I don't mean to be a trouble-maker or demand the impossible or anything like that, but since I just fried a piston in my Solo 690 milling chainsaw this question has been bugging me. Why don't chainsaw manufacturers put in a Heat Alert System into their products? As I understand it, over-heating is a main cause of chainsaw failure, either from an incorrect (lean) carb setting or from an over-lean condition due to unexpected and neferious air leaks. It would seem to me that a heat sensor placed in a stratigic location within the cylinder (or better yet in the piston), arranged so that a red LED light turns on when operating temperatures reach danger levels would be a very useful chainsaw feature. An auto shutdown device would be even better, but more complex and costly. A simple and obvious red LED would work just as well. Maybe it would blink at you wildly, the message being: "Hey moron, if you don't shut me off PDQ I'm going to melt down or seize up on you! Okay, you asked for it!" Obviously, there must be some kind of insurmountable technological hurdle that makes such a simple and obviously useful feature such as a Heat Alert System totally impossible. Otherwise you'd think every chainsaw built would have such a critically useful feature. After all, these little 2-stroke engines are running wide open at 12,000-13,000 rpm and aren't lubricated very well to begin with. As far as I know none have a Heat Alert System, at least mine don't. Why not? Thank you for listening and I'd appreciate hearing your comments. Some of you guys know a lot more than I do.