Needle & Seat
CTPA-17C121 Replacement Part to Fit:  John Deere "For Models: (M, MT, 320, 330, 40, 420, 430, 50, 520, 530, 60, 620, 630, 70, 720, 730 ALL W/ TWO BARRELL CARBURETOR)"  Price:  $4.54  Buyers Club Price:  $4.09