Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 102Get this manual
CONTROL SYSTEM ADJUSTING THE THROTTLE CONTROL CABLES (F6AMHF6MH, F6BMH, F8CMHF8MH) NOTE:
Before adjusting the throttle control cables, make sure that the shift control cable is properly adjusted (for long handle model only) 1Check: Throttle control cables Damage ReplaceExcessive slack or the stoppers do not contact each other Adjust2Adjust: Throttle control cables Adjusting steps: (1)Turn the throttle grip to the fullyopened position(2)Loosen the locknut 1(3)Adjust the length of the throttle wire with the adjusting nut until the stopper portion on the pulley contacts the stopper portion on the throttle wire stay 5(4)Tighten the locknut 1(5)Loosen locknut 6(6)Adjust the length of the throttle wire with the adjusting nut 8