No clue on the idling speed problem. The clutch is what I call a Reeves drive, it is used on some woodworking and metal shop equipment. No experience with that one, but you have to "calibrate" new ones. With the engine change out, and a used belt that has stretched over tome you might have to figure out how to "calibrate" the clutch.
Combat Infantryman, the ultimate hunter where the prey shoots back.
"Illegitimus non carborundum est"_______ Old style calls for today's outdoorsman_________