[quote][/quI broke the engine in on a test stand with the above fuel and no added oil, not overly rich as to 4 cycle but as rich as I could with out 4 cycling. I did this by intermittantly running at 1/2 throttle, full throttle, idle. Shut off, cool ote] Vern I see a problem with this breakin. Should be just rich of peak (couple clicks) run up hot, shut off ,cool ,run up hot (2 minutes max) shut down , cool for a few tanks. no idle and mid range runs.