spark plug arc - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 11 (permalink) Old 03-19-2008, 12:29 AM Thread Starter
 
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Exclamation spark plug arc

I was tinkerin around today and noticed a spark comeing from the spark plug cap. The throttle cable cover (spring lookin thing) was touching it. I fixed it by wrapping it with electrical tape, but what could have caused it? It was arcing through the rubber. Does any of this make sense?
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post #2 of 11 (permalink) Old 03-19-2008, 01:07 AM
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It does if the coating is worn. The insulated coating may have been worn down due to heat on that certain spot. Hehe you can always tell you need new wires if you grab one and get shocked!

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post #3 of 11 (permalink) Old 03-19-2008, 08:55 AM Thread Starter
 
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So, it should be Ok after I change the plug wires? Man, every time I look at it, I find something else that needs fixed or replaced.
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post #4 of 11 (permalink) Old 03-19-2008, 08:59 AM
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Yes, but atleast changing your wires is an easy thing to do!
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post #5 of 11 (permalink) Old 03-19-2008, 10:35 AM
 
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yep

Quote:
Originally Posted by mr_embrey View Post
I was tinkerin around today and noticed a spark comeing from the spark plug cap. The throttle cable cover (spring lookin thing) was touching it. I fixed it by wrapping it with electrical tape, but what could have caused it? It was arcing through the rubber. Does any of this make sense?
a big rule of electricity, it takes the path of the least resistance. it is a fact that there are more problems with current in the ground side of current than in the positive side, meaning you do not have a good solid ground, or you have a premature ground, a short. if you have a problem with power, and you establish power, you should immediately suspect and seek your problem on the ground side. this is not to say it could not be a broken wire (an open circuit on the positive side). ride safe
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post #6 of 11 (permalink) Old 03-19-2008, 12:02 PM
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Quote:
Originally Posted by mr_embrey View Post
I was tinkerin around today and noticed a spark comeing from the spark plug cap. The throttle cable cover (spring lookin thing) was touching it. I fixed it by wrapping it with electrical tape, but what could have caused it? It was arcing through the rubber. Does any of this make sense?
Your throttle cables are probably not routed right. They shouldn't be touching the boot. I only know because that's what happened to me. When the shop put my bike back together after an engine pull, they routed the cables to the wrong side of the air intake. We had a little VN750 get-together a couple of years back and I noticed that everybody else's cables were missing the boot by a half inch or more, but one of mine was rubbing on it. The cables should be passing aft of the tube connecting the filter to the engine. If they pass forward of it, they'll touch and eventually lead to arcing. Changing the wires and boot will only be a temporary fix.

'04 750A- and loving it!
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post #7 of 11 (permalink) Old 03-20-2008, 12:58 AM
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Quote:
Originally Posted by mr_embrey View Post
So, it should be Ok after I change the plug wires? Man, every time I look at it, I find something else that needs fixed or replaced.
Welcome to motorcycle ownership... Look at it this way, it's time you spend with your bike...


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2006 Harley Davidson Ultra Classic FLHTCUI ~ The Big Black Bitch ~ 26,000 miles.
2002 Kawasaki Nomad 1500 ~ The Red Dog ~ Traded in at 22,000 miles of smiles (purchased new 10/05 / Traded in 6/12).
1990 Kawasaki Vulcan 750 ~ Black Betty ~ 34,999.7 miles
VROC ~v~ 485
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post #8 of 11 (permalink) Old 03-20-2008, 08:31 PM
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Thanks Bulldog, I've had the same problem and couldn't figure out why since I tried to follow the pics in the books. I'll be rerouting after I repalce the stator later this spring.

Jim W
93 VN 750 "Ursula"
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post #9 of 11 (permalink) Old 03-20-2008, 09:47 PM
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Thanks Bulldog, I've had the same problem and couldn't figure out why since I tried to follow the pics in the books. I'll be rerouting after I repalce the stator later this spring.
There is no trick to the spark plug wiring. Go from the coils to the plug and leave enough wire to hang so it is not tight.


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2006 Harley Davidson Ultra Classic FLHTCUI ~ The Big Black Bitch ~ 26,000 miles.
2002 Kawasaki Nomad 1500 ~ The Red Dog ~ Traded in at 22,000 miles of smiles (purchased new 10/05 / Traded in 6/12).
1990 Kawasaki Vulcan 750 ~ Black Betty ~ 34,999.7 miles
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post #10 of 11 (permalink) Old 03-21-2008, 09:24 AM
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Quote:
Originally Posted by mr_embrey View Post
I was tinkerin around today and noticed a spark comeing from the spark plug cap. The throttle cable cover (spring lookin thing) was touching it. I fixed it by wrapping it with electrical tape, but what could have caused it? It was arcing through the rubber. Does any of this make sense?
On my 92 the hard plastic caps had deteriorated from age and the arc was coming from the seam where the two have were put together. If it is just the caps they are easy to replace as they screw on to the wires. You can get new ones from the dealer or search the archives as there are after market ones that fit.

PS Here is a link to a set of wires, caps and boots on eBay.

Bob

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Last edited by davros; 03-21-2008 at 09:29 AM. Reason: Found a link
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