Franco Oliani came across this one for us which he discovered whilst looking through an old magazine. In the late 70's, Roberto Cestaro from Vicenza realized this interesting engine.

The initials F.B.M. stand for Fusari, Breda and Marconi who contributed to its realization. It was a 4 valve, DOHC which was cam belt driven which gave 56 horsepower at 9,000 rpm. It had magneto ignition with two plugs. The compression ratio was 15:1. The picture* I've sent was taken at Casaltone di Sorbolo in 1977 with Lorenzo Franchetti as a rider. 

* Missing