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engine: Yanmar 2GM20F (F = fresh water cooled) - US tech hotline (866) 526-9717 M-F 9am-5pm (ET); UK Yanmar help site

transmission: Kanzaki KM2P-1 viewed from behind, output (propeller) shaft rotates clockwise for Forward (Ahead) direction; gear ratio probably 2.62:1 based on this table.

prop: Martec 15" diameter x 14 pitch Right Hand turning (viewed from stern) for 1" shaft ;

Prop Walk in reverse pushes the stern to port

fuel fill: Perko probably an old model 0521. O-ring for it as well as the 0507 for waste is the Perko 0520DP099B, 1.75" OD, 1.5" ID, 1/8" dia ring