RE: u-can-do 60
Cheer up!
The OS 91FX is a great ringed piston engine, not one of OS's peeling plated cylinder wall engines. I have three and they all start easily and consistently run fine.
I have two UCD 60's powered by OS 91FX's and the other one is in a Hobbico Extra 300 AWARF.
Who knows, maybe I got the only three good ones. What is the likelihood of that?