If on throttle up the engine hesitates, puffs a cloud of smoke, then spools up, you're rich. If it hesistates on throttle up, with no big cloud of smoke, you're probably lean.

On the second engine, if it begins to speed up at idle then dies, it's lean. If it just slows down then coughs and dies, it is probably rich.

If I remember correctly, according to Clarence Lee, the high speed needle valve should be about 3/8" below the top of the tank. Half-way is too low.