Needle & Seat
CTPA-AR10114 Replacement Part to Fit:  John Deere "For Models: JD500A SN <-123113 W/ MARVEL SCHEBLER CARB., (3010, 3020 ALL SN <123000 W/ MARVEL SCHEBLER CARB.), (4010, 4020 ALL SN <201000 W/ MARVEL SCHEBLER CARB.), (JD500, JD600 ALL W/ MARVEL SCHEBLER CARB.)"  Price:  $6.80  Buyers Club Price:  $6.12