No spark on right side of rear cylinder - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 05-07-2020, 04:46 PM Thread Starter
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No spark on right side of rear cylinder

Hello everyone,

I've been having an issue of hesitation at constant speeds sometimes. I assumed it was fuel delivery (and it still might be) however, I started pulling the spark plug wires off each individual spark plug to confirm a change in engine note, and when I did so with the rear, right cylinder, there was no change (this is the deep socket plug from the rear right). The left side of the rear cylinder is firing and there's a clear change in engine note when I remove that, or any of the two front spark plugs. Any ideas as to what can be causing this? I don't have the proper tool to remove the deep spark plug so I will have to wait until I can acquire that. Just looking to see if anyone has experienced this before?
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post #2 of 12 (permalink) Old 05-07-2020, 05:24 PM
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Almost has to be the plug, boot or wire. The other plug does fire on that cylinder?

2003-21k mi
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__________________________________________________ ____________
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post #3 of 12 (permalink) Old 05-07-2020, 06:21 PM
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could be coil as well. you can swap coils from front to rear (they are same part) to determine that

the coils have 2 high voltage towers, its possible for one to be bad and other work fine

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post #4 of 12 (permalink) Old 05-07-2020, 07:27 PM Thread Starter
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Just swapped that spark plug and the bike seems to be running great! All that running around and turns out it was just a spark plug. Thanks for your replies, in particular Spockster, who’s been helping me a lot through this. Time to enjoy the whip!
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post #5 of 12 (permalink) Old 05-07-2020, 07:56 PM
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You're welcome, hmm dead plug, maybe I should take a look at mine. She was running funny on the last rides, I know I have a boot arcing on the throttle cable. . . Guess I should fix that... ahem.

Was the plug broken burned or just dead?
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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 #6 of 12 (permalink) Old 05-07-2020, 09:06 PM
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Quote:
Originally Posted by Spockster View Post
I know I have a boot arcing on the throttle cable. . .
Glad I wasn't the only one who procrastinated on repairing that!
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post #7 of 12 (permalink) Old 05-07-2020, 09:25 PM
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[quote=Spockster;1286527] I know I have a boot arcing on the throttle cable. . . Guess I should fix that... ahem.


Quote:
Originally Posted by michiganteddybear View Post
Glad I wasn't the only one who procrastinated on repairing that!
That is funny……… off subject but my string trimmer was doing that, keep zapping me in the fore arm

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post #8 of 12 (permalink) Old 05-07-2020, 09:51 PM Thread Starter
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The mechanic helped me out because I didn’t have the deep socket to pull it out, but he held it against the engine and it was sparking, looked yellow’ish. The plug was also different than the other plugs (easier ones to pull out). Not sure what the deep plug on the front cylinder is but I need to find someone w a spark plug tool so I can pull it. Dealer wanted $25 labor to change the other 3 and I thought that was ridiculous, just bought some replacement plugs and left.
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post #9 of 12 (permalink) Old 05-08-2020, 12:43 AM
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Part numbers for the thinwall plug socket are in some posts here. The factory tool kit sockets should work, I ended up with a drawer full.

Proof I'm not turning enough wrenches, Im not seeing bad plugs.

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 #10 of 12 (permalink) Old 05-08-2020, 12:49 AM
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Quote:
Originally Posted by michiganteddybear View Post
could be coil as well. you can swap coils from front to rear (they are same part) to determine that

the coils have 2 high voltage towers, its possible for one to be bad and other work fine
Did not know that, and I think I knew about my boot arcing in 2018, maybe '17, talk about procrastinating.

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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