At a loss. Front cylinder losses spark when warm - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 06-17-2016, 11:38 AM Thread Starter
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At a loss. Front cylinder losses spark when warm

Last fall I replaced stator, pickups. The bike ran great parked it for winter. Started it this spring let it idle till I warmed up,. Once warm the tachometer died and I lost spark in front cylinder. I cleaned connections for front ignition coil. Bike cooled started ran fine. Warmed up and it sputtered failed again. Tried once more. Blew rad hose under the gas tank. I replaced all hoses. Replaced with new OEM ignition coil today and the bike runs great till warm and then tach dies and no spark in front cylinder. If I leave it to cool down for a bit it run fine. It doesn't even get that hot before it acts up.The rear runs fine. Any clues would be great.
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post #2 of 7 (permalink) Old 06-17-2016, 02:50 PM
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No clue, but I'd go over all the electrical connections, especially the ones under the seat and in the headlight shell. Make sure you have a solid ground.

when the front cuts out, can you keep it running on the rear?

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post #3 of 7 (permalink) Old 06-17-2016, 03:26 PM
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as KM said, check the electrical connections.. dont over look the ones on the igniter..

Also, check the pickup coils.. the front one may have bad/corroded connection that fails when warm, and when that happens the associated cylinder looses spark. and in the case of the front cylinder loosing spark, the tach quits too

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post #4 of 7 (permalink) Old 06-17-2016, 05:01 PM Thread Starter
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Think I found the problem. Cleaned the connection in the cdi box. Think the coolant from that hose might have been dripping down and corroded the contacts. Seams to run good again. Everytime I have gone to sell the bike to someone something goes wrong. 3 times rad hose blows. (All are new now). Ground came loose ones. Stator died. Yes this bike loves my wallet the only thing is it runs great until the night I decide to sell it. I had already cleaned and sanded every ground.
Hopefully that is all it was. Thanks.
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post #5 of 7 (permalink) Old 06-18-2016, 07:56 AM Thread Starter
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Darn happened again this morning. Warmed up just a little. Rev'd it up to a bout 6500 and bike died front coil kick out
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post #6 of 7 (permalink) Old 06-18-2016, 08:22 PM
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I had a problem with the bike cutting to 1 cylinder occasionally but only when the engine was hot. Turned out to be a bad connection at the igniter.

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post #7 of 7 (permalink) Old 06-19-2016, 12:12 PM
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Quote:
Originally Posted by michiganteddybear View Post
as KM said, check the electrical connections.. dont over look the ones on the igniter..

Also, check the pickup coils.. the front one may have bad/corroded connection that fails when warm, and when that happens the associated cylinder looses spark. and in the case of the front cylinder loosing spark, the tach quits too
Relevant connections are the pickup coil (black, black and yellow wires for front coil), and the wire to the front ignition coil (black out of ignition coil ignitor box). Those would be the two culprits if you're losing the tachometer output. Of course the internals of the pickup coil or ignition coil ignitor could also be bad.

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