Bike won't start - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 03-03-2012, 07:53 PM Thread Starter
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Bike won't start

Every once on a while after I turn off my bike it wont start back only after 5 or 10 minutes later it just starts as if nothing ever happened, why is this?
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post #2 of 6 (permalink) Old 03-04-2012, 04:34 PM
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What type battery and spark plugs do you have in it? Several folks with hot start problems fixed them by installing an AGM battery (more CCAs) and iridium spark plugs.

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"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

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2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #3 of 6 (permalink) Old 03-04-2012, 04:36 PM
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Check your battery first. If it's not getting charged well it may not be providing enough spark. Sitting a few minutes without load may allow the bike to restart because the battery has recouped a little.
The connectors from the stator to the voltage regulator are sometimes a problem on these bikes, as is the voltage regulator itself.
There are several notes in the vulcan verses as to how to check the battery and charging system on the vn 750.
I'd start with electrical though, that seems to be the weak system on these cycles.
Keep us posted with findings, we will try to figure this out with you.

2005 VN 750
MF Battery
Plexistar windshield
.040 pilot jets.
Splines lubed 1955 mi.
Iridium plugs
Reset pickup coil gaps.
Metzeler ME=880s
Shindengen MOSFET RR
V & H Cruzers
Speed bleeders
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post #4 of 6 (permalink) Old 03-04-2012, 04:59 PM
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Another suggestion. When this happens again, open up the gas cap and try to start the engine. If it fires right up you have a gas cap vent problem or a bad vent line. A hot engine or hot temperature could be creating this problem.


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2001 Vulcan 750
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
decals removed
upgraded mirrors
Pic up coil mod done
All LED lighting
Upgraded Mosfet rectifier
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post #5 of 6 (permalink) Old 03-04-2012, 06:43 PM
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90% of all hot starting problems are solved by installing a good AGM maintaince free start with flite's suugestion first.

It helps when you post about a problem to give as much info as you can, so you should let us know what year your bike is, how many miles,and in this case, what type/brand battery you have, how old it is, how old are the spark plugs, if the gas tank is full with fresh gas, and how well the bike runs generally. The more info we have the better and faster you can get usefull suggestions for help.

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post #6 of 6 (permalink) Old 03-07-2012, 04:44 AM
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Vulcan 750s are known for hot starting problems. Mine has it, sometimes it takes 3-4 attempts to get it started, and before it starts, it will sputter and backfire a few times. I mean just a tiny pop or 2, not like a 12 gauge. Nobody has come up with a definitive answer for this, it may well be more than one thing, but I do believe it is a design issue, since virtually all of them are affected.

I believe the biggest problem is electrical. I think it is caused by a weak spark while the starter is turning over the motor. But, I don't necessarily blame it all on the ignition system. I believe the starting system is also at fault. I have noticed from the time I bought my first new Vulcan 750 in 1993 that the starter turned the engine over really slow. It's not the battery, though a weak battery would make it worse. I have connected batteries to it with enough CCA to start a 5000 hp top fuel dragster, and the starter still turns slow.

All my other bikes, and my former Ninja 500, turn over twice as fast, and all of them start right up, cold or hot, unless they have been sitting for a long time. I don't know what causes it to turn over so slowly. A 750cc engine should turn over 1000 rpm with just the starter. And if it would, I think the starting problem would go away.

I am a motorcyclist, NOT a biker.

1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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