125cc Lifan engine charging problem

[markcrim]

Hi, all. New to the site.

I've put a Lifan 125cc engine (model 1P54FMI) in an old Honda bike (C100), and am having trouble with the charging/lighting system. In short, it doesn't provide enough electricity to run the lights and charge the battery, so the battery drains.

I've replaced the rectifier/regulator, and with the new one installed (yellow and white wires from stator on the lower-left and upper-right terminals, ground on the lower right, and the upper-left terminal is the DC output), at idle I get less than 4VDC on the output terminal even with nothing but the multimeter connected to that terminal. It's not much better if I rev the engine. And I measure between 5.5 and 7.3 VAC at the (yellow and white) stator wires coming into the rectifier/regulator.

Does this sound like a bad charging/lighting stator coil?

Thanks for any advice---I'd really like to get this thing on the street!

Mark