To tell you the truth I dont worry too much about temp as long as it is running properly and blowing smoke. I dont like to run my engines any cooler than 200 degrees because I feel it can cause wear more rapidly to the piston/sleeve. Normally I am real happy if it is 240-260 but that is just in general. I have one engine that runs best at 290 which some people would kringe at but it runs fine and blows plenty of smoke so I leave it.