Charging, the manual says...
Lights off...
at 3000rpm 1.3 + - 0.5 amps
at 8000 rpm 1.6 + - 0.5 amps
Lights on
at 3000 rpm 0.4 + - 0.3 amps
at 8000 rpm 1.8 + - 0.5 amps
Charge coil resistance 0.30 Ohm + - 10%
Carbs overflowing is quite a common problem, it may be a worn float needle, examine it for a wear ring around the taper of the valve, float height is 21mm from the gasket flange (below the gasket)