I have a temp gun. I'm 99% sure that it's operator error. I'm still learning my transmitter and I am still trying to get the whole lean/rich thing down. When it initially started I had just brought it out from my house to the garage. After quickly flooding it, pulling the glow plug, draining it...it started right up. It left the chilly atmosphere of my garage and headed toward the end of the driveway in about a 40+ degree temp. As soon as It returned to the garage it shut down. I couldn't get it started again. so...next time I'll try to preheat the head with a blow dryer or something, but in colder weather do you run lean or rich. lean means more air and rich means more fuel... is this right? Seems like I would want to pump in more fuel than cold air. Am I on the right track? Today it's going to get up to about 50 degrees.