CBR F3 off-idle stumble

[aberrant]

How should a 1998 CBR600 F3 idle? When this bike is cold, it idles poorly and opening the throttle makes it stumble and the RPMs drop for a second before raising. Cracking it wide open from idle while cold kills the engine. When warm, the hesitation goes away, but the idle RPM is still erratic. Every second or 2 it jumps a couple hundred RPM, it sounds really erratic and you can hear it stuttering clearly. I thought the RPMs were dropping when it "stumbled" at warm idle, but after looking closely at the tach it seems more like it's getting little random blasts of throttle and then dropping back to normal idle RPM, which is around 1200. Is that normal? How do I adjust the fuel mixture?

Also wondering how to remove the top triple clamp, it's all scratched up from keychains. I'm thinking of either stripping and polishing it (it looks like alumium), or painting.

[Hex]

It sounds like the carb's could do with balancing.

Are you using the choke when the bike is cold? Basically when the engine is cold whacking the throttle open wont do it much favours.

At normal operating temperature, the idle is at about 1200 rpm. Slight fluctuation is normal, however if the carburetor balance is out this would exadurate the pulsing and lumpy/bumpy idle.

Get the carb's balanced before wanting to mess around with fulling mixture.

Hex
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[Claud 14.7 to 1]

When bike are cold, most will "pick up" badly. The bike has to be warmed up. Mine certainly needs to be warmed up. I find that my idle speed is lower when cold, as the engine warms up the idle raises to the normal position.

That should solve the cold hesitation problem.

The lumpy idle, id say is due to un-balanced carbs. Now it could be somthing else, but the carb balancing issue is most likely.

Mine also does this btw .

Mine will be sorted soon, although at the minute its not a major problem...