Down a cylinder --- Help - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 13 (permalink) Old 11-06-2006, 04:24 PM Thread Starter
 
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Down a cylinder --- Help

Hi... Took a ride this morning and on my way home. I initially noticed a loss in power at 50MPH or so. It cleared up fairly quickly... or so I thought.

I came to a stop sign and when I was starting off from a stop, I was only running (barely) on one cylinder as long as I kept the revs up. Every once in a while, the other cylinder would fire and then quit.

I was close to home and made it there - at least I didn't get stranded. As soon as I stopped, the engine quit and I was unable to restart it - so I wasn't able to figure out which one was giving me the trouble.

After about 5 mins or so, I was able to restart and both cylinders are firing and the engine sounds fine. I didn't take it back out just in case..

Any folks out there have any idea where I should start looking?

Thanks in Advance,,

Bryan
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post #2 of 13 (permalink) Old 11-06-2006, 05:17 PM
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how old is the bike? my first guess would be spark plug wires. check continuity, and verify a strong spark to the front and rear cyl. also check the plugs to see what condition they are in. next on the list would be carb related. there is also a small possiability it could be the charging system, but that is an easy check.

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post #3 of 13 (permalink) Old 11-06-2006, 05:29 PM
 
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If I had to guess I would say it sounds like it could be a coil....not sure if theres a test for that other than checking spark.........anybody know?
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post #4 of 13 (permalink) Old 11-06-2006, 05:33 PM
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Also could be a fuel problem, how much is in the tank and have you used Seafoam? That is what my bike does when it starts to run out of gas, one cylender quits first ususlly the front.

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post #5 of 13 (permalink) Old 11-06-2006, 05:43 PM Thread Starter
 
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Thanks Guys.. The fuel gauge was showing 1/4 left and I thought it was fuel too and when it first happened, I switched to reserve with no luck.
The bike is a '93 - my first gut feel was a coil or plug wires. I'll check there first.

Thanks for the input

Bryan
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post #6 of 13 (permalink) Old 11-06-2006, 06:22 PM
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Start it up in the dark, you will be able to see if any of the plug wires are arcing.

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post #7 of 13 (permalink) Old 11-06-2006, 06:52 PM
 
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thats how I found mine....started it up at 4:15 am to go to work.
I had a GS750 with a bad coil..it would fire weak then sometimes good...the bike would actually launch forward on me when it did fire, was a trip riding thru town in traffic lol
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post #8 of 13 (permalink) Old 11-06-2006, 07:08 PM
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If you can figure out which cylinder it is, you can physically swap the coils and see if it is a coil going out. Although it could be a plug wire, we have two per cylinder, so the cylinder wouldn't give out entirely. I think. If swapping the coils doesn't fix the problem, then that leaves the plug wires and the IC igniter. This is assuming that the carbs are ok. Run some seafoam through it if you haven't already. Let it sit overnight with the fuel/seafoam mixture in the carbs.

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post #9 of 13 (permalink) Old 11-07-2006, 04:17 AM
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I've had something very similar to what you describe happen to me several times.
It'd happen once during a ride. I'd let it sit for a minute or two, then it'd fire up and run fine and wouldn't happen again for the remainder of a couple hundred mile ride.



Several folks here recommended opening the gas cap after it quit like that and listen for the sound of pressure releasing from the tank. Only problem is, it hasn't done it since I heard of that !?

Wish I could be of more help to ya, 'cause I know how frustrating it is when this happens.
Only thing I can say for sure, when my Vulcan did it, it always started after letting it sit a little while.

If ya do figure out what's causing your's to do it, please be sure to let us know.


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post #10 of 13 (permalink) Old 11-07-2006, 07:26 AM
 
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A maintenance free battery fixed most of my bikes misfiring.
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