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Guia da válvula admissão R50, R50/2, R60, R60/2 cunha curta (6mm)+ 2 ranhuras.
Guia da válvula escape R50S cunha curta (6mm).
1 Cilindro » R25, R26, R27 (50 - 66):
R 27 (0T15) (08/1960 - 08/1966).
Boxer » R 50, R51, R60, R67, R68, R69 (50 - 69):
R50
R50/2
R50S
R60
R60/2.
1 Cilindro » R25, R26, R27 (50 - 66):
R 27 (0T15) (08/1960 - 08/1966).
Boxer » R 50, R51, R60, R67, R68, R69 (50 - 69):
R50
R50/2
R50S
R60
R60/2.