No fire, No spark - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
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post #1 of 37 (permalink) Old 08-06-2014, 09:18 PM Thread Starter
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No fire, No spark

I'm not getting spark on any plug. Last year I did the pickup coil mod and coil pack mod. It worked last year with the only issue being it was hard to start. Fast forward to now. I just recently pulled the motor to fix the stripped plug and replace the starter clutch. Pretty much wound up being a whole top end rebuild. Get the motor in the bike and no spark. Verified wires were all connected and they were. I believe I did the saftey switch mod correctly by grounding out the black wire in the small plug of the JB.

Tried testing the coil packs but I'm only getting an ohm reading when checking the two terminals. Both are about 23 I believe. When I try to get a reading with one end on the terminal and the other in the spark plug boot I get nothing. Not sure what I am doing wrong here. Well my friend has another vulcan and thought what the hell. I pulled the IC and got a nice blue spark. It sounded promising. Well by the time I put the stator cover back on, tank on and put the two plugs in and pushed her outside I got nothing, no spark. Pulled a plug to verify and nothing. To make sure we didn't fry his IC we put it back on his bike and it worked. I'm lost how we managed to get spark and then the second time nothing. Thoughts what I am overlooking here.

1992 Vulcan 750.
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Last edited by theone2043; 08-06-2014 at 09:21 PM.
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post #2 of 37 (permalink) Old 08-06-2014, 09:45 PM
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So to clarify, the motor is spinning and turning over freely, just no spark so it doesn't start...


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post #3 of 37 (permalink) Old 08-06-2014, 09:54 PM
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Sounds like your clutch switch is acting wonky
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post #4 of 37 (permalink) Old 08-06-2014, 09:58 PM Thread Starter
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That's correct. It spins freely, smell gas so I assume its getting gas just no spark. If it was the clutch switch wouldn't that have been bypassed by jumping the black 12 pin wire on the JB to the neg of the battery?

Slim right now the clutch is really loose, I haven't had the time to adjust it. I'm not holding the clutch in when starting it so I didn't think to check that out. Bike is in neutral so I wasn't worried about it right now.

1992 Vulcan 750.
Ear shaved and re-jetted.

Last edited by theone2043; 08-06-2014 at 10:00 PM.
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post #5 of 37 (permalink) Old 08-06-2014, 10:35 PM
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ground the black wire with white stripe at the ignitor connector , run a wire from this pin to the negative battery terminal. you should be able to stick a probe in the back side of the connector , we are talking ignitor not jb.


99 vn750A15
stator mod and r/r mod
ignition coil mod
ignitor power circuit and ground circuit mod
ear shave rejet 142/42 plus .040 shimmed
vance and hines exhaust no baffles
custom paint
volt meter
petcock mod
new backrest and pad (no pic yet)
cooling fan cut off switch mod
jbm carb diaphrams (must have)
mcct mod
pickup coil mod
AGM Battery

did all the mods and repair work and custom paint myself. except exhaust.
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post #6 of 37 (permalink) Old 08-06-2014, 10:40 PM
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Quote:
Originally Posted by theone2043 View Post
That's correct. It spins freely, smell gas so I assume its getting gas just no spark. If it was the clutch switch wouldn't that have been bypassed by jumping the black 12 pin wire on the JB to the neg of the battery?

Slim right now the clutch is really loose, I haven't had the time to adjust it. I'm not holding the clutch in when starting it so I didn't think to check that out. Bike is in neutral so I wasn't worried about it right now.
Not the clutch itself. There is a switch under the clutch lever perch with three weeks coming out of it.... so if bike is in neutral. GeGreen light on? If so them you havea loose white on the icb connector or on the jb

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post #7 of 37 (permalink) Old 08-06-2014, 10:52 PM
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grounding the black white wire on the ignitor connector bypasses clutch and neutral and sidestand switch for ignitor spark.


99 vn750A15
stator mod and r/r mod
ignition coil mod
ignitor power circuit and ground circuit mod
ear shave rejet 142/42 plus .040 shimmed
vance and hines exhaust no baffles
custom paint
volt meter
petcock mod
new backrest and pad (no pic yet)
cooling fan cut off switch mod
jbm carb diaphrams (must have)
mcct mod
pickup coil mod
AGM Battery

did all the mods and repair work and custom paint myself. except exhaust.
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post #8 of 37 (permalink) Old 08-06-2014, 11:00 PM
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here is diagram of igniter connectors showing the black wire with white stripe pin 5 on large connector, not the pickup coil small connector. If this wire has no ground the igniter will not produce spark, it gets its ground from the sidestand switch when driving bike. It can also get its ground from the other two safety switches PROVIDING THE HARNESS IS GOOD AND THE OTHER TWO SWITCHES ARE GOOD. Just because the starter circuit relay is getting its ground through the clutch or neutral switch does not mean the igniter is getting its ground. I had same exact issue and my harness was bad somewhere, once I grounded this pin5 on ignitor no problems since. but the bike will drive with sidestand switch down now.
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99 vn750A15
stator mod and r/r mod
ignition coil mod
ignitor power circuit and ground circuit mod
ear shave rejet 142/42 plus .040 shimmed
vance and hines exhaust no baffles
custom paint
volt meter
petcock mod
new backrest and pad (no pic yet)
cooling fan cut off switch mod
jbm carb diaphrams (must have)
mcct mod
pickup coil mod
AGM Battery

did all the mods and repair work and custom paint myself. except exhaust.

Last edited by V750_outlaw; 08-06-2014 at 11:19 PM.
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post #9 of 37 (permalink) Old 08-07-2014, 08:38 AM Thread Starter
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But shouldn't have grounding that wire on the JB done the same thing or is that just to ground out the JB and this will help with grounding out the IC?

1992 Vulcan 750.
Ear shaved and re-jetted.
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post #10 of 37 (permalink) Old 08-07-2014, 10:04 AM
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If you ground out at the jb, it doesn't isolate the harness between the jb and the icb
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