Thanks for the reply on the possibility of vibration causing a motor to run hot.
Today I replaced and tightened the mounting bolts on the OS .46 LA and went out to the field to try it out.
It started right up and appeared to be running OK on the starting stand. I then noticed that fuel was coming out of the head and bubbling as the motor was running. AHA!! could this be the culprit?
I then tightened the headbolts and restarted the motor. Let it run at full throttle for 3 minutes on the stand. Ran steady and did not slow down or get hot.
I then put the airplane in the air and flew the entire tank out. Didn't mis a beat even in loops and rolls. After that I put a student on the buddy box and we completedl three more flights without a hitch.
Now what I wonder was the lean hot run caused by the vibration caused by the loose mounting bolts or was it the loose head bolts? Or a combination of both?
Just glad to have it operating again. Thanks for your information.