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It seems they aren't needed now. According to profo in post #23 the 831 is J609B compliant and the Northern Tools 4.5K is a direct bolt up. Thank you kindly for the offer though.

profo, A few pics would be awesome!

I'd be game but before we go down that road we need to verify that the engine is J609B compatible. Need someone to verify the bolt circle diameter on the 831 as well as the output shaft dimensions.

According to the TM the PMA provides 32-50 VAC to the Battery Charger. Sending 120 VAC into it would probably let the magic "white smoke" out of it.

Great info. I agree it's looking like a J609B bolt pattern. Any chance you can measure the distance from the mounting surface on the engine to the beginning of the shaft taper and also from the mounting surface on the engine to the end of the shaft? Also can you measure the bolt circle diameter...

Before we get too excited we need to verify if the 831's engine is a J609A, J609B or some other mounting pattern and shaft setup.

One easy way is with my governor controller. I can easily change the firmware to make the 831 run at the correct RPM based on the frequency output of the new gen head instead of the frequency output of the PMA. Simple firmware change.