Structural features:

• Two staged cylinders in 90° V-arrangement, with
• one-throw crankshaft, single acting trunk pistons
• 1st stage: 1 cylinder
• 2nd stage: 1 cylinder

Valves:

• Combined suction and pressure valves for both stages

Air cooling:

• By radial fan directly driven by the crankshaft

Intercooler and aftercooler:

• Finned pipes

Splash lubrication:

• Oil level inspection glass
• Crankcase venting from oil filler to air suction filter

Bearings:

• Crankshaft: cylinder roller bearings
• Connecting rod: needle roller bearings
• Wrist pin: needle roller bearings