1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 86Get this manual
Steering handle 1As shown, insert the knee gear (steering handle side) and throttle friction2Mount the bushing, compression spring, and washer on the knee gear shaft, and insert the steering handle assembly so that the throttle indicator is at FAST3Align the knee gear shaft screw hole with the steering handle screw hole, install the screw, and tighten Throttle mechanism 1As shown, align the marks on the gear and pinion, and secure the bushing to the bottom cowling with two bolts