Front cylinder will not fire - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 28 (permalink) Old 08-18-2008, 11:13 PM Thread Starter
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Front cylinder will not fire

Ok, so far I've installed a new ignitor module and a new OEM coil which came along with new wires. I still do not get a front spark.

I checked continuity of both the Red and Black wires between the two connectors (coil end and IC Ignitor end) and they're both reading .1 to .2 ohms, which tells me that there is continuity.

I have checked for resistance from the pickup coils from the wiring harness at the ignitor, and they seem to check out.

The rear cylinder fires right up without a problem.

Does anyone have any suggestion as to what to try next? The only thing I can think of is a problem with the pickup coil for the front cylinder. I'm thinking out loud here, but wouldn't it be possible for it to be bad, even though the resistance measurement checks out?

Regards,
Pete in Gaithersburg, MD

1996, 6,000 miles
Relocated R/R, Corbin seat, Plexifairing III, Sunpro Voltmeter, Sears MF.
Xelement X840 Saddlebags

Last edited by PoggiPj; 08-19-2008 at 12:15 AM. Reason: additional info
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post #2 of 28 (permalink) Old 08-19-2008, 01:04 PM Thread Starter
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Question

This morning I first ohms tested (front: 473, rear: 482), then swapped, the two pickup coils located inside of the stator cover. Front to rear, rear to front.

Expectation: If the front pickup coil was bad, now the rear would no longer spark, but the front ignition coil, now being triggered by what was the working rear coil, would now fire.

Results: The front cylinder still does not fire. The rear cylinder still does fire, although not enough to turn over the bike. So, I open the stator cover, and I return the two pickup coils back to their original positions. The bike starts, runs on only the rear cylinder. Front still doesn't fire.

What the heck is going on?

Regards,
Pete in Gaithersburg, MD

1996, 6,000 miles
Relocated R/R, Corbin seat, Plexifairing III, Sunpro Voltmeter, Sears MF.
Xelement X840 Saddlebags
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post #3 of 28 (permalink) Old 08-19-2008, 01:40 PM
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Do you have 12 v going to the front coil??? Turn on the key and check the voltage at the coils.

02 honda sabre 1100
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post #4 of 28 (permalink) Old 08-19-2008, 05:46 PM Thread Starter
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Yes, 12.66 going to the front coil.

I just swapped the two pickup coils behind the stator, and also switched the wires from the pickup coils into the ignitor. The rear coil still sparks, with what was the front pickup coil. the front ignition coil, now with the known good pickup coil, still doesn't spark.

So far, this is what I have...
  • New OEM ignitor,
  • new OEM ignition coil,
  • new OEM front wires (came with the coils)
  • new front plugs.
  • Proven working pickup coil.
  • Good continuity from all wiring harnesses

Of course, RonAyers says that they don't take back electronic parts, so if it's a bad ignitor, it's my problem. I'm getting completely disgusted.

Regards,
Pete in Gaithersburg, MD

1996, 6,000 miles
Relocated R/R, Corbin seat, Plexifairing III, Sunpro Voltmeter, Sears MF.
Xelement X840 Saddlebags
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post #5 of 28 (permalink) Old 08-19-2008, 06:21 PM
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Are you checking if the plugs are firing outside the engine, by grounding the the plug to the motor?

Glenn

1985 VN700
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Small Sport Windshield
R/R moved
Home built coasters
Kaw touring front fender
1990 Fuel tank
Kenda Kruz 110/90-19 & 170/80-15 tires
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post #6 of 28 (permalink) Old 08-19-2008, 06:56 PM Thread Starter
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Hi Glen,
Yes. I pull the wire off of the cylinder head. I insert a known good plug into the cable end. I press the outer body (ground) of the plug against the cylinder head. No spark results when doing this with either of the front ignition wires.

The same procedure produces a spark when performed with the two rear ignition wires.

Regards,
Pete in Gaithersburg, MD

1996, 6,000 miles
Relocated R/R, Corbin seat, Plexifairing III, Sunpro Voltmeter, Sears MF.
Xelement X840 Saddlebags
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post #7 of 28 (permalink) Old 08-19-2008, 07:43 PM
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I guess I would run two new wires from the igniter to the coil and make sure the coil has a good ground.

Glenn

1985 VN700
Saddle Bags
Small Sport Windshield
R/R moved
Home built coasters
Kaw touring front fender
1990 Fuel tank
Kenda Kruz 110/90-19 & 170/80-15 tires
NGK Iridium plugs
NGK plug caps and 7mm copper core wires.
Deer Whistles

My VN700 pic's

VROC #7740
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post #8 of 28 (permalink) Old 08-19-2008, 09:34 PM Thread Starter
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Well, i checked continuity of both wires from the ignitor to the coil, and both wires checked out fine. Are you suggesting to ground out the black wire?

Regards,
Pete in Gaithersburg, MD

1996, 6,000 miles
Relocated R/R, Corbin seat, Plexifairing III, Sunpro Voltmeter, Sears MF.
Xelement X840 Saddlebags

Last edited by PoggiPj; 08-19-2008 at 09:43 PM.
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post #9 of 28 (permalink) Old 08-20-2008, 01:07 AM
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That is all that is left, make sure that the coil has a good ground.

02 honda sabre 1100
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post #10 of 28 (permalink) Old 08-20-2008, 11:04 AM
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Quote:
Originally Posted by PoggiPj View Post
Well, i checked continuity of both wires from the ignitor to the coil, and both wires checked out fine. Are you suggesting to ground out the black wire?
No, just make sure the coil mount is good and clean. Even if you have continuity the wire may be broken en route somewhere. If the all the parts are working, then it has to be the connection between the parts.
Also are you sure you don't have the wires reversed on the coil?
You might want to check your ignition switch and kill button for a broken connection.

Glenn

1985 VN700
Saddle Bags
Small Sport Windshield
R/R moved
Home built coasters
Kaw touring front fender
1990 Fuel tank
Kenda Kruz 110/90-19 & 170/80-15 tires
NGK Iridium plugs
NGK plug caps and 7mm copper core wires.
Deer Whistles

My VN700 pic's

VROC #7740
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