How do I properly break in a new chainsaw?

Break in a chainsaw by working it through heat cycles and varying loads, not by letting it idle. Run the first tank doing light cuts like limbing and small logs, then let it cool completely before refueling. Second tank: moderate cuts. Third tank: full throttle in bursts but no sustained max RPM. Use the right oil mix (usually 50:1), don’t idle more than a minute at a time, and always warm it up for 30 seconds before cutting.