OS FP 46. Years and years of flying and I've always had trouble with engines. Build and fly I can do but I must have a mental block on tuning engines. My question is, can a engine of this type be actually damaged by running too lean? Not months and month but in 1 day of maybe an hour of actual run time. I've got it at about 1 3/8 from closed now and it doesn't seem quite lean enough.

thanks,
Mike