Odd idle... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 3 (permalink) Old 05-29-2007, 08:12 PM Thread Starter
 
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Odd idle...

I'm not sure what the deal is, but I'm having trouble with the idle on my bike. It seems to idle slow (about 1000 rpm) when the bike is cold, but then idles higher (2000 rpm or more) when the bike warms up. So, I adjust it back down, but when the bike is cold, it won't keep running and I have to adjust it back up until the bike warms up. Any ideas?

The problem seems to come and go sometimes. Today, it was fine when I rode but over the weekend it kept doing this up and down thing. Any ideas?
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post #2 of 3 (permalink) Old 05-29-2007, 09:06 PM
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I'm gonna second CManning's post in your other thread, about synchronizing the carbs. THe variable idle is kinda indicative of carbs being out of sync (come to think of it, ignore my pm about fuel level adjustment for the moment - carb syncing is easier and probably the source of some of the troubles).

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post #3 of 3 (permalink) Old 05-30-2007, 12:37 AM
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Something else that I've seen is the pilot jets being varnished up causing similar problems. I'm sure you have dosed the gas with seafoam by now, but if not, it's a good idea.
The fuel mixture needs change as the engine heats up, which is why you choke a cold engine. It needs more fuel when cold to run, and less fuel and more air when it warms up. Rising idle generally points to vacuum leaks as well. Vacuum leaks cause more air to get into the combustion chamber, causing a lean condition. Lean conditions usually result in faster idle when the engine is hot. Not necessarily noticable when the engine is cold, especially since you probably have applied choke, closing off some of the air getting in. Just some more things to check! Good luck!

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