Question about 1998 kawasaki VN 1500 Vulcan Classic

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1998 vulcan A12 idle problem,runs OK,spark on fronr cyl weak, misses in idle, got manual checked all wiring and sensor, swapped coils, IC does not check out by the manual, idle adjustment critical - not smooth, checked most hoses-please help

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  • hrepich1 Aug 02, 2009

    Battery is good, put charger on it while running-no difference. Both front sparkplugs are darker than rear ones but no oil on them. Used carb cleaners, enzimes etc.-still the same. How do I check out the IC? Is the book right or wrong. Can I swap IC input or output to move the problem to rear Cyl. Wish something would crap out for good so I could fix it. I will try some shops with a scope to shoot problem. I think I have a weak spark to front Cyl.--Or it could be the carb?

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Not sure if I can solve the problem, but I can tell you what happened to me.My rear plugs were sooting up constantly indicating a rich mixture - I replaced the air filters, and even fitted a crankcase breather (somebody told me it might help). I found that Iridium plugs worked better for a while, but they sooted up to eventually causing it to stutter.Turned out to be the carbs - there is a vacuum diaphragm in them which has a kind of rubber coating (silly thing to put near petrol really) anyway mine broke down leaving a sort of mesh diaphragm - so it was basically pulling more fuel through than it should when idling - if you take off the botom chamber of the carbs and you have litle bits in it then thats your problem too.

Posted on Aug 09, 2009

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Make sure you have new plugs and verify battery is good.

Posted on Aug 02, 2009

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