esanger,
Downunder gave you good advice. I'd point out one thing though. ABC engines have a different break in routine than non-ABC.

Is the 61FX an ABC engine? If its not, I'd run the first couple of tanks between "4 cycling" and "2 cycling" (rich and lean settings). You can tell the difference by the sound of the engine. 2 cycling (the way the engine is designed to run once broken in) sounds like a fairly high pitched whine at full throttle. 4 Cycling on the other hand, sounds like the engine is skipping. Kind of a "blubbering" sound (at full throttle).

When 4 cycling, combustion of fuel is only happening on every other stroke. The non firing cycle provides a lot of extra raw fuel and oil which keeps the engine from getting too hot and causing excessive wear to the piston, ring and sleeve.

The design of ABC engines however, require a hotter break in. So ABC engines should be broken in with a series of strictly 2 cycle runs. You want the engine to remain slightly on the hot side while running, then allow for a cooling off period every few minutes.

By the way. Turning the needle valve "in" or clockwise will lean the fuel mixture. While turning it "out" or counterclockwise will richen the mixture.

I'd also recommend having someone at the field. It's hard packing stuff up and driving yourself to the hospital with a wide, bleeding gash across a finger or your hand. (Ask me how I know this.)
Dennis-