The second entry in the repair tips sticky is a link to doing this on a Merc, very similar to the Yamaha. Pay attention to what it says about aligning the shift rod and the drive shaft when reinstalling the LU. Personally, I prefer to put the engine in gear before I start and am careful not to change it at the LU as I work. When reinstalling, I can hold the LU in position with one hand and wiggle the prop with the other to wiggle the drive shaft into alignment.

Be sure to torque the bolts correctly at the WP (get an inch-pound torque wrench) and where the LU bolts to the motor.

If you will do your own routine maintenance and simple repairs, a Yamaha Service Manual is a <u>good</u> investment.