What could be causing this? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 6 (permalink) Old 04-29-2008, 08:51 PM Thread Starter
 
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What could be causing this?

My 750 idles great (no back fire when you crack the trottle) and runs smooth to about 4.000rpms . Then between 4,000 and 5,200 rpms it breaks up and after 5,200 rpms it smoothes out again and runs like a screamer. What could be causing this? Thanks for any help in getting this situation straightened out.


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post #2 of 6 (permalink) Old 04-30-2008, 04:47 AM
 
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Could be sticky floats in the carb
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post #3 of 6 (permalink) Old 04-30-2008, 12:14 PM
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Also check the tube in your right air filter (the ear) Could be the imfamous blocked tube stumble from the tube bottoming out against the case.

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1990 GL1500 (Ole Blue)
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post #4 of 6 (permalink) Old 04-30-2008, 12:35 PM
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You have a fuel induction problem. Its not a sticking float, but I would bet you have a clogged jet.

This bike would likely benifit from a carb disassemble and clean.

1990 Vulcan
------------------------------
Saturn Plum/55 Tbird red.
Accel Coils.Mangacore wires.Corbin Seat.
Cobra exhaust.Jetted to 1.1 lamda.
Wide levers,cushy grips, All steel lines....
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post #5 of 6 (permalink) Old 05-02-2008, 11:03 AM
 
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runs great at 1000rms anything above nothing

i just bought a 1994 vulcan 750, great deal but has been sitting since last summer. changed the plugs battery dumped old fuel, replaced with new and replaced fuel filters that ar a pain in the &*%$#. bike fires right up but when you give it any gas at all it chokes off. when i pull my carbs i am wondering if i should jet since it will be off and is there a rebuild kit or do you just take off clean and put back on

need help please
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post #6 of 6 (permalink) Old 05-02-2008, 11:40 AM
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Quote:
Originally Posted by VN75008 View Post
i just bought a 1994 vulcan 750, great deal but has been sitting since last summer. changed the plugs battery dumped old fuel, replaced with new and replaced fuel filters that ar a pain in the &*%$#. bike fires right up but when you give it any gas at all it chokes off. when i pull my carbs i am wondering if i should jet since it will be off and is there a rebuild kit or do you just take off clean and put back on

need help please
A good cleaning should fix that up, I wouldn't rejet unless you have to. Even sitting for a winter can cause the tiny little passages in carbs to plug up which can cause all kinds of problems

85 VN750 basketcase ( yes its a true 750, and no smog controls, its good to be Canadian)
It will have
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balanced
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looking for smoothbore sidedraft carbs
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