Bike Shuts Down - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 17 (permalink) Old 04-26-2007, 01:00 AM Thread Starter
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Bike Shuts Down

Hello, I've had my bike for two summers now and I've been having a recurring problem with the motor shutting off. It has never left me stranded so I never really worried to much and just kept riding . My little sister is going to take the MSF class and start riding it. I don't want it to shut off on her since she knows nothing about mechanics.
Here's what happens. The bike is always up to operating temperature, and a little hot when this happens. When cruising, not accelerating or deccelerating, the bike is running fine. Then, when I open up the throttle, the bike feels like it is running on one cylinder for a few seconds then cuts out completely as if out of fuel. However, there has always been right around half a tank of fuel. Sometimes the bikes starts right back up, sometimes I have to let it sit for 5-10 minutes. I go a little farther, and it happens again. It seems to be resolved by filling the gas tank. But sometimes this happens when the tank is 3/4 full, and sometimes with only 1/4 tank. Sometimes I'm giving it absolute hell in the twisties, sometimes cruising through town. I've changed plugs, used fuel treatment to clean carbs, and checked for disconnected/leaky vacuum lines. I am waiting for it to happen again so I can open the filler cap and see if maybe it is vapor locking. Other than that I am clueless. The bike is all original with 26,000 miles. Could it be plug wires, stator, condensor, voltage regulator, coil, points. Anything will be helpful. I am handy with auto engines, but know little about the electrical/charging/ignition systems on bikes. If you took the time read all this, thanx for reading. If you know anything about this, HELP! Thanx
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post #2 of 17 (permalink) Old 04-26-2007, 04:12 AM
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i am more of a car type myself- but it say you got a faulty fuel system-- i am betting a bad hose, loose connection- what have you- thats letting air into your supply- and you are loosing vacuum, causing a shortage of gas when you need to pull fuel the most.

so your engine calls for more, it gets less- engine goes to 1 or 2 cylinders then dies-- then your line is dry - so it cant start right away until it is able to suck more in-- enough to get it started and cruise ok, until you suck it dry again--

check your fuel filter! may just be all crudded up and not letting enough through for hard accel.

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post #3 of 17 (permalink) Old 04-26-2007, 05:24 AM
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Could also be a plugged vent, not letting the tank 'breath'

I've had similar situations, but usually happens just once during a ride (up to a couple/few hundred miles)
Sit a little bit, try to start it up, and all seems fine for the rest of the day.

Haven't figured it out yet.

Have you added any seafoam to the gas yet?


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post #4 of 17 (permalink) Old 04-26-2007, 08:59 AM Thread Starter
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I use sea foam in the first tank or two of every spring to clean out the stabilizer from the winter storage. Sounds like Hyperbuzzin is having the same problem. I think checking for vapor lock is a good solution, I am waiting to check that out. As for the fuel filter, where is that little guy? He's got 26,000 miles of crud and dirt.
Jet boy, do you know how to check to see if the carbs are dry? Which screw to remove to drain the bowl? I'll check that next time also. Thanks alot guys, already been helpful with tips.
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post #5 of 17 (permalink) Old 04-26-2007, 09:10 AM
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https://www.vn750.com/photopost/showp...ze=big&cat=548

Here's a pic from the Gallery showing where to locate your float bowl drain screws. I'm pretty sure that they take a very small Allen wrench, like maybe 3mm...

I don't have a fuel filter on mine, but I think Charlie (Easy Rector) put one on his bike. Check his Gallery posts - there may be a pic in there about where he located his.

C
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post #6 of 17 (permalink) Old 04-26-2007, 09:13 AM
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There are 2 small screens in the tank, remove the 2 bolts holding the petcock in and remove it. There they will be....

'92 Vn750

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post #7 of 17 (permalink) Old 04-26-2007, 09:13 AM
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Check your connections at both coils. You did not mention which cylinder is dying out but check all the plug wires. Unscrew the caps and remove the wires from the coil.....make sure that the wires are making a positive contact with the pins in the coil. If you see that there is more rubber at the end of the cables than wire, you can trim the ends and reinsert the cables. If it's not fuel then it has to be an electrical problem. K.I.S.S. is always the way to go.
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post #8 of 17 (permalink) Old 04-26-2007, 11:00 AM
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Quote:
Originally Posted by artman View Post
Check your connections at both coils. You did not mention which cylinder is dying out but check all the plug wires. Unscrew the caps and remove the wires from the coil.....make sure that the wires are making a positive contact with the pins in the coil. If you see that there is more rubber at the end of the cables than wire, you can trim the ends and reinsert the cables. If it's not fuel then it has to be an electrical problem. K.I.S.S. is always the way to go.
I understand the front coil is under the plastic collar in front of the gas tank. Can that collar be removed without removing anything else (eg., the gas tank)? And, where is the rear coil? Some of the photos in the shop manual are closeups and it's sometimes hard for me to figure out just where on the bike things are actually located. Thanks.

86' Vulcan, Stock & Lovin it!
Stator, R/R, splines lubed, ACCT's repl. at 25,200
Just turned 29,000 mi.

95' Vulcan, all stock, 9,700 mi.

John Spangler
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post #9 of 17 (permalink) Old 04-26-2007, 11:04 AM
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Quote:
Originally Posted by artman View Post
Check your connections at both coils. You did not mention which cylinder is dying out but check all the plug wires.
he didn't say cylinder was dying , he said it felt like it.

i had (still have ?) similar issue. i believe that at least in my case it is electrical - right before it quits the tach needle jumps allower the tach. someone on this forum found it is ignition switch contacts going bad and causing it. can't remember who it was. in his case in order to get home he had to bungie strap his key to put constant pressure on the switch .

just another opinion.

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post #10 of 17 (permalink) Old 04-26-2007, 11:30 AM
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If the tach was jumping before it shuts down, I'd agree it's electrical. If not, it sure sounds like fuel delivery. Carb vent hose bottoming out maybe, or not attached to the right ear like it's supposed to be causes similar problems. Tank vent plugged with a tiny bug or gum/varnish causes the same issue.

I'd recommend against using fuel stabilizer over the winter other than seafoam. I've read several accounts where stabil actually reacted with the gas/moisture and made it's own gummy residue and fouled things up. Seafoam is the best fuel stabilizer and will dissolve any varnish built up. It won't harm your non metal parts either.

Wouldn't hurt to give it a good 1/2 can does of seafoam along with checking other vents etc.

Fergy
Kyle, TX VN750.com member #707 VROC#19556
2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
Electrical Fault Finding Flowchart
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