It appears to have the same 6mm crank pin that the OPS 80 needle rod engine used. I never saw that pin break in the 80, but I question weather it would hold up under the force of that BIG piston if the engine made any REAL power.
Supposedly Jerry De Young, of south Florida, is in the process of becoming the new U.S. distributor of OPS engines. In addition he will be working with the factory in Italy (now owned by Mantua Model UK L.t.d.) to upgrade their current line of marine engines: