ORIGINAL: Trisquire
Jett recommends a bench break-in. They suggest simulating airborne RPMs by using a prop one inch smaller than normal. 30 minutes of rich running on the bench with the smaller prop, then mount the engine on the plane, switch to the right sized prop and go fly.
Tom
Stick a thermocouple under the glow plug with some onboard readouts and see what you get on the ground and in the air.