Just started my Nexstar OS 46 today for initial break in. Followed the manual. I secured the tail with a piece of rope to a fixed object then cranked it up. Manual said to let it run for one minute at full throttle and the every ten seconds turn the adjusting screw within the range of motion from rich to lean for a full tank. Worked better than expected as I have broken in many nitro engines on my ground vehicles but this was much easier. Now I need to go to the next section of the manual to make sure it does not stall out upon applying full throttle etc...