2004 Vulcan missing at about 2,500 hundred rpm? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 04-29-2012, 09:01 AM Thread Starter
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2004 Vulcan missing at about 2,500 hundred rpm?

Hey everyone I'm. New to this forum but. I have a problem that's got me puzzled I. Have a 2004 Vulcan 750 with 11,000. Miles. On it. Win. U first crank it. Up it. Dosent start missing till it. Warms up I. Thought for. Assured. It. Was. The carbs. So I. Took. It to. A. Shop in. My. Area. That had a sonic cleaning mashine. Annnd. They took. Carbs. Off. Cleaned them. Thenn punt. Them bacck on. And synedd. Them. To. Because they said they. Were. Bad out. Off. Time. Got. The. Bike. Back. And. Still. Havve. Same problem punt. New. Spark plugs. In. Ass. Well Dodd. Not. Hhelp any. Some. Connection. Please. Help me



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post #2 of 6 (permalink) Old 04-29-2012, 09:13 AM
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Sounds like you have a clogged main jet in one or both carbs. The bike is running on the pilot jet to about 2500 rpm. After that the main jet kicks in also. I would take the bike back to whoever charged you to clean them. It doesn't miss when it's cold because you probably have the choke ( fuel enricher ) on and it is feeding more fuel to the carbs.

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post #3 of 6 (permalink) Old 04-29-2012, 12:09 PM Thread Starter
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Well what about the sparking system I've never heard of anybody replacing wires or anything like that and what kind of sparking system does the Vulcan 750 have is there never any maintenance u have to do to it


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post #4 of 6 (permalink) Old 04-29-2012, 10:45 PM
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Quote:
Originally Posted by joejo123 View Post
Well what about the sparking system I've never heard of anybody replacing wires or anything like that and what kind of sparking system does the Vulcan 750 have is there never any maintenance u have to do to it


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The vn750 has an electronic ignition system with no mechanical points or anything to adjust, or timing to set.

There are two ignition signal pickup coils behind the outer stator cover on the left side.
They feed a signal to the "ignitor" on the back of the battery box, which in turn signals the igniton coils.
The rear coil is bolted to the front of the battery box, and the front coil is under the left side neck cover.

Check the spark plug wires for poor insulation and "leakage" by starting the engine in a dark location and see if you can see any sparks around them.
Spraying a fine mist from a water bottle onto the wires may help find the miniature light show.

New wires have helped some members here. But if your bike was kept undercover or in a garage, a 2004 model is not really that old to be a prime candidate for damaged/deteriorated plug wires IMHO.

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post #5 of 6 (permalink) Old 04-29-2012, 10:58 PM
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Quote:
Originally Posted by joejo123 View Post
Hey everyone I'm. New to this forum but. I have a problem that's got me puzzled I. Have a 2004 Vulcan 750 with 11,000. Miles. On it. Win. U first crank it. Up it. Dosent start missing till it. Warms up I. Thought for. Assured. It. Was. The carbs. So I. Took. It to. A. Shop in. My. Area. That had a sonic cleaning mashine. Annnd. They took. Carbs. Off. Cleaned them. Thenn punt. Them bacck on. And synedd. Them. To. Because they said they. Were. Bad out. Off. Time. Got. The. Bike. Back. And. Still. Havve. Same problem punt. New. Spark plugs. In. Ass. Well Dodd. Not. Hhelp any. Some. Connection. Please. Help me



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post #6 of 6 (permalink) Old 04-30-2012, 01:06 PM
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The rpm range you just gave is the needles, the next question is are you rich or lean? Does it pull fine when cold but warm up and then starts missing? If so thats rich, have you done any changes to the bike? Were there any shims on the carb needles?

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