Norvel .074
After reading further, feel the need to add more comment on the Norvel Revlites. I won't question anyone's success in getting their Revlites to run but soaking in oil is not the real solution. Neither is running in the engine when cold using an electric motor. The idea is that the cylinder expands when up to running temperature and gives a just right fit and compression seal. If you force it over cold, when new, you will be prematurely wearing out the fit. Plus, the extra stress on the rod will either break it, bend it, or wear out the bore on both ends. To break in any engine properly you have got to get it up to running temperature for brief runs with thorough cooling in between. Don't let the heat gun treatment think that this is contradictory. The heat gun doesn't get the engine as hot as when at running temperature. It simply makes the engine easier to turn over to get it started. Thereafter, running at operating temperature gets the break-in process going.
As in any ABC type of set up with a tight piston fit, you do not want to run the engine rich when new EVER. It won't come up to operating temperature and will wear out,,, not in. Dial it in to a just lean two cycle for the first three or so five minute runs. Then for the next three or more runs you can lean it out just a bit at a time.
Again, the reason for some of the difficulty by some modelers is that this is a unique system. Similar to ABC design philosophy but also very different. The Revlite cylinders are hard anodized. This means that they are so hard, only diamonds are harder, just about. That's why the pistons are nickel plated. Engines need a soft hard combination. Norvel has done this one (or two better) with a hard, extremely hard combination. The extreme fit at the top is there because the hard nickle is meant to wear into the cylinder for a fit that no other system can match. The Norvel engineers come from Russia's space program so they know what they are doing. They just need to improve on their instructions. And maybe make a fatter rod.
Also, the porous nature of the anodized cylinder does contribute to better power and even to better mileage. The pores of the anodized cylinder retain oil but have plenty of factory oil and the oil treatment isn't strictly necessary.