[Water Warrior 2]

A valve/check and adjustment is usually about one hour by the book. The shop will need the engine to be cold to do the valves. Drop it off one day and pick it up the next. Or if you are in the right area drop it off in the morning and pick it up after work. Quite a few members do their own valves successfully but I opt for a professional to do the job so I don't create a bigger job by really messing things up. It is a talent I developed early in life.
Carbs are very simple overall and there are some very talented carb gurus on the forum to walk you through almost anything short of a direct missile strike.