So finally got around to putting the 820 on the bench, it seems to be running fine and sounding healthy hitting the speeds I want it to, but floods when I tilt it forwards. It is already idling pretty lean, and tuning any leaner would cause it to pick up speed whenever it isn't tilted. I figured fuel was pooling and tilting it forward would slop it down into the crankcase. Impulse line is fine, carb was recently rebuilt, but it didn't have great compression, wondering if there wasn't enough vacuum to pull the mix down the throat.
I've had some replacement rings sitting around for months so figured I'd take it apart and clean things up, inspecting the boot while I'm at it (and likely punching a pepsi can to over-ride the governor, wondering if that could also be causing my issue). Good news is that the intake boot is looking perfectly fine
Piston was in pretty rough shape, and a jagged edge or 2 on the cylinder. I got things as cleaned up as much as I felt like doing tonight, started packing bits away to keep them clean and noticed the rings don't match
. The cabers I've had kicking around were 1.5mm thick, my piston has the twin .5mm thin rings. Oh well, the piston was looking like it might not ever be in perfect shape, so guess I'll place an order and see if the red barn garbage will suffice.