Stalling - losing spark - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 20 (permalink) Old 06-05-2010, 11:30 PM Thread Starter
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Stalling - losing spark

I finally got the bike legal went to ride it home today. After 10 miles at 65-70 mph I got off at my exit the bike stalled and I had no spark. all the lights worked the starter turned over but all it would do is flood and backfire. after sitting for 10 to 15 mins and some cranking with the petcock off. the bike started right up. could this be an igniter issue. this is the second time it has done this to me. any help would be appreciated.


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post #2 of 20 (permalink) Old 06-05-2010, 11:56 PM
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Could it be the Phantom Out of Gas Syndrome (POGS)?

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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post #3 of 20 (permalink) Old 06-06-2010, 12:03 AM Thread Starter
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no dealt with that a couple of years ago gas cap vents straight to atmosphere it will flood if i keep cranking the backfires sound like gunshots i just have no spark.


34k so far
VN750.com member #613
Keep the shiny side up
coastered
de-goat and baffles removed
jetted 42-150 2 shims
Earshaved with unifilters
inside of tank coated
spline lube
long Beach Blue Pearl Paint 4/07
Shindengen FH012AA r/r
TPE stator
Exide sc30lfa Battery 28ah 445cca
Saddlemen saddlebags
2001 HD fatboy solo seat
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post #4 of 20 (permalink) Old 06-06-2010, 12:19 AM
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Sounds like your Float/Floats is/are sticking open and Your flooding out. Next time tap your carbs and see if it starts up faster.

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Originally Posted by vulcanjoe View Post
I finally got the bike legal went to ride it home today. After 10 miles at 65-70 mph I got off at my exit the bike stalled and I had no spark. all the lights worked the starter turned over but all it would do is flood and backfire. after sitting for 10 to 15 mins and some cranking with the petcock off. the bike started right up. could this be an igniter issue. this is the second time it has done this to me. any help would be appreciated.

JaY



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2002 VN750 Vulcan
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Pick-up Coils Gapped at .018"
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post #5 of 20 (permalink) Old 06-06-2010, 01:48 AM Thread Starter
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its not a fuel issue I have no spark when it shuts down thats why it floods when i keep cranking it. anything will flood if there is no spark to burn whats coming in reason i believe igniter is that there is no spark in either cylinder. then after time to sit and cool down it fires right up. i cannot duplicate it in the garage it only does it after high speed crusing.


34k so far
VN750.com member #613
Keep the shiny side up
coastered
de-goat and baffles removed
jetted 42-150 2 shims
Earshaved with unifilters
inside of tank coated
spline lube
long Beach Blue Pearl Paint 4/07
Shindengen FH012AA r/r
TPE stator
Exide sc30lfa Battery 28ah 445cca
Saddlemen saddlebags
2001 HD fatboy solo seat
Custom taillight & rear turn signals
Fergy's coil relay mod
Fiamm El-Grande high/low tone horns
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post #6 of 20 (permalink) Old 06-06-2010, 03:54 AM
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NO Your Wrong.............

For gas to Ignite it has to be in a Gaseous form with the float sticking open it is letting as much fuel pour through when your slowing down as when your running fast. But when you slow down, too much fuel is coming through for it to ignite so it dies. So as you keep cranking more fuel is added, your still firing but it can't ignite because too much Liquid. As it sits the liquid drains and that's why it starts.

You need to check your oil and see if your level is up and if it smells like gas.


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Originally Posted by vulcanjoe View Post
its not a fuel issue I have no spark when it shuts down thats why it floods when i keep cranking it. anything will flood if there is no spark to burn whats coming in reason i believe igniter is that there is no spark in either cylinder. then after time to sit and cool down it fires right up. i cannot duplicate it in the garage it only does it after high speed crusing.

JaY



"Veronica"
2002 VN750 Vulcan
Rebuilt Engine
ACCTs lubed w/TOC Springs
Pick-up Coils Gapped at .018"
Splines Lubed
Deka MF AGM EXT15L Battery
NGK Iridium IX Spark Plugs
R/R Relocation Fix
New Rear Rack
Stock Seat Repadded
Ext-BackRest
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post #7 of 20 (permalink) Old 06-06-2010, 09:45 AM
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I agree with jt. A flooded carb will make it seem like there is no spark but when it back fires it is igniting the fuel. When it does this again pull a plug and if it is wet it is flooding out. If it is dry then you can check for spark.

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post #8 of 20 (permalink) Old 06-06-2010, 10:07 AM
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i think the ? needs asking to clarify, have you verified no spark? i think the assumption is that flooding is causing the lack of spark but if spark is absent first then flooding will follow. sounds to me like either the coils or igniter are getting hot and giving up till you let em cool down. usually a sign of impending failure in ignition electronics in any vehicle. just sayin. good luck with it.
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post #9 of 20 (permalink) Old 06-06-2010, 10:24 AM
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That's pretty much what i said. "When it does it again pull the plug to see if it is wet, but if it is dry then check for spark" That would be the best way to diagnose the problem when it happens. Were he can't get it to do this in the garage. That will let him know where to go from there, instead of troubleshooting a bunch of things.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #10 of 20 (permalink) Old 06-06-2010, 10:38 AM
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I agree Mitch. We need to verify if there's spark. VulcanJoe, I don't see what year your bike is, so this statement might not apply: This sounds like the hot start problem a lot of us have dealt with. I'm sure you have an MF battery in the bike, right? Of course you've been a member here longer than I so it is possible that you have an old MF battery that needs to be replaced. Again, I'm just thinking out loud... I'd check the battery voltage with the key OFF. If it is 12.5v then I'd check the coil wiring to see if you're getting a rather large drop off when the key is turned to ON. Check the red coil power wire with the key ON with each coil. If it is quite a bit lower, like 11v or so, then you have some weakened wiring going to your coils. You're probably doing these tests on a cold bike. Imagine when things get heated up good that the voltage would probably drop some. I'm not saying that this is your problem, but from what you described, it sure could be. Check out the coil wire mod in my sig. It's worth at least testing for, whether you decide to mod the wiring or not.

Either thing, weak spark, or too much fuel, gives you a rich condition, and can give you the "wake the dead" backfiring on trying to start the bike when its hot. The fact that you said after you waited 15 minutes or so, the bike started up, again sounds like it needed to cool a bit. Some claim that the r/r gets too hot and puts out lower voltage, which is why lots of us moved it out to the left passenger foot peg area. I did this and the coil wiring mod the same night and one or both of them solved my hot start/backfiring problem. It never did it again. Of course the coil wiring mod bypasses the r/r for coil power, and uses heavier gauge wire straight from the battery to the coil, via a relay, so more than likely, the coil wire mod did the trick. Just saying... something worth checking on.

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