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idle creep, high idle when cold

  #1  
Old 05-02-2012, 09:24 AM
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Question idle creep, high idle when cold

So heres the situation, my idle was a little high at the beginning of the season, and when the bike is cold my idle is pretty high anyways (2k). My idle has started to creep about 100rpm per month since March. Strangely enough, my idle is correct when the engine is at about 100deg (1.3krpm), but once the bike gets up to 180deg the idle goes back up. This week I've also noticed she doesn't want to start up as quickly as normal. My initial thought is FPR as I can somewhat smell gas and my riding pants are starting to smell like gas, but my fuel economy is still 40-42mpg; any input would be appreciated. 2002 CBR F4i, 22k miles. I'm worried about just dropping the idle, because if I come to a stop when the bike is at 100deg I"m worried it will stal out on me.

In March was:
When cold - 2k
at 100deg. - 1.3k
when warm -1.5k
In April was:
When Cold - 2k
at 100deg - 1.4k
when warm - 1.6k
In May is:
when cold - 2k
at 100deg - unknown
when warm - 1.7k

Thanks
 
  #2  
Old 05-02-2012, 09:08 PM
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check to see if your vacuum hoses are connected like the two small ones in the back of your air box. you may also want to sync the throttle body. in the service manual, it's called sync-ing the starter valves.
 
  #3  
Old 05-02-2012, 11:53 PM
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I would start by adjusting the idle screw. I don't know about the stalling, I usually wait till my bike is about 150* before going anywhere out of habit. You could let it get hot, adjust the idle. Then shut off and let it get cold, and see if it starts and warms up alright. Then try syching the throttle body if that doesnt solve it
 
  #4  
Old 05-03-2012, 01:33 AM
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My bike slowly creeps up to around 3k when I first turn it on after not driving for a week or two. Usually goes to normal in a couple of minutes and definitely after a ride. I just ignore it lol
 
  #5  
Old 05-03-2012, 09:21 AM
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Second that, mine does that too. I am in Chicago and it gets cold and I try to ride if its not snowing and my bike revs higher than that till it warms up. Never was a problem for me.
 
  #6  
Old 05-07-2012, 06:08 PM
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Originally Posted by aurora_F4i View Post
Second that, mine does that too. I am in Chicago and it gets cold and I try to ride if its not snowing and my bike revs higher than that till it warms up. Never was a problem for me.
,
This is normal behaviour for our bikes to do. It has an "auto-choke" system built in, which runs primarily off the coolant temperature. If the coolant temp is below 35 degrees celcius ( 95 degrees farenheit) it drives the idle up somewhere around the 3k mark until it warms up. As the coolant reaches that mark, it trims the fuel out, like reducing the choke on the carburated bikes!
 
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