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Unusually High Idle RPM

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Old 09-16-2010, 05:33 AM
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Unusually High Idle RPM

Last night I went for a ride and my bike started up fine and was running normal except I noticed the idle was around 1500-1600 RPMs. I believe that is the normal idle range but my bike was idling from 1000 to 1100 on Tuesday. I tried pulling the choke to see if it had gotten caught and it didn't do anything and I am not sure what it could be. Bare in mind I am not a carburetor guy so I am still learning, and when I did a search I didn't see that many relevant topics.

For a little background information, I was using my bike to commute about 50 miles, both ways, a day since August 16th until yesterday when my truck was fixed.

Thanks in advance,

-BA
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Old 09-16-2010, 05:56 AM
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well reach under the tank from the right side and turn the plastic handled idle screw counterclockwise and get your idling back to 1000.
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Old 09-16-2010, 06:00 AM
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Usually a high isle like that is the result of an airleak somewhere... Check all vacuum lines...
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Old 09-16-2010, 06:04 AM
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Will do, what normally causes the idle screw to move/an airleak to occur? I am just curious because the other day it was running just fine. Could my bike is jealous of my truck?
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Old 09-16-2010, 06:08 AM
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Nothing causes the screw to spontaneously move... Airleaks are mostly caused by dried out old hoses...
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Old 09-16-2010, 06:09 AM
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Originally Posted by amhsraptor
Will do, what normally causes the idle screw to move/an airleak to occur? I am just curious because the other day it was running just fine. Could my bike is jealous of my truck?

i think you may have hit on something here.
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Old 09-16-2010, 07:55 PM
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Could also be sticky, kinked, or misadjusted throttle cables. be sure they have the proper slack when turning the bars lock to lock.
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Old 09-16-2010, 08:21 PM
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As it just happened overnight I would also have to believe it was a hose that split and caused a vacuum leak.
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Old 09-16-2010, 08:24 PM
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Or a carb fart blew it off.
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Old 09-17-2010, 04:19 AM
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air leak, failed hose IS most likely.
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Old 09-17-2010, 06:25 AM
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choke has no effect when pulled, i'd start by looking there.
maybe the tension adjustment... ?


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