Hi, I checked the engine block and it is a G400. I can't find the serial number however.
I looked up G400 ignition coils and they sell sets of ignition coil, condenser, and breaker points. But none of the HT3810 parts sources that I have looked at mention a condenser or breaker points for the HT3810. It doesn't give me a warm and fuzzy that I have located the right part.
Tom