Stumbling at mid throttle to WOT - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 10 (permalink) Old 05-24-2010, 12:09 AM Thread Starter
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Exclamation Stumbling at mid throttle to WOT

Just finished reinstalling my carbs today after a good cleaning, and took the bike for a short ride. The bike seems to be running much better than before the cleaning.

Now, however, I'm dealing with another issue. A few minutes into the ride I attempted to push the bike a little, to no avail. In any gear, the bike is fine when using 0 to mid throttle. The problem begins under harder acceleration. The best way to describe what the bike is doing is stumbling/bogging down/sputtering. It seems comparible to an uneven two step.

What could be causing this issue?

Ideas that I had are...

a problem with the floats or a float causing the float chamber/jet chamber to not fill with fuel correctly

a problem with the main jets


I'd appreciate any input or past experience! I've searched as much as I can handle, and am not coming up with any solutions, nor do I have a solid plan of attack at this point.

Thanks!
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post #2 of 10 (permalink) Old 05-24-2010, 12:22 AM
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Did you get the hose that goes into the right ear (air filter housing) connected to the carb properly? If not, it can cause symptoms similar to what you describe. Ditto if the hose bottoms out on the inside of the housing. Cutting the end of the hose at a 45 degree prevents bottoming out.

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post #3 of 10 (permalink) Old 05-24-2010, 12:26 AM
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post #4 of 10 (permalink) Old 05-24-2010, 01:21 PM
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Hello. I am a new member. Since you are dicussing carbs, do I need to rejet if I get the V and H exhaust system? Thanks Tero
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post #5 of 10 (permalink) Old 05-24-2010, 02:51 PM
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Usually no. If you live on top of a mountain, maybe. What's your altitude?

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post #6 of 10 (permalink) Old 05-25-2010, 10:13 AM
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Good Morning, I am at 500-1000 ft. I am in Paso Robles, CA. Hot and dry most of the year, but only 45 mins from Morro Bay.
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post #7 of 10 (permalink) Old 05-25-2010, 10:16 AM
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Good Morning, I am at 500 ft. On the central coast of CA. Usually hot and dry, but only 45 mins from Morro Bay.
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post #8 of 10 (permalink) Old 05-25-2010, 10:17 AM
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Quote:
Originally Posted by tero2010 View Post
Good Morning, I am at 500 ft. On the central coast of CA. Usually hot and dry, but only 45 mins from Morro Bay.
You should be fine with stock carb jets and V&H exhaust then...

Fergy
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2002 VN1500 Classic
Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
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post #9 of 10 (permalink) Old 05-25-2010, 10:53 AM Thread Starter
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Thanks for the actual responses to my question. I was able to get the problem solved. It turns out that it indeed was the carb vent line bottoming out against the back of the right airbox. I got it cut at an angle and repositioned it under the gas tank. The bike is now running better than ever.
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post #10 of 10 (permalink) Old 05-25-2010, 11:07 AM
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Sweet!

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Rusty Tank Cleaning!
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