ORIGINAL: wzak29
gaRCfield "At 12,000 rpm, it doesn't take long do damage the engine "
how can breakin damage a engine I thought it runs or don't.
If the air/fuel mixture is too lean, the engine will overheat. It may or may not be damaged by this.
Icarus,
If the instructor is gone for several weeks, running the engine really will not accomplish anything since you will not be able to fly until he returns.