Can't quote you the exact operating temp that your engine will heat too. I would guess timate about 260. As far as running it. Breakit in in your heated garage. about a tank full then take it out side and have fun freezing. I ran mine last week at 5 below, it was a little hard to start. but once it was running a okay! I used a heat gun on the head to warm it up so it would start easier

Tom