Micro CoGen.

I measure frequency with a Kill-A-Watt meter. The test were with the generator switched to 120V only, vs the 120/240v. Since i didn't have any spare 240v twist lock plugs, it was easier than tapping into my patch cord. 
I agree the loaded value didn't look bad, but i wasn't sure if running unloaded at 129v and applying a light load would be a good idea, and the swinging Hz value was unsettling.  This only showed up after the generator had run a few minutes.  Any thought on a final uf rating? 

Well i ran some tests at results by changing the AVR  capacitor and it made a much larger difference that i thought.
The hz under no load were all over from 62 to 80 hz, so i guess doubling the stock capacitor was too much.
as follows
16uf no load 120v 62.5 hz
32 uf no load 135v 64hz initial with fresh capacitor
adjusted speed down

32 uf no load 129v 62 to 80hz
the slightest resistive load dropped the Hz back to a steady 62
32 uf 12 amp 125v 60 hz
32 uf 18 amp 123v 59.5 hz
as much as i hate trial and error for a $50  half moon capacitor. I guess i will settle for a  22 to 24uf AVR cap.

I will test it under load again to get some firm numbers, but as I recall the voltage dropped off enough to affect lights, blower fan.... It doesn't appear to have any adjustment other than throttle.  I replaced the capacitor with the same 16uf 450v unit and the voltage and Hz dropped just as bad.  I don't understand capacitive regulation, but have noticed that other similar sized units appear to have larger capacitors in them.  I am toying with the idea of putting a 24uf unit it to see if my voltage will improve relative to frequency.

Hello,
I have a chinese yanmar knock off 5KW 120/240v diesel generator and it runs fine, other than being very load, but my no load voltage is 116 at 62.5 Hz.  When i raise the speed, the voltage and frequency both up, how do i get the voltage up and still keep the frequency below 63?  I changed the capacitor in the head but that didnt change the readings.
Help!
Jake