If he got the Lost 8ight 2.0 RTR he is probably using the guage on the Spektrum DX3S radio it comes with. I've found that this telemetry system is not so acurate. It shows temperatures 10deg higher than they actually are since the wire rests directly on the cooling head and not near the case. Anyway, what I said still is true. You do not want to lean the engine out to create heat for break in. You want lube and that comes from fuel. You need slightly rich settings while using a heat gun to keep heat in the engine before and if necessary during the break in.

One thing I did not mention is using some aluminum foil. Wrap the cooling head in aluminum foil to insulate the cooling head and keep temps in the engine and not to let it air cool so much.