2012 Triumph Daytona 675R
Thanks for the kind wishes!Sorry to hear you've spanked yourself up. Get well soon.
Had to comment as your bike has experienced the same issues mine had.
Mine was also a 2006 model and I had the temp sensor fail and the temp gauge show a couple of bars when clearly it was very hot from riding on track. I had it happen twice. Once was the ambient temperature gauge in the airbox the other time the temp sensor on the back of the cylinder block. It also had the effect of telling the ECU the bike was running cold and so it made the mixture richer. Consequently under about 8,000rom it ran rough and was jerky on the throttle exiting corners. Not nice.
The radiator fluid boiling over may not be connected with the temp sensor though. I had this also, in fact it's a common problem on these bikes from what I've read on here, and the general consensus is that there is air in the coolant. I made a small discovery when replacing the temp sensor on the cylinder block. Whilst everything was apart I took out the thermostat and checked it worked ok by putting it in boiling water. All OK. However whist it was apart I ordered a new one to replace it, just in case. When I got the new one it was identical to the OE one (same manufacturer) except for one small detail. There is a small 2 to 3mm bleed hole. On the OE one there is a ball bearing in the hole, but the new one did not have this ball bearing, just the hole.
My theory is that this ball bearing sticks when you refill the coolant and traps some air. You do have to ask why the replacement had no ball bearing. Anyway if you are ever in that area again I'd suggest removing the ball bearing. Once I did this I never had issues with air in the coolant. I think I posted a thread about it some time ago.
After I replaced the coolant temp sensor I never had a problem. Normally once I enter the pits the temp gauge goes up to 6 bars from 5. Fan kicks on sometime after that. During the time this was happening to me, the gauge would sit at 5 until the coolant started to boil over, and it was violent, not like a little air burping out of the system. It blew the cap off my overflow tank! Anyways, once I replaced the sensor, the bike will hit 6 bars after idling and the fan will come on. I've never seen it go past 6 bars since, or spit up any coolant. If I ever need to replace the t-stat that bearing will come out though, thanks!