We strongly suggest to use following method:

• Mount the engine onto a test stand with cylinder(s) being in free air to make sure that the air can flow propely over the cylinder(s). This is extremely important for good cooling.
• As per our instructions use mineral based 2-stroke oil, mixture ratio 1:30
• Start the engine, set RPM to 2000 - 2500 and let the engine run for 2 - 3 hours.
• We suggest not to use mufflers or use a old muffler due to the rich mixture.
• When breaking in period has been finished, mount the engine onto the motor-mount in your model airplnae.
• Use fully synthetic oil mixture 1:50