Stumped mech idiots need some suggestions - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 08-14-2009, 11:37 AM Thread Starter
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Question Stumped mech idiots need some suggestions

My friend's VN750 is having a problem we can't seem to correct. I am looking for suggestions.

The bike starts and runs great, but every now and then it will just sputter and die, pretty much like it is running out of gas. Normally, after a few minutes (2 to 10 min usually) it will start right back up and run fine until the next sputter. Sometimes it is later the same day, but it has also gone a few hundred miles in between, so it is very sporadic. At first it seemed like it might be a temperature issue, doing this before it was fully warmed up, but that isn't true. It happened yesterday after 20 minutes of stop and go traffic.

It is a 95, coastered, marbled, de-goated. 3 weeks ago the carbs were removed and cleaned, and he runs Seafoam through regularly. He has a good sealed battery. The coils, plug wires and plugs were just replaced. The old plugs were all looking good. We checked the fuel lines and vaccuum hose. The gas cap vent is clear.

What's next to check? Could something this infrequent be electrical?

"Shutting up rarely leads to anything bad"

Joe McAdoo
Springfield, MO
[email protected]
VROC # 28175
-2004 Vulcan 1500 Classic 22000 miles
-1995 VN750 (Back home again!) 25000 miles
-1995 Suzuki DR350 Dualsport 1720 miles
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post #2 of 8 (permalink) Old 08-14-2009, 11:45 AM
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I know you said the gas cap vent is clear, but has he tried opening the gas cap to see if it will get the bike started without waiting? Did this problem begin after the carb cleaning, or was it doing it before too? Standard plugs or iridium?

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
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 8 (permalink) Old 08-14-2009, 12:16 PM Thread Starter
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This has been going on for a while, since last Summer. Cleaning the carbs was a local shop mechanic's suggested solution. He thought one of the floats might have been sticking.

Opening the gas cap after it dies doesn't seem to make any difference. It still takes a minute or two at least before it will restart.

"Shutting up rarely leads to anything bad"

Joe McAdoo
Springfield, MO
[email protected]
VROC # 28175
-2004 Vulcan 1500 Classic 22000 miles
-1995 VN750 (Back home again!) 25000 miles
-1995 Suzuki DR350 Dualsport 1720 miles
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post #4 of 8 (permalink) Old 08-14-2009, 12:46 PM
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Sounds a lot like the problem in this thread: https://www.vn750.com/forum/showthread.php?t=11799 Unfortunately we never learned what it was.

You could bypass the side stand switch and see if it helps.

If it is electrical at all, most likely it is a bad connection somewhere. Cracked solder joints often are temperature sensitive, and make a connection again when they cool down. You can find solder joints in the junction box and the IC igniter. A cracked joint looks like this:
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post #5 of 8 (permalink) Old 08-14-2009, 01:47 PM
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If it's an electrical short, I'd think the plugs would look OK. When you replaced the plugs, what did they look like? Fouled, lean, OK?

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
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 #6 of 8 (permalink) Old 08-14-2009, 02:29 PM
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i recomend uridium plugs and check to see if your carb vent is clear



Stator #3
MF AGM
DeGoated
Ears Shaved
R/R relocated
Rebuilt



She's worth her weight in GOLD
If u dont have it already Here is the Service Manual
How To Test the Stator
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post #7 of 8 (permalink) Old 08-14-2009, 02:57 PM Thread Starter
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The plugs were all a nice tan color, not burned, not wet, all the same.

We are riding this weekend. Maybe I'll get a first hand look. Hope it starts back up...

"Shutting up rarely leads to anything bad"

Joe McAdoo
Springfield, MO
[email protected]
VROC # 28175
-2004 Vulcan 1500 Classic 22000 miles
-1995 VN750 (Back home again!) 25000 miles
-1995 Suzuki DR350 Dualsport 1720 miles
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post #8 of 8 (permalink) Old 08-14-2009, 03:54 PM
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Have you checked the vent hose to the right side filter box, if it is cut streight it might be blocked off at the end... Dosen't exactly fit the symptoms but close... Cut the end of the tube on a 45* angle and put it back in place and you will know that is not it...
Also make sure it is not a California bike, they have 2 tubes that come out of the rear of the gas tank, where a Std. US Mod. only has 1 vent tube...
My 06 bought new in Tn. was a Cal. mod. and about drove me nuts till we found the problem and did away with it, then it was one hot sweet vn750...

Southern Central Tennessee.......
Now on the Dark Side......
Girl's Bike 09 Sporty xl 1200 Custom...33k + & clickin......
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09-xl1200 "C" Vivid Black, Cast wheels w/19" Frt., SE-Stage 1+, X14iEDs...
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