Malossi recommends driving with a SHA 13-13 carburetor.
Ignition approx. 19° before TDC (opening gap 0,45mm)
Recommended spark plug = IRIDIUM IW F 27 , NGK B9HS / B8HS / BR9HS / BR8HS
-Bore = 47mm
-Stroke = 43mm
-Volym = 74,6cc
The cylinder skirt's diameter of 50.2mm (-+ 0,1mm ) means that you need to grind / mill up the engine block to a depth of 29mm to be able to lower the cylinder.