I have run a full gallon of fuel on this engine and so far i can't get any higher than 6300 rpm on a Master Airscrew 20x10, so far I'm very disappointed with the performance of this engine, the other guys say that they can get up to 7400 rpm on similar size props.
Does it have to do with the running in period? does it need to be longer or does it have to do with the prop brand?
Any help is welcomed