help, I'm stumped - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 13 (permalink) Old 07-25-2006, 09:57 PM Thread Starter
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help, I'm stumped

Ok, a little help cuz I'm completely stumped.

The problem? A fuel smell when bike is at operating temperature. Not overpowering though...I associate this smell with a rich fuel mixture. The exhaust also has that "running rich" smell.

The good stuff:
1- Still getting same gas milage ~45mpg
2- all 4 spark plugs look great, light tan dry powdery look, (they have about 2000 miles on them since the engine rebuild so they should show it if there were problems)
3- all vent/vacuum hoses and evap canister are hooked up and correct with no leaks
4- exhaust system is all tight. (coasters installed, no popping)
5- hot start is right there
6- 'cold' morning start is good...a little choke action needed but not hard to start at all
7- idle is even and smooth at all operating temps
8- power is good all through engine rpm range, no bogging, choking, or particular flat spot, and responsive to throttle inputs at all rpm and gear selected
9- Fuel mix screws are set at 2 turns

Besides the smell the only other thing it does that I don't think it should is -- when fully heated up the idle speed doesn't fall all the way to 900, it sticks occassionally around 1200-1500.

Should I worry or is this nothing?
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post #2 of 13 (permalink) Old 07-26-2006, 12:51 AM
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There should be a float bowl overflow line, check to see if there is any sign of fuel on the end of the hose. Dust it and see if the dust is wet after a run.
If the float level is set just slightly high fuel can splash out and dribble down the tube. This would not impact performance at all. Only slightly effect mileage. But it would give a slight gas smell, with higher rpm vibrations.
I don't have a vn750 yet so I'm guessing about the overflow tube. My GS 500 Suzuki has a 2 into 1 overflow tube.
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post #3 of 13 (permalink) Old 07-26-2006, 07:46 AM
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My idle is usually around 1000 to 1100 rpm.

Ron from Jersey
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post #4 of 13 (permalink) Old 07-26-2006, 03:11 PM Thread Starter
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Well for lack of anything else to try, I leaned out the mixture 1/2 turn. The running rich smell is gone, but I'm getting a little exhaust popping. Might try putting back in 1/4 turn.
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post #5 of 13 (permalink) Old 07-27-2006, 07:11 AM
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Hi!

Quote:
Originally Posted by Imnohero
Besides the smell the only other thing it does that I don't think it should is -- when fully heated up the idle speed doesn't fall all the way to 900, it sticks occassionally around 1200-1500.

Should I worry or is this nothing?
If you have such RPM on hot engine it could be
that you have too lean mixture. This may be
caused by fake air in the intake system.
Check all air connections.

Regards!

Kanclerz
Kawa VN750 '92
Warsaw, Poland, Europe
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post #6 of 13 (permalink) Old 07-27-2006, 08:17 AM
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What the...? Hey, I'm the trouble maker here, buddy! Fake air...

My idle speed runs about 1200-1500. Book says something like 1100 or so. Fake book, that is.

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post #7 of 13 (permalink) Old 07-27-2006, 08:53 AM
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Quote:
Originally Posted by cegodsey
What the...? Hey, I'm the trouble maker here, buddy! Fake air...

My idle speed runs about 1200-1500. Book says something like 1100 or so. Fake book, that is.
If I'm wrong I'm sorry
"Fake air" - I don't know how to say it in english.
I mean that there is a hole somewere in air intake system.
The hole in the element like that one with 16065 number
on this picture:
http://glinki.com/?l=u5owg2
Is it "air leak" ?


Regards!

Kanclerz
Kawa VN750 '92
Warsaw, Poland, Europe

Last edited by kanclerz; 07-27-2006 at 09:08 AM.
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post #8 of 13 (permalink) Old 07-27-2006, 09:46 AM Thread Starter
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Well all the 'symptoms' have disappeared by leaning out the mixture. Though I did rich it up again by 1/4 turn. That put's me at 1 3/4 turns out. A little less that most folks, huh? But I guess that's what it was.
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post #9 of 13 (permalink) Old 07-27-2006, 12:15 PM
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Kanclerz - I figured it was a translation issue. It was too funny to pass up, I had to say something. My wife had to figure out the correct word. You are correct, the air is leaking or air leak.

What does your engine idle at?
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post #10 of 13 (permalink) Old 07-27-2006, 02:23 PM
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Sorta like passing gas eh?

--bye , bilyum--
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