I have a DA100 with 3 gallons through it using Lawn Boy Ashless 2 cycle oil and a Biela 27x10 prop. I plan to run 4-5 gallons through it before changing to Amsol and a Menz 28x10. However, I got to wondering how do you really know when you have completed a thorough break-in? I know I should experience increased power and RPM against a given prop, however, on all my other gas engines this occurred gradually over time and continued well after 5 gallons. I'm turning 6,500 RPM with the Biela 27x10 but would rather load the motor to about 6,100 RPM. The Menz 28x10 will probably be about right but I don't want to load the motor up too soon. Any tips on knowing when a motor is ready for synthetic oils and heavier prop loads?