Thanks, all - that"s exactly what I was looking for. (Especially the numbered steps, ARK, since that"s how my brain works best.)
The tractor runs fine, and I don"t have any reason to suspect that I have a major problem. (Tiny coolant leak at the head gasket, and a few bubbles in the radiator, as discussed in another thread.) I guess I"m just curious.
One (probably dumb) question: why do you open the throttle all the way?