Have noticed today that only my RH fan is switching on, temp goes up to 110' when a idle, and can only drop it to 104 ish - and given it was only 7' today don't think it will survive the summer.
I know a volt metre will help identify if power is being sent to fan, but can somebody confirm that either one, or BOTH should switch on / cut in at 104 please, or does the LH one switch on at say 110+
Thanks in advance
Everyone has commented correctly about the fan schedule, coolant, oil, and temp difference. I own a 08 CBR10RR. In the beginning of ownning this bike; I was in the middle of summer in the US. I noticed the fans working seperately and saw high temps. I am on the farenhight scale so wont give related temps. Not necessary, you already know something is up with yours.
My particular case was related to battery power and a solenoid relay associated with the secondary fan. The connections were loose for the relay, and the battery was weak. Bike was under warranty so things were done with minimal cost to me. Tightened relay connections and replaced the battery, and I keep it charged with a battery tender when not ridding.
This is not what I would like to tell anybody, but here goes: Do not overlook the water pump. It may be that it is not pumping good enough, like on its last leg of life and pumping but very weak. Your temp reading that you have posted appears to be a weak circulation. This may also be thermostat related. I have been away from my bike for about a year and dont have my shop manual to refer to right now. I am giving this information from memory and experience.
What I mean by weak circulation is this; pump pressure is either restricted by clogging, or bad pump. Clogging can be due to a bad thermostat and not openning all the way.
I say this because the temps you give and how they dont seem to go down to the level they should be when the fans come on, is possibly a circulation problem. cooling system working more like a convection process, water escaping the hot engine to the less hot radiator with out pump pressure. Thus, temps not exactly what they should be.
These are questions for you. They are only suggestion and I dont need the answer;
When the bike shuts down does the coolant come out onto the ground, boiling over? Do you have good coolant? Is the coolant level at the right level to start with?
I went through this myself for my own bike. My problem wasn't exactly as you describe for yours. I have only made suggestion for you. I hope this helps a little and hope you get it worked out