Fan Not Kicking In At 90°

2002 Speed Triple 955...

Fan would happily come on at 83°...but until about 2 weeks ago it doesn't seem to kick in.

I noticed temp was reading 90° when I got home today, usually fan would be on, but not this time - or any time recently.

Just looking for diagnostics, things to check, necessary values etc etc...

 

Some of that makes perfect sense, thank you! Sometimes it needs a calm and outside view to offer a sensible starting point! Thank you!

 

Thanks @littleade . The fan always used to come on at 83°...but since it first didn't come.on I've noticed it still not being on at 85...87...and over 90...

I have a feeling that, during my long and arduous mother post about my droplink service and when I was about to take the radiator off (to remove the exhaust header etc etc) I have probably simply knocked something, or not reconnected something down there...I'll have a good root around over the weekend...