Change 10-14-18-21 Gran Turismo

Quadruple specific for all tuned touring engines with long primaries, strictly recommended in the 225cc versions. Z12-13-17-20 (Fourth Short). Applications: Vespa ETS 125, Vespa ET3 125, Vespa PK 125, Vespa PK 50, Vespa PK HP 50, Vespa PK XL 125, Vespa PK XL 50, Vespa Special 50 4M, Vespa PK HP 50 V, Vespa Primavera 125, Vespa 90 , Vespa 90 SS, Vespa Nuova 125, Ape 50, Ape 50 Transformation 125.