Tuning Kit 72cc for 6V 50th Head

This kit is for engines with a 6V 50cc cylinderhead (20/23mm valves).
Steel cylinder: 63mm long and with 47mm bore.
For crankshafts with 41,3mm stroke.

Police version marked with 49cc.

This kit works fine with a 18mm or 20mm carb.

Honda 6V ST50 Z50  + Jincheng Dax Monkey