1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 23Get this manual
Throttle linkage adjustment in neutral 1Set the shift handle to forward position and turn the throttle grip to "FAST 2Push the magneto control lever by finger until it contacts the stopper stay 5Start the motor
When starting the motor, be sure to mount the motor on the test tank so that it can be water-cooled6Connect the tachometer leads to the lighting coil leadsNOTE:
For tachometer use, read the tachometer operation manual
1Magneto control lever
2Stopper stay
Loosen the lock nut and adjust the length of the joint link as shown in the illustrationLoosen the stopper bolt lock nut on the magneto control lever, and loosen the stopper bolt