Rear cylinder spark plugs. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 06-26-2018, 10:17 PM Thread Starter
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Rear cylinder spark plugs.

When I remove one or both spark plug boots from the rear plugs the idle doesn't change, but when I remove just one from the front cylinder it bogs down and runs rough as expected. What would cause this? I'm so confused.

After doing some further investigating on here, I read a post that a shorted plug wire could cause a misfire/nofire situation. After reading that I remembered hearing a clicking noise coming from the rear cylinder that sounded like a spark plug clicking. Could this be the culprit?

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post #2 of 7 (permalink) Old 06-27-2018, 08:35 AM
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at idle I doubt removing one plug wire will cause any change in idle.

if your getting a drop when you pull a wire, I would suspect the coil, wires, plug associated with that cylinder

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post #3 of 7 (permalink) Old 06-27-2018, 09:59 AM
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Hmm, looks like the test shows the rear cylinder isn't making any power. "It's dead, Jim".

Check for spark and see if the plugs in the rear are wet or dry.

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post #4 of 7 (permalink) Old 06-27-2018, 10:55 AM
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Also, that clicking you're hearing could be the spark going somewhere it shouldn't, and not making the trip to the plugs. It certainly looks like the rear isn't firing at all. Once you get the rear firing, you'll have to lower the idle adjustment.

Maybe watch it run in the dark, look for sparks? Cracked rear coil or bad wires?

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post #5 of 7 (permalink) Old 06-27-2018, 08:23 PM Thread Starter
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Quote:
Originally Posted by Spockster View Post
Also, that clicking you're hearing could be the spark going somewhere it shouldn't, and not making the trip to the plugs. It certainly looks like the rear isn't firing at all. Once you get the rear firing, you'll have to lower the idle adjustment.

Maybe watch it run in the dark, look for sparks? Cracked rear coil or bad wires?
I'll check for misplaced spark when I get home. Most definitely will have to re-adjust the idle speed. If I've been misfiring/not firing since ive had the bike (just under a year) then I'm excited to see how the performance is when both are firing correctly. Gunna have to hold on for dear life.

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post #6 of 7 (permalink) Old 06-27-2018, 11:39 PM
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Be careful if you find the rest of the power. Somehow it works out to about 3x versus one cylinder.

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post #7 of 7 (permalink) Old 06-27-2018, 11:58 PM Thread Starter
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Just checked for stray sparkling and nothing. When a plug wire is removed it bogs slightly and runs a little rougher now. Guess it must have just been a fluke thing.

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