Carb. probs. only firing on one cylinder. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 7 (permalink) Old 05-06-2008, 06:47 PM Thread Starter
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Unhappy Carb. probs. only firing on one cylinder.

I put on new fuel hoses today. the old ones had clear fuel filters on them. Now It's only running on one cylinder. (front cylinder not working)

I noticed that the black square thing on the bottom of the tank has a place to connect a hose, but no hose is connected. Should there be a hose?
I foun a hose that sticks up between the carbs that is not connected to anything. when I plug that hose with it running, the idle speeds up but as soon as I give it gas, it dies.

1994 Vulcan 750 bought Nov. 07 w/ 14,000 mi.
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Last edited by mr_embrey; 05-06-2008 at 06:52 PM.
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post #2 of 7 (permalink) Old 05-06-2008, 08:14 PM
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I really don't mean to interrupt this, and what I'm gonna say won't help you at all, but a "definitive answer" on that hose would be really helpful. I've seen all over this site, some say it goes on the right ear, and some say the square plate on the underside of the gas tank. (My Clymers says the right ear.)

When I just pulled my tank and carbs, my hose was connected to that plate under the tank, and my bike ran fine like that. (as fine as it could with my jacked up carbs anyway)
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On a note about your issue, last time I went thru a dead cylinder thing, is was just a spark plug that quit, but these bikes have two each, I can't imagine two would die at once.
And I would think if you're getting gas into the carb, then it would likely be getting into the engine, which brings us back to spark issues....

You said you put on new fuel hoses; any chance the one is kinked/folded somewhere maybe? I can't think of a thing that would be different if all you did was change a hose, so then it's either really bad timing, or simply an issue with that one hose.

Last edited by 750Doug; 05-06-2008 at 08:19 PM.
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post #3 of 7 (permalink) Old 05-06-2008, 08:27 PM Thread Starter
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I went back out and unbolted the tank to look around. I didn't find anything so I started it to see if I could figure something out. It started rough and a few seconds later it roared to life. Must have been a kinked hose or something.

Now I have a backfiring problem. I have already marbled and backed out those screws to 3 1/4 turn or so.

When you marble, all you do is put marbles in the vac lines going to the reed valves, right?

1994 Vulcan 750 bought Nov. 07 w/ 14,000 mi.
Custom 3" rear lowering brackets
TOC ACCT springs
Marbled
Horn relocation
Fork bag
Leather front mud flap
NKG irridium plugs
Bad ass billet comet mirrors
Mini turn signals
MF AGM BikeMaster battery (200cca)
Kuryakyn handle grips
Highway Hawk coolant res. cover
Jardine Rumblers

16,600 mi. and counting

VERY NICE!

"That's a negative ghostrider, the pattern is full."

Last edited by mr_embrey; 05-06-2008 at 08:35 PM.
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post #4 of 7 (permalink) Old 05-06-2008, 09:01 PM
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And plug off the carb vacuum line that it all ties into

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post #5 of 7 (permalink) Old 05-06-2008, 11:09 PM Thread Starter
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Quote:
Originally Posted by wkrizan View Post
And plug off the carb vacuum line that it all ties into
where is this located?

1994 Vulcan 750 bought Nov. 07 w/ 14,000 mi.
Custom 3" rear lowering brackets
TOC ACCT springs
Marbled
Horn relocation
Fork bag
Leather front mud flap
NKG irridium plugs
Bad ass billet comet mirrors
Mini turn signals
MF AGM BikeMaster battery (200cca)
Kuryakyn handle grips
Highway Hawk coolant res. cover
Jardine Rumblers

16,600 mi. and counting

VERY NICE!

"That's a negative ghostrider, the pattern is full."
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post #6 of 7 (permalink) Old 05-06-2008, 11:43 PM
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Quote:
Originally Posted by mr_embrey View Post
where is this located?
You will find a skinny vac hose running across the top of the rear cylynder(from the rear of the gas tank) going to the right hand side carb. Block it off just under the tank

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post #7 of 7 (permalink) Old 05-06-2008, 11:44 PM Thread Starter
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Thanks.

1994 Vulcan 750 bought Nov. 07 w/ 14,000 mi.
Custom 3" rear lowering brackets
TOC ACCT springs
Marbled
Horn relocation
Fork bag
Leather front mud flap
NKG irridium plugs
Bad ass billet comet mirrors
Mini turn signals
MF AGM BikeMaster battery (200cca)
Kuryakyn handle grips
Highway Hawk coolant res. cover
Jardine Rumblers

16,600 mi. and counting

VERY NICE!

"That's a negative ghostrider, the pattern is full."
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