Congrats on the purchase mate. Hope you dont find the drop in power too frustrating ...... just get it on the right roads and there aint a lot that will stay with it .....even at non licence losing speeds !!
Operating temp, dont know. I will say that my fan has never switched on (i tested it still worked !) but it does seem to send a lot of heat wafting up the inside of my thighs during summer traffic queus.
Mods, read all about them in here
Personally I felt front forks and brake were priority for the biggest performance gain as they are a bit sheeeite as standard (forks are actually OK just needed a bit of professional re-work / set up). Loads of stuff you can do to the motor depending on how deep your pockets are.
You will no doubt come accross Bill J's (clearly a skilled and knowledgeable engineer) and Wonkmeisters (look up Slipstream Tuning) posts with regard to engine mods ....different approach's for the first stage of tuning but you pays your money you take your choice.
Welcome to the forum.
Cheers
Garf