This kit is for 12V engines with a 6V 70th cylinderhead or the Ultrahead (22/25mm valves).
Steel cylinder: 63mm long and with 51mm bore.
For 12V crankshafts!
This kit works fine with a 20mm carb.
We recommend to use this kit with a stronger oilpump.
Honda 12V Dax ST50 / AB23 50cc / 12V Monkey
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