I’ve had a bit of an overheating issue on my 1998 Fireblade RRW. I’ve replaced the thermostat and replaced fan switch and radiator cap. All seems ok this morning, didn’t bubble over, but the temperature still seems high to me.
ON M1 it’s fine and sits at around 76º, once i turn off onto A41 with relatively bevy but flowing traffic it’s at around 92º, and when I get through to riding through soho and static traffic on regent street, it’ll get up to around 104-105º before the fan cuts in. It doesn’t go above 105º, but does this sound right?
Obviously I’m concerned about head gasket, but there’s no oil in water or vice versa.
I may just be being paranoid about the temperatures!
I have exactly the same experience - by the time I’m getting to central London and everything is grinding to a halt the temp regularly hits the kind of figures you are talking about and the fan kicks in.
It shouldn’t damage the bike so long as the temp stays at the point where the fan kicks in when it should start going down - obviously if your temp keeps going up you should switch your engine off.
Some people fit manual fan switches to bring the fan in earlier but if the manufacture reckons the bike can cope with hitting these temps before the fan cuts in I’ll take their word for it.
Guy I was talking to at the Yam shop said one of the reasons the bikes run quite hot before the fan is calibrated to cut in is emissions related (running hotter more efficient and less emissions?).