RE: 23cc Engine break-in
I have been told to run it around varying throttle through the rev range (without WOT) for 5-10 minutes, let it cool for 10 minutes and repeat the cycle 2 or 3 times. The cooling between sessions is best for the motor. Run non-synthetic through your first tank then switch to synthetic and drive it hard after that! Gassers respond well to the whip!!!
The very worst thing you can do is run it at a steady rpm while running it in, so ignore that suggestion above.