i just purchased an 04 CBR 600 F4i. starts and idles great when its cold,however as the temperature rises the bike idles down less and less until finally at normal operating temperature it idles itself so low it can't stay running. when riding the motorcycle while its warm you have to keep the throttle opened up to about 3,000 rpm any less then that it will quit. I thought maybe an o2 sensor but this motorcycle doesn't seem to have one. Can anyone help me?
Any help is greatly appreciated!

 

Try adjusting the idle these bikes have automatic chokes so when the warm up the idle drops down. When my bike is warm it idles at 1,000 rpms when its cold its at about 2,000.

 

ya it sounds like the idle was adjusted down when it was cold.

 

I'll try that tomorrow night. i hope its that simple. if adjusting the idle doesn't seem to fix the problem is there any other things that could possible be causing the problem. i appreciate everyone's help!

 

normal idle speed is about 1,300 RPM with a tolerance of + or - 100 RPM. what do you mean it just quits? Are you saying the bike just shuts off?

 

Yes, after the motorcycle normal operating temperature it begins to idle down until the point to where its idling so low it cannot continue to run and shuts off. it doesn't just randomly shut off. if it gets below 3,000 to 2500 rpm's at normal temp. its almost as if someone turns the key off. if im driving it i have to keep the throttle open constantly at red lights or any stop sign or it will quit.

 

If adjusting the idle doesn't work i'd suggest the fuel pressure regulator.. my bike did the same thing and after i adjusted it to idle it just ran like crap at low rpm's.

 

The pressure regulator on my motorcycle looks rusty. the bike sat in repossesion for about a year(outside) so im hoping the lack of use and the fact that it sat outside in the elements for so long has caused the regulator of the pump itself to stick.the bike only has 1900 miles on it which tells you its barely been on th road. Does this seem like a plausible scenario? Again the help is great appreciated!

 

Adjusting the throttle worked perfectly. The bike runs perfectly now. I appreciate everyone's help!

 

my bike sat in repo for a cpl months also but i had to replace my fpr.. glad you solved your problem. tear it up!