1986 vn slow cranking - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 02-16-2014, 06:57 AM Thread Starter
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1986 vn slow cranking

g'day
rebuilt a 1986 vn 750 bcant get to start.cranks slow.take out a plug in each cylinder and cranks freely.replaced jumper coils.ignition coil,main coils.good spark.can get cylinders to pop.HELP please.timing good
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post #2 of 7 (permalink) Old 02-16-2014, 07:15 AM
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weak battery is likely, or a bad ground connection. Possibly a starter problem as well.

with the plugs removed, its relatively easy to crank the engine over. put the plugs in, and the effort increases a LOT. I suspect battery or connection problem, because without the plugs, it the starter wont pull as many amps (battery can supply enough, or the suspect connection is allowing enough amperage to flow). Put the plugs in, and the starter will draw in excess of 200 amps, and the battery and all associated cables and connection need to be top notch to enable that much current to flow properly.
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post #3 of 7 (permalink) Old 02-16-2014, 02:23 PM
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Jump it with a car battery. If still to slow, check starter wire. Clean it with sand paper. Bypass celinoid. Just a few thoughts.

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post #4 of 7 (permalink) Old 02-16-2014, 06:29 PM
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Dont run the car when jumping though....it can fry the electrics....
If you have manual cam chain tensioners on it, could be too tight....



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post #5 of 7 (permalink) Old 02-16-2014, 06:32 PM
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X2 - Don't jump it with the car running, it can fry the R/R pretty quick.

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post #6 of 7 (permalink) Old 02-16-2014, 06:34 PM
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...beat ya to it, hoss....



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post #7 of 7 (permalink) Old 08-18-2018, 02:02 PM
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I'm literally having this exact problem now, did anyone ever solve this?
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