Our guys almost all run homebrewed fuel - 15/18 Omega is common. That is, 67 percent Methanol, 15 percent Nitro and 18 percent of the pink oil from Morgan.
Harry Baby You sure fool me. For a guy that sticks up for the OS50SX and doesn't own one and just have 2 OS 4 strokes don't make sense. Thats funny I have searched for morgans pink oil for homebrew and all they offer is BLUE and GOLD 2 stroke oil. They said the pink color is added in the factory package. I see your one of the 30% none bearing replacers at your field. The steel cage might have been the second replacement set for a 50.