3-cylinder and V4 2-stroke models
- 50 hp
- 55 hp
- 60 hp
- 65 hp
- 75 hp
- 80 hp
- 85 hp
- 90 hp
- 100 hp
- 115 hp
- 125 hp
Production/model years: 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972.
- 50 hp: RD-18, RD-19, RD-20, RD-21, RD-22, RD-23, RD-24, RD-25, RD-26
- 55 hp: RD-16, RD-17, RD-18, RD-19, RD-20, RD-21, RD-22, RD-23, RD-24, RD-25, RD-26
- 60 hp: RD-15, RD-16, RD-17, RD-18, RD-19, RD-20, RD-21, RD-22, RD-23, RD-24, RD-25, RD-26
Serial numbers:
- 50 hp: 283662 - 314753, 315829 - 348058, 348059 and up
- 55 hp: 288624 - 305646, 305647 - 329380, 329381 and up
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