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THIS IS TO BE USED WITH THE STOCK Z50A HEAD AND CRANK THIS MAKES OLD PRE 1982 Z50'S INTO 72CC'S IF YOU USE A 47MM CT70 CYLINDER OR THE LIKE.

@ 47MM_PISTON_KIT (OLD_50_DOME) OR (NEW_70_DOME) (SHORT_ROD) (SHORT_CYLINDER) 7/21M (100020/M) (S1406) 100020/M (S1406)