Start Problem - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Where does this wire go?
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post #1 of 6 (permalink) Old 04-03-2018, 01:20 PM Thread Starter
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Start Problem

I have a 1994 Kawasaki Vulcan 750. The bike will crank over and start on a fully charged battery. Run the bike for half hour or so and shut down then attempt to start again the starter turns over slowly as if the battery was low on charge. Leave the bike to cool down for a while and it will start as though the battery is fully charged. Any suggestions or solutions to my problem. Not that experienced here with bike electronics so any help would be appreciated
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post #2 of 6 (permalink) Old 04-03-2018, 02:18 PM
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Welcome to the VN750 forum. (Someone will ask that you post an introductory post in the newbie thread)

I'm no expert, but I would measure the voltage at the starter at cranking cold versus hot. Need to know if it is an electrical issue or if it's mechanical. My experience leads me to think more mechanical because the starter solenoid would drop out on low voltage before the starter would drag like that. Unless the starter itself has an issue when it gets heated up from ambient engine heat.

I'm sure someone with more experience will chime in soon.

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post #3 of 6 (permalink) Old 04-04-2018, 12:05 AM
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Try searching the forums for 'hot start' threads. I know it's an issue that has been discussed at length.

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post #4 of 6 (permalink) Old 04-04-2018, 11:18 AM
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Since these starters are pretty bullet proof, I've rebuild one several times before realizing there isn't much to them and the parts are pretty solid, the problem is probably NOT the starter. Check all of the battery cables TOO the starter and to ground. They might be corroded and when they get hot, they resist too much. They are cheap to replace so why not just do it.

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post #5 of 6 (permalink) Old 04-04-2018, 12:14 PM
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It's quite possible for a worn starter to perform like that, starts just fine cold, turns slow or only clicks when it's hot. Have had many fail like that.

Need to check the battery voltage and load test it, check voltage draw during cold/hot cranking, charging voltage, and all the connections. Parts stores can load test your battery, it should have 200-250 amps.

If the starter, battery, and charging check out good, then you probably need to look at other "hot start" fixes.

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post #6 of 6 (permalink) Old 04-10-2018, 08:44 AM
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I have 2 Vulcan 750 a 1989 and a 1995. I have had same issue I upgraded plugs to iridium new wires . The hot restart would continue. Once I installed a new AGM battery problem gone. When bike is hot it seems like it needs more batt power to restart it. Compression may be higher in cylinders and heat expands things so perhaps that why compression is higher. I have found all Vulcan very sensitive to battery voltage . I also cleaned all terminals used di electric grease on all of them and made sure all frame grounds were bright and clean. Have had no issues since
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