The two stroke Yamaha 15hp outboard. Ya gotta love the thing. There’s good a reason they’ve sold a gazillion of them worldwide. As long as you’ve got oil in the gas, it’s hard to kill them. Just about any place on the globe you want to cruise, you’ll find parts and someone to fix it if you can’t. They’re dead simple to repair and maintain. For example, to rebuild the carburetor takes me less then an hour from start to finish. The water pump impellor, which was the first time I replaced one on this motor, took about an hour and a half. Spark plugs, ten minutes. You get the idea. So anyway, here’s the pictorial of the impellor replacement.
Re-assembly is basically the reverse order. Remember when sliding the lower unit back on, you may have to turn the prop to line up the splines on the shaft. When the lower unit is about a quarter inch from mating up, re-connect the shift coupler. You can move the shift lever back or forth if it helps to bring the shift rod closer to the coupling. When the coupling is tight, then you can tap the lower unit up until it mates. Tighten the four bolts up and you’re done. Easy, easy….