Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 122Get this manual
POWER UNIT 3Adjust: Intake valve clearance Exhaust valve clearance Adjusting steps: (1)Loosen the locknut 8(2)Turn the adjusting screw in or out until the specified valve clearance is obtained(3)Tighten the locknut 8Locknut: (0.8 kgf m, 5.9 ft lb) (4)Perform the above steps for all valves which clearance are out of specification4Recheck: Intake valve clearance Exhaust valve clearance b