Gas in exhaust - running on one cylinder - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 17 (permalink) Old 11-01-2009, 01:33 AM Thread Starter
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Gas in exhaust - running on one cylinder

While I was riding on the freeway today I noticed that my bike was accelerating a little sluggishly, despite having 1/2 tank of fuel. When I got home I noticed that gas was leaking from the left exhaust where it meets the header, and the rear cylinder wasn't firing at all. The plugs were covered in unburnt fuel, even though both plugs are getting spark.

I've looked through the forum for a successful resolution to this problem, but without success. I seem to think it might be a carb problem... but what part of the carb? It seems that the rear cylinder is just being flooded with fuel, as if the needle in the main jet were stuck open.

Any thoughts?
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post #2 of 17 (permalink) Old 11-01-2009, 01:40 AM
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seafoam... seafoam....

is fuel lleaking past the float bowls???

no spark = unburnt fuel?? (check grounds connections voltage at coils and safty switched...) hust throwin things out there ...



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post #3 of 17 (permalink) Old 11-01-2009, 01:45 AM
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What year, miles, mods?
let the cyl. air out and try some new plugs first, but more than likely you have a float prob. The more info you give the better we can help.

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post #4 of 17 (permalink) Old 11-01-2009, 01:51 AM Thread Starter
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The plugs in the front cylinder are clean so I swapped them for the rear, which are the ones covered in gas (I cleaned them before reinstalling). I had the same problem. After running for 30second I rechecked the rear plugs and found that they were covered in unburnt fuel again.

The bike was running beautifully earlier today... and I had the carbs resynced about 2k miles ago. If it is a stuck float, is that something that I can access without pulling the carb off? It's been a long time since I've opened up a carb, so my memory is a little fuzzy....


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post #5 of 17 (permalink) Old 11-01-2009, 01:55 AM Thread Starter
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Quote:
Originally Posted by seebeeare View Post
seafoam... seafoam....

is fuel lleaking past the float bowls???

no spark = unburnt fuel?? (check grounds connections voltage at coils and safty switched...) hust throwin things out there ...
I had the same idea. Everything connected to the coil seems fine... both the wires for the front and rear cylinders have spark, it just seems that the rear cylinder is being flooded with fuel.

'94 VN740 at 10,000 miles
r/r relocate
acct rebuild
spline lube
jafrum saddle bags
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post #6 of 17 (permalink) Old 11-01-2009, 02:02 AM
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One thing to try is turning fuel off, drain rear carb( leave drain open), remove fuel line to rear carb, shoot some carb cleaner into the fuel inlet on the carb. Inspect the fuel lines for for cracks, if in doubt, replace them. if that doesn't work then I think you'll prob be pulling the carbs.
Also check to make sure the throttle slide isn't stuck open. Just pull the boot off and take a peek

"DAISY" 85 VN 700 19K
Owned since 09/12/09
Done list
Windshield
Marbled
Metal radiator drain plug
Removed exhaust baffles
TOCMAN. ACCT's
VN900 Seat

TO Do list
To much to list


VN900 seat on my VN700
https://www.vn750.com/forum/showthread.php?t=12903

Debaffling my stock pipes
https://www.vn750.com/forum/showthread.php?t=12756
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post #7 of 17 (permalink) Old 11-01-2009, 02:14 AM Thread Starter
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Quote:
Originally Posted by STUMPYSKAW View Post
One thing to try is turning fuel off, drain rear carb( leave drain open), remove fuel line to rear carb, shoot some carb cleaner into the fuel inlet on the carb. Inspect the fuel lines for for cracks, if in doubt, replace them. if that doesn't work then I think you'll prob be pulling the carbs.
Also check to make sure the throttle slide isn't stuck open. Just pull the boot off and take a peek
Thanks for the ideas. As soon as I get some sun light (tomorrow), I'll see what I can find.

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post #8 of 17 (permalink) Old 11-01-2009, 02:27 AM
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Quote:
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Thanks for the ideas. As soon as I get some sun light (tomorrow), I'll see what I can find.
You don't need sun light, a BIC lighter works just fine. LOL


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post #9 of 17 (permalink) Old 11-01-2009, 04:22 AM
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Quote:
Originally Posted by lance328 View Post
You don't need sun light, a BIC lighter works just fine. LOL
ROFL
bics work best for propane and natural gas leaks... (im 99 percent serious...)



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If u dont have it already Here is the Service Manual
How To Test the Stator
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post #10 of 17 (permalink) Old 11-01-2009, 06:09 AM
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Carb float.
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