2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 87Get this manual
Carburetor unit
S6AG4250
3Install the pilot screw 9, turn it in until it is lightly seated, and then turn it out the specified number of turns
S6AG4181
NOTE: To adjust the throttle link rod, see "Adjusting the throttle link" (3-7) Place the Prime Start connectors in the junction box after connecting them3Adjust the engine idle speedS6AG4260
Pilot screw setting: F15: 18 12 turns out F20: 34 12 turns out