My CBR600F3 will not start unless i put the throttle back about 1/4th.
If i let it idle with or without choke it stalls.
It also doesn't seem to be running right. Once it gets warms seems to do alright starting and driving.

 

Could be carbs or idle too low. How long has it done this? What's the bike's maintenance history?

 

Also when it's warmed up, what rpms is it idling at and how steady?

 

also, what oil / filter, and what temp is it outside?

 

I had the same problem until I changed the air filter to a K&N as it was likely the filter wasn't changed for a couple of years do to the bike doing 1000 miles over 4 years. May not be as simple a fix as this but worth a try.

 

I just changed the oil and filter and put in 20/50 as I live in Florida and its been in the mid 70s. I did take a look at the air filter its still off white.

 

First of all, you should be running 5w40 or 10w40 in your bike... so you might consider swapping. What brand did you use. However, I doubt that would be the problem you're having.

How does it run once warm? Rpms @ idle?

 

I would suggest some different oil, only because I used 10w-40 and 5w-40, mainly the latter-- the rotella synthetic (5w-40) at walmart was a cheap and easy alternative... runs smooth