I'm with you...Wonder how he checked the timing...20 would seem to be high for starting, and 36 a little high for running......28 degrees seems to be the best timing for any engine, except for a 289 Herbrandson twin in one of our race planes..We got the same results from 22 degrees, so that's where it stayed...Most of these engines were originally designed to be used all day long in the woods cutting trees down and any old gas and oil could be used...One of my customers is a logger, using Husky saws..They go for 2 or 3 years without any problems other than dirty air cleaners and spark plugs..Airplane engines are pampered by contrast