[IanDoohan]

Hi Bo, welcome to Fireblades.org

How long has this been a problem? Is it a new problem? How long have you owned the bike?

The idle adjuster should have a spring in between it and the throttle stop on the carbs. It keeps it from loosening. That could be your problem.

You shouldn't have to warm the bike up for 15 minutes. 2-3 minutes MAX on choke, then off choke and it should stay at idle 900-1100 rpm, or whatever your manual says.

If it's not the idle adjuster, I would venture a guess your carbs are messed up on the idle/slow circuit, and they'll need a cleaning.

 

[IanDoohan]

Yeah that spring sounds like a great step in the right direction. I have only had the bike for 4 months, It was a friends bike and he mentioned that he had a hard time starting it once (he joking stated he had the fuel shut off....) and turned the adjust too far, he said that it came all the way unscrewed. He said for me to be careful not to do it, so I need to definitely look for that spring. Guess I will be pulling the tank and air box this week! thanks for some solid great advice! I will keep updating as I progress through.

Well now, seems more and more like the spring is missing. It's possible that it's bouncing around somewhere on top of the transmission or near the starter. If the cable came out, it most likely fell off.

Keep posting!

 

[IanDoohan]

Oh here is a pic of my new toy! Just would like to share, as I am planing on becoming a member when pay day hits. Still lots of things to do to the bike!
1991 Honda CBR 600 F2 Idle adjustment knob spring missing. - Album on Imgur

Looks like you found your problem :thumb:

And joining as a supporting member would be a great idea. We're an elite group :rotfl: