My thoughts on my problem - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Where does this wire go?
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post #1 of 8 (permalink) Old 04-10-2008, 06:31 PM Thread Starter
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My thoughts on my problem

I was riding earlier today, when suddenly i hear a pop under my seat, the next thing i know the bike dies. I start it back up to find that only the front cylinder is firing.i get it back home, remove the seat, to find battery acid everywhere, and the cap to battery popped, i believe that is where the pop sound came from. next thing i do is hook up brand new spark plugs to the back cylinder, no spark. everything else works electrically, but the back cylinder, which leads me to believe that the rear coil is bad. so here is my question, do you guys think my diagnosis is a pretty good assumption, I ordered a rear coil, so i should have it in a few days, and i plan on buying a new better quality battery. but as far as i am concerned it seems like the rear coil is the issue, because like i said, the bike will run on one cylinder, all electrical components works but no rear cylinder. just let me know what ya'll think.
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post #2 of 8 (permalink) Old 04-10-2008, 06:33 PM
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Ouch, but why did the battery pop? Is your stator and R/R over charging?


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post #3 of 8 (permalink) Old 04-10-2008, 06:43 PM Thread Starter
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its one of them cheapy walmart batts that has the six plugs all linked, it has come lose before, but this time it was almost all the way off.
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post #4 of 8 (permalink) Old 04-10-2008, 11:03 PM
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Well there's your first problem, Your not running a maintenance free battery. It really does make all the differance in the world with this bike. I'd suggest getting ahold of one. Auto zone is where I got mine & it's a gell cell. So even in the possiblility of a crack, no leak.
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post #5 of 8 (permalink) Old 04-11-2008, 03:17 AM
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I would recommend the Big Crank from It's the least expensive "quality" battery you can get. As for why the caps blew off, is your vent line kinked or clogged? The type of battery you have has to vent or it builds pressure, and pop! It could have cause a problem with you rear coil, but not likely. Perhaps the coil cause the problem with the battery. Hmmm? In any case, get rid of that battery and get a mf one. I, and everyone on this site will tell you it make a world of difference. It will be the best 60 bucks you spend on your bike. By the way, be sure to coat your bike with a mix of baking soda and water to get rid of the acid. Once you think it's cleaned up, clean it again. Baking soda is cheap....replacing rusted/corroded parts is not. Wash, rinse, wash, rinse....get it all and then get it all again. Paint any metal that is exposed from the acid. Good luck and I hope it works out for ya.
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post #6 of 8 (permalink) Old 04-18-2008, 10:50 AM Thread Starter
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well i got my ignition coil, and i put a round of plugs in, and man does my bike rip now. thanks for all the advice. now i just need to order a maintenance free battery
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post #7 of 8 (permalink) Old 04-18-2008, 11:50 AM
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Order one pronto too! I had a temporary walmart battery in mine while I was doing some work. The cap well didn't pop off, it exploded off, sending a spray of battery acid all over the bike and especially down my windshield. We were fast enough to wipe the bike down but the windshield had cloudy streaks running down the inside

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post #8 of 8 (permalink) Old 04-20-2008, 09:16 AM
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Patrick - I didn't have a battery explode on me, but I think I am having the same problem you were with the rear cyl not firing. Did you notice if the rear cyl would start working a higher RPMs or not at all? Mine kicks in around 4000 rpm and revs the bike up to 6000. Only way I can tell that I am able to get combustion at all. Also, where did you get your coil from? Thanks.
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