This kit is for engines with a 12V 70cc cylinderhead - Type 126 (20/23mm valves).
Steel cylinder: 63mm long and with 51mm bore.
For crankshafts with 41,3mm stroke.
This kit works fine with a 20mm carb.
We recommend to use this kit with a stronger oilpump.
This kit is marked with 49cc
Honda 12V Dax ST70 / AB23 70cc