Engine idles fast after running - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 21 (permalink) Old 04-26-2008, 11:12 PM Thread Starter
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Engine idles fast after running

The bike startes up and idles real good. If I just take a real short trip 1-3 miles, it idles normal when I come to a stop. But, if I take a longer ride and go faster, when I stop the at a light it has a fast idle for awhile. After some time it will go back to idling low again. I am guess that one of the cyclinders is filling up with fuel when I am going. The bike does run good when I ride it on the road. It does not backfire, also. How do I get ride of this fast idle after it hass been driven for awhile?
I tried last year to sinc the carbs by the yardstick method. Got them close at low idle.
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post #2 of 21 (permalink) Old 04-26-2008, 11:57 PM
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I'm no mechanical guru but your bike probably isn't warmed up completely in 1-3 miles. After the engine has warmed up thoroughly try adjusting the idle speed to 1050-1150 rpm by turning the idle adjustment screw.
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post #3 of 21 (permalink) Old 04-27-2008, 08:12 AM Thread Starter
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The idle is set correct. After it has run the long distance and sets for 5-10 min it will idle back to the same idle as when cold.
I think that it is loading up with fuel. Not sure what to adjust.
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post #4 of 21 (permalink) Old 04-27-2008, 11:37 AM
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Is it possible your throttle cable could be sticking just a tad open?
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post #5 of 21 (permalink) Old 04-27-2008, 12:14 PM
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Also make sure all the "boots" holding the carbs are on tight. A loose one can let in air and up your idle.

Mine did this when I first got it, I adjusted the air screw...which helped, but then I found that one of the clamps around the carb was not tight...and after checking and tightening them all, and re-adjusting the idle speed...no problem ever again.

KM
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post #6 of 21 (permalink) Old 04-27-2008, 04:12 PM Thread Starter
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Checked the boots and clamps, they seem to be tight. Could not move the clamps any, so I guess that they are tight. Have tried pushing the cable stop closed when it has been fast idling and it doesn't help any.
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post #7 of 21 (permalink) Old 04-27-2008, 05:05 PM
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Quote:
Originally Posted by tprender View Post
Checked the boots and clamps, they seem to be tight. Could not move the clamps any, so I guess that they are tight. Have tried pushing the cable stop closed when it has been fast idling and it doesn't help any.
So you are saying you did not actualy stick a screwdriver into them and try and tighten them, you just felt to see if they moved???


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post #8 of 21 (permalink) Old 04-27-2008, 08:16 PM Thread Starter
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Could not get to the heads without taking the gastank off. Put a screwdriver to the backside and pushed. there was no give or play of any kind. Also, took Carb cleaner and sprayed on them with the bike running and there was no change in idle. If they were suctioning air, they chould have changed idle when I sprayed them.
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post #9 of 21 (permalink) Old 04-28-2008, 05:08 PM
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Not sure what else to tell you other than:

Seafoam.

You might not have a stuck cable, but could have a sticky diaphram, so cleaning the carbs would be my next step, after setting the "airscrew" on each carb a bit more out.

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post #10 of 21 (permalink) Old 04-28-2008, 05:12 PM
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Dont forget, Engine speed is controlled by AIR going in the engine. You are getting too much air in the engine for whatever reason. Keep this in mind while hunting.

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