Hello to all of you!
I want your help - opinions in the following matter :
I have a nice XT660R (05) bougth used 2nd hand.
The problem is that mostly during cold conditions (18C and below) i cannot fire up the engine without turning also the throttle a little bit.
I have checked everything, the TPS is ok, the CO is at 8, all the services are at their time (new oil and air filters,oil 15w50, valves ok).
What else should I check?
Does anybody have any idea?

Hi,
I would check the idle. 1400-1500 rpm on warm engine.

Thank you for your answer.
The idle is ok, 1480 with warm engine.
While searching i found about the fast idle valve, but i have not found something more specific in the service manual.
Any opinion on that?

I don't know about fast idle valve. Have you checked your battery under load?

Maybe worth doing a compression test?