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1 Cilindro » R25, R26, R27 (50 - 66):
R 26 (0T14) (08/1955 - 08/1960)
R 27 (0T15) (08/1960 - 08/1966).
Boxer » R 50, R51, R60, R67, R68, R69 (50 - 69):
R50
R50/2
R50S
R60
R60/2
R69
R69S.
1 Cilindro » R25, R26, R27 (50 - 66):
R 26 (0T14) (08/1955 - 08/1960)
R 27 (0T15) (08/1960 - 08/1966).
Boxer » R 50, R51, R60, R67, R68, R69 (50 - 69):
R50
R50/2
R50S
R60
R60/2
R69
R69S.