I just did an inspection on mine while waiting on ignition parts and everything looks good and the piston had a nice film of oil.I run 87 octane 40 to1 two stroke oil. If it lubes my high reving weed eater it should be good enough. I also run the the timing retarded a few degrees. While this reduces power it make starting easier. Running one spring I run a tank of fuel without stopping and the head temp only reaches about 105 f. My thoughts on running camp fuel at 55 octane and any advanced timing could cause detonation and possible damage. I see where some add wd40 which will burn and possibly not leave residua! lube for the coasting strokes. I also stand the engine on its end and apply some 30 W oil to the of the piston for the wrist pin. For what its worth I may be wrong but I'm not far from it.
Hi Stroke973, It does not seem to detonate on Coleman fuel with mystery oil or 2 cycle oil added. I also manually oil the skirt end of the piston. I usually use a high grade synthetic clock oil or Mobil 1 0W-20. Both flow easily and hold a film for a long time. I agree regarding WD-40. It is not a good lubricant other than on a very temporary basis.
I avoid regular gasoline in part because it has ethanaol and because it contains a lengthy list of poisons designed to be more completely combusted and then pushed through a catalytic converter at 1400-1800 degrees which can't happen in an engine like this.
Right now I am running it on 100 octane low lead aircraft fuel mixed 10-1 with Marvel mystery oil. It is firing 24 to 28 times a minute, spinning 32-34 revolutions between firing and the highest temperature anywhere on the engine 90-92 degrees after an hour of running. The head at the base of the spark plug is just 85 degrees. The plug is not fouling with my clearly too oily mixture. At these low temps, the oil is pushed out through the exhaust while keeping the upper cylinder very well lubricated. As expected, it makes a little more grunt with the lower octane white gas camp fuel and without detonation at these low temps. I also have some 94 octane pure gasoline (unleaded) that is sold for yard machines and is available straight up or pre-mixed at 50/1 for 2 cycle engines.
Gil