Bike turns off when i Roll the throttle - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 10-26-2010, 11:22 PM Thread Starter
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Bike turns off when i Roll the throttle

Am in the process of buying an 85' Vulcan 700 from a buddy who doesn't have time to work on it. He bought it as a project & is now passing it on to me. Bike starts, but you have to hold the choke. If you let go of the choke, the bike dies. & If the bike idles by itself, when you roll the throttle, it just shuts off. Is this just a simple problem where if you take the carb off & replace it, all will be well? Or is it something more? Any advice will help guys, thanks!
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post #2 of 6 (permalink) Old 10-26-2010, 11:53 PM
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Sounds like the carbs are dirty and need cleaning. You could first try draining the gas from the carbs and filling them with Sea Foam. Let sit 12-48 hours, drain Sea Foam from carbs, then add 1/2 can of Sea Foam to a tank of fresh gas. Repeat with another tankful mixed with Sea Foam if it hasn't fixed it. If that doesn't do the trick, it's time to pull the carbs. If you don't want to do it yourself, cleans them ultrasonically and replaces any damaged components for around $45 each carb plus parts and shipping.

Sea Foam is available at most WalMarts, auto parts stores, etc.

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post #3 of 6 (permalink) Old 10-26-2010, 11:56 PM
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Carbs are probably a good place to start, pull them out (easier said than done) and give them a good cleaning and inspection. Make sure you have fresh gas in the tank too and give it a good shot of gas treatment, we recommend Seafoam. Check all your vacuum hoses and make sure you don't have any leaks in the hoses. Check the plugs too.

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post #4 of 6 (permalink) Old 10-28-2010, 11:42 AM Thread Starter
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Thanks for the advice guys!
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post #5 of 6 (permalink) Old 10-29-2010, 12:58 AM
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Welcome to the Vulcan madness kidstunt3. Where are you from? (Fill out profile and it will show on every post.)

Here is link to the gallery with four albums (53 photos) of Daddydave`s carb cleaning (parts one, II, III and IV) done by Crobins. You can get a pretty good idea of what needs to be done when you start cleaning the carbs.


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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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post #6 of 6 (permalink) Old 10-29-2010, 10:23 AM
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had th exact same problem when i got my 85.....definately was the carbs....dirty jets and had to take the jets out and clean them....had to clean them again after a couple weeks because after running seafoam through it broke some more stuff loose and plugged them again. also changed plugs and battery and adjusted fuel mixture to 2.5 turns out and not a problem since
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