How does this happen?
This is what the impeller in my BF45 outboard looked like today when I opened it up. The tell tell stream had been weak and when I replaced the thermostat I found an impeller vane. Turns out the vane must have been from another impeller because this one was not missing any but the vanes where going in different directions.
I used a complete Honda kit to replace all the water pump parts and replaced all the old parts. Took the boat to the lake and the tell tell was worse than before. Took it apart again and found this.
I've put it back together and now the tell tell is strong, any idea what happened when the vanes got out of whack?