1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 44Get this manual
Install the float chamber, main jet and gasket Insert the pilot screw into the spring and screw it in until tightNext, back it out 1-38 turnsAvoid tightening the pilot screw too hard as that could damage the tip Secure the accelerator arm to the carburetor body with the pinThe pin should be inserted from the opposite side to the fuel pump and lightly tapped with plastic hammer until its flange contacts the carburetor body NOTE:
The joint link must be adjusted after the carburetor is installedRefer to page 2-7