Yamaha Outboards 3P Service Manual, Page 56Get this manual
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CLUTCH DOG AND COMPONENTS 1) Visually inspect the clutch dog, looking particularly for rounding of the dog edge, cracks and other signs of damage or wearIf the dog is excessively roundedinspect also the mating gear, and replace both if necessary
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DRIVE AND PROPELLER SHAFTS 1) Visually inspect the shafts, looking for grooved wear on the surface in contact with the bearings and oil-seals, and checking for wear on the splinesReplace if worn or damaged