Thanks everybody for the help!

A little more background may be in order. This engine was installed sideways in a Dynaflite Butterfly. I thought it would be safe to use the Sullivan Hornet starter which was made for 1/2A engines. This starter spun the engine quickly, but has very little torque. I only used the starter due to my being nervous about being alone at a field known to have brown bears in the area, wanted to get it running quickly! When I had it apart, I was very careful to torque the screws carefully in stages to avoid any unevenness.