Sweet ride...

Can someone tell me what he's fiddling with on the dash at 1:07?

Dude turns a knob clockwise and it seems to lose lope and lean out....then flips a lever at 2:19 which returns to lope.

Goes through motions again but quicker as if things are now set.

This has me puzzled. Timing, electronics, actual lean/rich control???

Whatever it may be, he sure has that tub tuned nice 'n tight.