Yamaha 25BMH 30HMH Factory Service Manual, Page 180Get this manual
CARBURETOR
4Install: Packing Cover Screw Spring Pilot screw 5
CAUTION: Do not cause damage to the tip of the pilot screw by over-tightening it5Adjust: Pilot screw Adjusting steps (1) Screw in the pilot screw until it is lightly seated(2) Back out by the specified number of turnsPilot screw turn-out14 34