Look in the engine manual that comes with the plane/engine. You can find it at the link that I listed above. The "run-in" procedure that I posted is copied DIRECTLY from the manual. If you want to look at the engine manual it's listed on page 15. You can run it rich if you like, but I advise all of my students, and beginner's that we help here on RCU, to do the break in procedure. It will give the engine a better chance to get properly broken in which will reward the pilot with a long running reliable engine.

The reason they don't say anything in the manual is because they want to maintain the "quickly ready to fly" sales pitch that they have. Have you noticed that they say that these planes are ready to fly in as little as 20 minutes??? But they don't tell you that they require 16 hours to charge the batteries on the radio in the sales pitch. Same thing with the engine break-in. They don't to add that time into their "ready to fly" time. But when somebody has just laid out close to 400 bucks for a plane you would think they want to keep it in good condition. That's what doing a break-in will do for you. The first 15 minutes of an engine's life is going to dictate how that engine is going to run for the rest of it's flying life. If you immediately put it in a plane and get it in the air, even if you do run it rich, it's still has a load on it and you'll pay for it later on in the life of the engine. But if you give it an easy run for the first 15 minutes or so you'll be rewarded with a long lasting engine. Of course the choice it up to the pilot, but most that I've seen want to protect their equipment.

Ken