2-speed Outboard? Anybody Seen This Before?

[evansmarine]

What boat so i can see what I have here

[Walker]

Airplanes do something similar using oil pressure to vary prop pitch.

A bit more complex. Most propeller-driven airplanes have a "constant speed prop". You set the desired propeller RPM with one of the engine controls. The engine governor then varies the prop pitch using engine oil pressure to try to maintain that RPM. A typical WOT max RPM (takeoff power) is 2700 RPM, and cruise power is 2400 RPM.

[FishNette]

What boat so i can see what I have here

The outboard is a 1984 Yamaha 175. I think it needs to be about 14 1/2" Diameter X 17" pitch, 4-blade, SS. Let me know what ya got.