Engine stops, waits, starts again??? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 06-05-2009, 03:05 PM Thread Starter
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Engine stops, waits, starts again???

Wondering if any of you have had this happen? Twice in the last month the bike has started missing bad, running really rough, then stopping. It turns over, but won't run. Wait for a couple of minutes, it starts up and runs fine. The first time I thought someone had turned off the petcock and I had run out of gas, but the last time it happened I filled and only got in 2 gallons, so that's not it.

Any ideas from all you experienced riders out there???

Dudley

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post #2 of 10 (permalink) Old 06-05-2009, 08:52 PM
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That sounds like what I have seen mentioned on here before a lot... Seems that the tank vent in the fill cap gets stopped up and creates a vaccum, sometime when it does it, open the gas cap and let in some air, then try to start it, if that is the problem it should start...
Someone will explain it better later...
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post #3 of 10 (permalink) Old 06-05-2009, 10:12 PM
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Yep, happens enough I call it the Phanton Gas Syndrome.

The popular mentioned fix is to keep a spare key in the gas cap and open it up at the first sign of trouble. It always seems to happen around the time the bike is just getting near the reserve line. (about 2 gallons down)

I think someone here has a post about altering the vent hole in the cap to make it bigger, but I do not recall if they ever reported that it solved the problem. ...which can seem to come and go at almost any time.

It happened to me once the first month I got my bike...then it did not happen again until 5 years later, (the last ride I took before I sold the bike)

I suggest using Seafoam every other tank and trying to keep the tank topped off as much as possible.

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post #4 of 10 (permalink) Old 06-05-2009, 10:55 PM
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happened to me just last month...all is going well ahve rode the bike 75 miles or so turn it off it sets in the sun for about two hours starts great but only gets me about 1/2 mile down the road and dies deader than a hammer ...I open up the gas lid and it starts and runs like a dream......a buddy has a Honda Shadow and he says his will do the same thing if its in the sun for any length of time.....
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post #5 of 10 (permalink) Old 06-06-2009, 07:06 AM
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It's happened to me several times, a couple weeks ago it did it repeatedly within a 2 mile stretch of road which was something new for this bike. Prior to that it only happened when the bike sat in the sun all day, and I'd start it and only let it "warm up" for a minute or two before riding.

The only common thread in my experiences has been the amount of gas in the tank, and like KM mentioned, it's always happened when the gauge is reading at/near the reserve line.

I haven't spent any time trying to find and fix the issue, I just do like KM posted and refill the tank sooner.
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post #6 of 10 (permalink) Old 06-06-2009, 02:48 PM
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I know that at least one member described taking the cap off and dismantling it. He then drilled the vent disc out one size with a TINY bit. I just tried searching for it, but must not be using the right words, because I couldn`t find it.

As others have previously mentioned, I too would pour in some Seafoam and ride with a spare key in the tank lock, to be opened quickly while riding, if it starts to stall. Then check, clean or drill out the cap vent when time allows.

You might check the carburator vent hose going to the right "ear" (airbox), and make sure that it isn`t bottomed out. Cut the end off at a 45* angle so that it can`t be plugged if it is pushed too far into the airbox.

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post #7 of 10 (permalink) Old 06-06-2009, 02:49 PM
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Sounds alot like what they call "Vapor Lock"

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post #8 of 10 (permalink) Old 06-08-2009, 11:21 AM Thread Starter
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Thanks, guys. I'll give that a try. It did seem to happen at roughly the same amount of fuel each time, so that may be it.

Dudley

2003 VN 750 "T'Pol"
30k miles
New stator
R/R relocated
Memphis Shades windshield
Custom mirrors
Iridium plugs
Highway pegs
VN750.com radiator cover
Engine guard
Luggage Rack
Jardine slash-cut exhaust
Turn signals relocated
Ram GPS mount
12 volt power outlet
Airhawk II seat cushion
Floor boards
Tank bib
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post #9 of 10 (permalink) Old 06-10-2009, 01:13 AM
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https://www.vn750.com/forum/showthread.php?t=7428

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post #10 of 10 (permalink) Old 06-10-2009, 01:12 PM
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You could also get an air hose with the soft tip and blow the line out. But do it from the top or you'll blow that tiny O ring to hell. If you want to be Uber anal about it, you could squirt some carb cleaner into the hole and let it run out for a minute or so then blow it out.

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