Re: Fuel filter
Your CBR runs as close to hot as possible, but if it's cycling, maybe this is in the upper range but acceptable? Maybe a CBR owner has close temps to yours by 2 degrees?
Test and decide if you should flush your coolant.
You can find a sensor that turns on the fan earlier.
Carb bikes don't do well sitting, I have four bikes with carbs now that I routinely run each weekend (ride them to full temp for a few minutes, change oil every 3 months until my knee mends ) to keep the carbs from reacting to ethanol used in our fuels here. About once a month I replace the fuel and pour the old stuff into my truck and inspect my fuel tanks inside. It's a very hostile salt and humid air quality in FL along the coast, and I've seen plenty of havoc a lack of maintenance does to bikes everyday.
I'd also confirm the temperature with another gauge.