PAW 249 1st runs

This is a PAW 2.49 (.15 cu.in.) single ball race engine. I received the engine from a fellow modeler. It was NIB. The box was one of the older styles so I can't determine the vintage. Someone on the PAW engine Facebook page said it could be from the 1990s. It included both the C/L venturi and a throttle assembly. The first runs are with an APC 9x4 prop. The fuel mix is Eric Cluttons recommended blend of 40% John Deere starting fluid, 25% castor, 35% kerosene, with 4% added cetane booster.
Most of the runs were rich and under compressed as the engine is new. I did speed it up a few times, then backed it off.