Polini recommends driving with a SHA 13-13 carburetor.
Ignition approx. 1.8mm.
Recommended spark plug = NGK B6HS
-Bore = 46mm
-Stroke = 43mm
-Volym = 71,46cc
The cylinder skirt's diameter of 50.6mm means that you need to grind / mill up the engine block to a depth of 34mm to be able to lower the cylinder.