I am almost 100% positive the high temp light kicks on at 220 degrees F on the TRX450R. Yes, they run hot! Also, when you first start the machine, the temp light should come on and stay on for about 5 seconds, then go out. This is to show if it is working properly or not. If it does not come on at start up, there is something wrong. I had a trail tech computer on mine that would read 190 - 210 on regular riding.
RIP - Yamahondaman!! You will never be forgotten!
RIP - Sam Brehm!! Gone but NEVER forgotten!
RIP - Sandpuppi101 - You will live on in my mind - I miss you friend!