Spark Plug Sleeve / Cam Chain Question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 09-23-2017, 02:08 PM Thread Starter
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Spark Plug Sleeve / Cam Chain Question

Hello!

I recently acquired an 86 Vulcan 750 with about 15,000 miles. I was working on the bike; oil change; spark plug; etc. and noticed that the existing spark plug sleeve on the left forward cylinder had been repaired and that there was a hole in it. I read here that it may have been caused by a loose cam chain.

However, when I reach into the hole, I don't feel anything in the way. Would I be able to tell when the engine is off this way if the damage had been done by a loose chain?

Or, for some other reason like a seized plug that someone put a hole through the sleeve trying to remove.

Thanks!
David
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post #2 of 7 (permalink) Old 09-23-2017, 02:48 PM
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Does the hole look like it's cut on the inside or outside? Wonder if using a thick wall spark plug socket could do that over time?

What else could rub there? A chain guide?

Need some engine drawings.

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 #3 of 7 (permalink) Old 09-23-2017, 02:52 PM Thread Starter
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I haven't pulled the sleeve yet. The replacement arrived today, so I might check it out a little later.
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post #4 of 7 (permalink) Old 09-23-2017, 03:04 PM
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If I recall, an axle nut fits the hex on the plug tube, if you need it.

I know I have to use force to get one of my sockets to grab the plug. I'm bearing down and twisting left to break the plug loose.

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 #5 of 7 (permalink) Old 09-23-2017, 03:44 PM Thread Starter
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I just replaced the plug sleeve.

I reached around inside the opening a bit before replacing it and it "seems" like the cam chain is tight enough to not be striking it.

It's tough to tell when it is running if the chain is making noise hitting the sleeve or not.

Do I just have to pull the sleeves after a few rides and check them for rubbing?

Thanks!
David
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post #6 of 7 (permalink) Old 09-23-2017, 06:27 PM
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Quote:
Originally Posted by magicdave2 View Post
I just replaced the plug sleeve.

I reached around inside the opening a bit before replacing it and it "seems" like the cam chain is tight enough to not be striking it.

It's tough to tell when it is running if the chain is making noise hitting the sleeve or not.

Do I just have to pull the sleeves after a few rides and check them for rubbing?

Thanks!
David
Yes, check it after running some and look for cuts.

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 #7 of 7 (permalink) Old 09-23-2017, 10:27 PM Thread Starter
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Sounds good. I'll update in a few weeks. I've got a petcock rebuild to do also!

Thanks!
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