1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 41Get this manual
2 Carbu retor
Using 12 mm wrench, remove the main jet, and remove the float chamber and the float
1Pilot jet
1Main jet
2Float chamber
Pull out the float pin, and remove the float armNext, remove the needle valve in the valve seat and, using 10-mm box wrench, remove the valve seat