1. run it a little richer
2. go down in pitch size by 2 inches until broken in
3. do you have the recommended oil% in with the gas?
4. cut an air escape hole in the rear of the cowl to allow the hot air out
5. Is the compression OK when the engine is cooled down? if not, take the muffler off and look in the exhaust port, if the piston/ring is scored and grooved where it goes up and down in the exhaust port... send it back to DA