My tuning skills are improving.  With my dyno-prop installed, I was topping out at about 4,000 rpm.  The spark advance was on the way down, but the AFR was on the way up.  Way up.  To the point of lean cut-off.  Right before the stumble, at 3800rpm,  I was burning approximately 5.25gph.  At an idle centered around 800rpm, the burn was about 0.6gph.

These numbers sound reasonable to me.  Is this about what other builders are seeing?

I'm adding fuel across the board at the top end, and will expect a higher RPM tomorrow.  The big race now is to get home from work and find a hole between the summer storms to roll the plane out, get a logging run and roll it back in before the lightening gets it.  Last night, I got in a hurry and left both the garage door and inside door open.  The house filled with exhaust fumes to the point that all the fire alarms started going off.

The wife was *NOT* happy with me.  8*)