap mods:
extended foot shift
heel shifter
extended brake pedal
Hench is offline  
post #7 of 27 (permalink) Old 06-30-2019, 09:35 AM
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Lowe's has a good selection of meters starting around $20-25. If you get a $5 meter, you'll spend all your time being quality control for the store.
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2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #8 of 27 (permalink) Old 06-30-2019, 09:44 AM
2003 Vulcan 750/Sidecar
 
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Good morning, Spockster! was hoping you'd join in!

MSattler, Spockster has the knowledge to get to the problem faster than I do!
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2003 VN750
Velorex 562 sidecar w/trunk
2-wire mod
Headlight power switch
Manual fan switch
Shingigen SH775
Blue wire mod
Yellow wire mod
RLU removed
RR moved
Voltmeter relay wired
Coils direct wired w/relay
TOC MCCTs
handicap mods:
extended foot shift
heel shifter
extended brake pedal
Hench is offline  
post #9 of 27 (permalink) Old 06-30-2019, 09:58 AM
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Quote:
Originally Posted by Hench View Post
Good morning, Spockster! was hoping you'd join in!

MSattler, Spockster has the knowledge to get to the problem faster than I do!
'morning! Nah, you're doing just fine.

Load test and charging volts for first two steps troubleshooting the dying/starting problem, after getting spark back.

If that's a Walmart wet cell, it carries a higher percentage probability of being weak.
MSattler likes this.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 06-30-2019 at 10:03 AM. Reason: dying/starting
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post #10 of 27 (permalink) Old 06-30-2019, 10:05 AM
2003 Vulcan 750/Sidecar
 
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Thanks!

A new AGM. iridium plugs and the coil mod cured my hot starting issues. Look at Spockster's 2 wire mod. Cured some other problems I had.

Well, after this is solved! :~)
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2003 VN750
Velorex 562 sidecar w/trunk
2-wire mod
Headlight power switch
Manual fan switch
Shingigen SH775
Blue wire mod
Yellow wire mod
RLU removed
RR moved
Voltmeter relay wired
Coils direct wired w/relay
TOC MCCTs
handicap mods:
extended foot shift
heel shifter
extended brake pedal
Hench is offline  
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