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OPS 60 URSUS RCA motor was obtained from Yahoo Auction as usual, at extraordinary cheap price the other day. It looked like a typically worn out junk motor, but it has no history of operation, with virgin P/C, tight and alive crank shaft bearings with no lusting internal construction, but with dusty head and cases, clogged Perry carburetor, distorted main needle valve, no other irreversible defect was observed, all of the inconvenience were corrected into original condition as a matter of fact. Also, ENYA 60-3B muffler was set in position with a slight modification safe. A bit earlier exhaust timing would allow a Tuned Pipe if I desire.

Crafts in 1970's like this URSUS motor are manufactured with some keen sense by skilfully excellent craftsmanship especially in the fitting between ABC piston and cylinder in addition to the stout and reliable construction. So, this motor would last me through my life or more over, if it would not be operated in critical condition like an airplane falling down accident or being in too lean fuel mixture.
This OPS motor deceased and thrown away and forgotten for long period of time would be put into the sky by myself very soon like a Phoenix.
I recommend this motor with Schnurle scavenging combustion system as one of the best motor in the world even if compared with any other recent 60 motors.