[biglenr]

Per Yamaha's site, the serial number is on a sticker which is long gone from the motor....

The ex-wfe needs a new prop for the boat, and swallowed her pride long enough to ask me to ask y'all if you can help her find out what she needs.

I know somewhere between zilch and very little about outboards.... I'm not much help here.

Can anyone tell her what type of prop she needs to get for a late 80's 2 stroke Yamaha 70HP (fuel injection, if it matters). Pontoon boat, so don't need speed, just general purpose.

 

[Drum Runner]

If she has a prop on the motor, the size and pitch are probably on the hub.

Call a prop shop is another option. They'll know what wheel goes on it and the pitch she needs for a pontoon.

 

[204Angler]

+1. 99% of the time prop size will be on hub or stamped on prop

 

[sundrop]

yep should be on the prop somewhere either a size or a part number.