all this tuning talk triggered my interest. I have done porting to many of my buggy engines, but never an aeroengine. well I just did the outside sleeve porting on my asp xls 52. I camfered all around the lower part of the sleeve and camfered and added guide channels to the intake ports on each side of the exhaustport. the intakeport right across the exhaustport was camfered from the factory, so I left that one alone. While I was at it I also removed one of the two headshims to raise compression because I will try to run some faI fuel.It all took just half an hour. I will run my engine by the weekend and compare tachreadings to my previous results. I`m very exited about this and will be very happy if I gain 2-400 rpm.If not successful I will put back in the headshim and run my regular 15/15 fuel and compare again.