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Old 07-27-2010, 11:38 PM   #1 (permalink)
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Default Signs of a bad spark plug wire??

I just got a used engine installed in my 87 zx750r. The guy who installed it is telling me 1 of my wires is bad... The spark plugs aren't that big of a deal considering they only cost a few bucks. But the wires are kinda expensive... Plus the wires weren't bad before the engine went (atleast I don't think they were)... I think he fucked up the wires... What are some signs of bad wires? And can a bike run with a bad wire?
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Old 07-27-2010, 11:43 PM   #2 (permalink)
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You can test the resistance of them with an ammeter. A good way I used to tell if I needed new wires in my drag racing days was to look under the hood at night time as cracked spark plug wires will arc off of anything metal they pass by

But generally checking the resistance of a wire is a good way to tell it's condition.
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Old 07-27-2010, 11:46 PM   #3 (permalink)
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Originally Posted by VeX View Post
You can test the resistance of them with an ammeter. A good way I used to tell if I needed new wires in my drag racing days was to look under the hood at night time as cracked spark plug wires will arc off of anything metal they pass by

But generally checking the resistance of a wire is a good way to tell it's condition.
Will a bike still run with one of the wires being bad??
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Old 07-27-2010, 11:50 PM   #4 (permalink)
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Pull the wire and see. If you stick a phillips screw driver into the spark plug boot and hold it so part of the metal of the screw driver is close to something metal like the engine block, and have a friend crank the engine (disconnect the other coils or pull the boots so the engine won't start) watch for sparks. Make sure not to have your hand anywhere near the metal part of the screwdriver when you do that though (it hurts).

That will simply tell you if the coil is working though and doesn't give you an indicator of the condition of the wire. Wires usually don't "go bad" but wear out. But if the wire is broken anywhere and current isn't getting through then the test to see if you can get a spark off of the block will show.
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Old 07-27-2010, 11:53 PM   #5 (permalink)
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umm checking the resistance isnt gunna tell you if its good spark plug wire is good it will till you that the wire is somewhat intacked but it maybe as little as one strand of wire. you can test the spark plug and wire to see if it sparks by taking the spark plug out still contected to the plug wire and get a jumper from the spark plug (thread part) to the chassis and crank, if you see spark your gettin spark
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