Spark Plug Blew Out - Vulcan 900 - Kawasaki Motorcycle Forums
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post #1 of 6 (permalink) Old 05-09-2017, 04:57 PM Thread Starter
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Spark Plug Blew Out - Vulcan 900

A buddy has a Vulcan 900 (2007 I think) that he said blew a spark plug on the rear. No clue how that is possible. Cannot get it started at all. He removed the rear valve cover, the valve shims and the exhaust. Trying to fix it, then gave up. Happened a year or so ago, been sitting ever since.

No idea how it happened or even if that is actually what happened. He said there was loud noise and it died. Went looking and found the plug was not in place and black/crusted. Can screw a new plug in, but will not fire up.

I have the opportunity to get the bike for next to nothing but do not want it unless it is a relatively inexpensive or relatively simple repair. I'm fairly good mechanically, but no pro.

Tests/suggestions?

2002 Vulcan 800 Classic
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post #2 of 6 (permalink) Old 05-09-2017, 07:52 PM
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Spark plugs usually blow out for 2 reasons:

1. Over torqued and threads stripped, or
2. Under torqued, spark plug move slightly and wear out threads.

You could probably use one of these;

++ TIME-SERT Official Threaded inserts for stripped threads, blown out sparkplugs,

or similar
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post #3 of 6 (permalink) Old 05-10-2017, 09:05 PM
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According to the post, a new spark plug can be screwed in. Do the threads hold and is the spark plug firmly seated as it ought to be?

Jim
'07 Vulcan 900 Classic LT

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post #4 of 6 (permalink) Old 05-17-2017, 04:25 PM Thread Starter
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I am uncertain what state they are in. Going to go check it out this weekend and see.

2002 Vulcan 800 Classic
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post #5 of 6 (permalink) Old 06-05-2017, 09:55 AM Thread Starter
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He decided to try and fix it with a helicoil.
Aside from the spark plug issue he scavenged parts for another bike.
So even if I got it for a deal, I'd have the fix the plug issue and replace various other parts.
Costs are adding up, no longer looking like a good deal.

I have an 800 that runs great, a 900 is not much of an upgrade so not really worth the hassle.
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2002 Vulcan 800 Classic
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post #6 of 6 (permalink) Old 06-05-2017, 10:29 AM
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Quote:
Originally Posted by MrMyles View Post
He decided to try and fix it with a helicoil.
Aside from the spark plug issue he scavenged parts for another bike.
So even if I got it for a deal, I'd have the fix the plug issue and replace various other parts.
Costs are adding up, no longer looking like a good deal.

I have an 800 that runs great, a 900 is not much of an upgrade so not really worth the hassle.
I agree. If I had a good running bike I'd pass on one like this 900 and take my time to find another one that won't be so much work and $$$.

Words aren't children and there's nothing wrong with killing them to clarify a point or keep the peace.
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