1EA NEW Z50A UPSIZE PISTON KIT CONVERT 5OCC TO 70CC USES STOCK 50 HEAD (100020)
47MM PISTON KIT (100020/M) BORE UP KIT FOR OLD 50'S
 
YOU MUST USE A 47MM BORE CYLINDER 63MM TALL OR STOCK CT70 XR70 CRF70 CYLINDER
 
AND A "SHORT ROD" CRANK ie Z50A 1968 TO 1981
 
AND A  HEAD FROM SAME ie Z50A 1968 TO 1981  
 
THIS IS TO BE USED WITH THE STOCK Z50A HEAD AND CRANK 1968 TO 1981
 
THIS MAKES OLD PRE 1982 Z50'S INTO 72CC'S IF YOU USE A 47MM CT70 CYLINDER OR THE LIKE.