I check oil temp, not saying this is the best place, stock raptor has 265 after an hour of racing and a built 125 has 339. checked 2 different race quads with many mods and both were within 10 degrees.
Holy [email protected]!!! 265 - 339 degrees?! That is hot. Are you adding 2TooCool or anything to the oil to drop the temps? When you say you are checking the oil temp, are you just using a plain ole' thermometer and dipping it in the oil or are you using some fancy digital thermometer?
I remember my Raptor 250 getting extremely hot, and it had an oil cooler. It's completely normal.. My recommendation for anybody with an air cooled machine is to run them a little more on the rich side so they won't burn so hot inside the combustion chamber...
I'm looking to incorporate a 250 oil cooler onto a 125. I think this will help with oil temp. This requires engine dissassemble though... There are other things you can do to keep cylinder temp down as well.