Trouble Starting Up - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 11 (permalink) Old 09-28-2011, 05:06 PM Thread Starter
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Trouble Starting Up

I finally have everything starting up nicely but I can not get it to stay going. After starting it up the engine will run while being revved up but once I let off the throttle it pretty much just dies. If the rpm's begin to drop and I rev it, the bike backfires a bit but will rev back up.
I ran into a lot of issues with this bike over the summer so this is what I have done up to this point. I rebuilt the starter, performed the coil wiring mods, replaced the oil, the spark plugs, cleaned the air filters (this mod was done before), and removed the air emission canister and hoses. Along the way I have disassembled the carbs and placed them back on due to a stuck float issue. I adjusted the screws according to what I read which was 2 and 1/2 turns out after fully setting them. It also seems like my cables need to be tightened to.
What adjustments do I need to make now to get everything perfect?

1985 Vulcan 700 - Fenrir

No regrets. Thats my motto, that and everybody wang chung tonight.
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post #2 of 11 (permalink) Old 09-28-2011, 05:28 PM
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Bummer... mine is a VN700A also but have never run into this issue... ponders.... Does the bike idle good or do you have to work the throttle to keep it running? Have ya checked for vacuum leaks? Is there any fuel drips from anywhere after the engine shuts down? Is one of the choke jets staying open or both? Are they all seated when the engine runs? At what rpm does the bike stall and quit running at? Different jets in the carbs run at different rpm changes.......


Vulcan #1 1993 - 28K
Vulcan #2 1999 - 26k
It All Comes Down To 3 Things:
#1 Fuel
#2 Spark
#3 Mechanical
Any One Fails - Then It Dont Run

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post #3 of 11 (permalink) Old 09-28-2011, 05:35 PM
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Sounds like a clogged pilot jet. Did you adjust the idle?

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post #4 of 11 (permalink) Old 09-28-2011, 05:41 PM Thread Starter
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It will run at idle just fine but after a minute or two of running the first time it will just cut out. It gets harder to get it to kick over after that. The exhaust seems to be wet and it seems like its spitting out extra fuel. On the right side of the carb I put a hose cap on the breather for the emission system. The choke seems like it is working preoperly. the middle hose from my petcock goes to the left side of the carb. What should i do?

1985 Vulcan 700 - Fenrir

No regrets. Thats my motto, that and everybody wang chung tonight.
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post #5 of 11 (permalink) Old 09-28-2011, 06:10 PM
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I have to agree with knifemaker on the jet causing a problem but also could be float setting problems.....


Vulcan #1 1993 - 28K
Vulcan #2 1999 - 26k
It All Comes Down To 3 Things:
#1 Fuel
#2 Spark
#3 Mechanical
Any One Fails - Then It Dont Run

____________________________________

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post #6 of 11 (permalink) Old 09-28-2011, 06:16 PM Thread Starter
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so if it is one of my jets should I just take the carbs off again and spray some cleaner on them? It kind of feels like one of them is flooding until it just dies off. I just need to know what i should go after next

1985 Vulcan 700 - Fenrir

No regrets. Thats my motto, that and everybody wang chung tonight.
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post #7 of 11 (permalink) Old 09-28-2011, 06:38 PM
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I had my carbs on & off 6 times in as many days and found that the front carb float needle valve rubber on the tip had harden up and was usless.... once i replaced the float needle valve all was good going down the widdle yellow brick road ! Be sure to check the jets to... one jet is so small you have to hold it up to a light to make sure you can see thru the small and i mean small hole.


Vulcan #1 1993 - 28K
Vulcan #2 1999 - 26k
It All Comes Down To 3 Things:
#1 Fuel
#2 Spark
#3 Mechanical
Any One Fails - Then It Dont Run

____________________________________

ANTICIPATED MODS:
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post #8 of 11 (permalink) Old 09-28-2011, 07:33 PM Thread Starter
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ok well I can get it to fire up now but I keep getting a cloud of white smoke from the front pipe. It can sit and run at idle but every once in a while its like it adjust itself, revs up to 3k rpms then stays like that's the new idle. Ive been playing with that pilot screw a bit and ran carb cleaner in reverse through the drain plug. I'm also getting a slow throttle response

1985 Vulcan 700 - Fenrir

No regrets. Thats my motto, that and everybody wang chung tonight.
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post #9 of 11 (permalink) Old 09-28-2011, 11:56 PM Thread Starter
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I took the tank off and trimmed my vacuum line that was bending and seemed like it may have been leaking. It started and ran well enough so I rode to the gas station to fill up in case it was bad gas or to much tank cleaner in there. It started fine and ran just great. Rode for a few hours only died twice once on a bump and then right after that but then nothing again. It still seems to be dragging a bit after the 3 or 4k rpms. Nothing serious it got up to 80mph fine just felt like it wasnt as responsive as it could or should be.

1985 Vulcan 700 - Fenrir

No regrets. Thats my motto, that and everybody wang chung tonight.
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post #10 of 11 (permalink) Old 09-29-2011, 12:26 AM
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Check your plugs see what that look like,, all of them. Flips a dime in the hat !!!


Vulcan #1 1993 - 28K
Vulcan #2 1999 - 26k
It All Comes Down To 3 Things:
#1 Fuel
#2 Spark
#3 Mechanical
Any One Fails - Then It Dont Run

____________________________________

ANTICIPATED MODS:
Build Fiberglass Fenders F/R
Mold & Cast New Turn Signals Lights
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