New sealing ring 4,6x2,3 for the mainshaft in the gearbox suitably with Jawa model 353, 354, 559, 360, 590, 592, 362 California, 633 Bizon, 553, 554, 634, 638, 639, 640 and Jawa Perák with 250 and 350 cubic centimetres. Moreover, suitably with CZ of the models 450, 453, 455, 473, 470, 475, 501, 502, 505. This ring sits in the graft for mainshaft.
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