Front cylinder not firing - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 13 (permalink) Old 11-01-2011, 06:34 PM Thread Starter
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Front cylinder not firing

All the sudden my bike lost a ton of power. Didnt take much to figure out that the front cylinder isnt firing. pulled the plugs and put them on the rear coil, they r good. I assume the front coil is just bad, any other issues others have experienced that i may be over looking?

BTW the VN750 is a complete turd as a single cylinder 375 haha. Half throttle just to get into first without stalling.
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post #2 of 13 (permalink) Old 11-01-2011, 07:35 PM
If only it had 6th gear..
 
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Quote:
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BTW the VN750 is a complete turd as a single cylinder 375 haha. Half throttle just to get into first without stalling.
Lol. I can imagine.

I'd run a power wire to the front coil from the battery to confirm it's dead. Could be a connection are you sure there's no spark from the front? Nothing from the plugs while laying them against the engine to ground them? Were they wet? They should be actually if not sparking.

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post #3 of 13 (permalink) Old 11-01-2011, 07:43 PM
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Wiggle the conncting wires to the coil. Sometimes this helps.

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post #4 of 13 (permalink) Old 11-02-2011, 02:13 AM Thread Starter
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Ya the plugs were wet, and ive unplugged the coil connections and put them back on. I was runnin on the interstate for 20min and i was able to grab the header bare handed without letting go.
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post #5 of 13 (permalink) Old 11-02-2011, 11:22 PM
If only it had 6th gear..
 
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Yeah seems like you're on the right track with the coil, if the other tests don't reveal a connector issue.

Dave

Mods:
Jetted, shaved & coastered
Home made under-tank single filter
Converted ACCT's to manual (thanks wib714)
Dual vac lines on petcock (my cure for ticking)
LED tail/plate lights
Relocated helmet lock to license plate

Added stuff:
Customized hard bags w/ lights
Chrome levers
Hellcat windscreen
LED running lights
Home made 'Vita-Volt' meter
Foot rests on engine guard
Tunes

Hmm....she was on the back when we left.... ??
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post #6 of 13 (permalink) Old 11-03-2011, 06:04 PM
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Check this....

Check this too....
Behind the left side cover (the one that says Vulcan) are groups of wires coming from the engine. One set has 3 wires and 3 slip in connectors. These come from the stator. Check them first....its fast and easy...ine was messin up on front cyl too, and after messin with them it fired again. Also, seeing the close proximity to the belly and rear header, mine were melted some. I believe I'll need to make a good splice (soldered). But check there too. Worked for me.



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post #7 of 13 (permalink) Old 11-07-2011, 09:05 PM Thread Starter
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Picked up a coil from the junk yard, didnt work. Time to break out the meter and chase it down. Woulda dont that first if the coil wasnt only $10.
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post #8 of 13 (permalink) Old 11-08-2011, 10:14 AM
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After thouroughly checking wiring for damage or loose connection on the coils and IC ignitor, I would perform a resistance test on the pickup coils as well.
If you test at the connector plugged in at the IC ignitor, you can rule out wiring or connector contact issues as well.
While you have things unplugged, might as well inject some dielectric grease before re-assembly for good measure.

~~C8>

Last edited by ZCraggRatt; 11-08-2011 at 10:16 AM.
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post #9 of 13 (permalink) Old 11-08-2011, 10:36 AM
..have a vulcan good day!
 
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Previously, while on the interstate, I lost power, turned out no spark on the rear cylinder. Resolved problem replacing the Ignitor Box (behind right cover).
Good Luck
WilliamTech

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
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Splines Lubed - 11/4/2012 - MF AGM Battery
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Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #10 of 13 (permalink) Old 11-08-2011, 11:23 AM
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Quote:
Originally Posted by board917 View Post
Picked up a coil from the junk yard, didnt work. Time to break out the meter and chase it down. Woulda dont that first if the coil wasnt only $10.
Have you checked the wire to ground spark? Remove the spark plug put it on the plug wire and lay it on the engine. Crank the engine over and look and listen for a spark jump. If you get a spark your problem is some wheres else.

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