prop size unknown on 13' Whaler with Yamaha 40

drchpete

Seaman Apprentice
Joined
Jun 21, 2009
Messages
37
Boat is a 1992 13 SS with a Yamaha 40 2-stroke (year 2000). Prop is aluminum and is perfectly matched (5500 WOT) but has no markings I can find. Does anyone know either how I figure out what the prop I have is or does anyone know the appropriate size prop for this boat and engine? What prop size is working for others with this boat / engine combo? I have tried the prop-finder tools online but numerous sizes are given.
 

kwikk9

Petty Officer 2nd Class
Joined
Apr 4, 2006
Messages
189
Re: prop size unknown on 13' Whaler with Yamaha 40

My '89 40hp Evinrude on a 13'
SS uses a 12 x 17 aluminum prop. I don't know if it would be different spec. for a Yamaha.
 

drchpete

Seaman Apprentice
Joined
Jun 21, 2009
Messages
37
Re: prop size unknown on 13' Whaler with Yamaha 40

My '89 40hp Evinrude on a 13'
SS uses a 12 x 17 aluminum prop. I don't know if it would be different spec. for a Yamaha.

Yeah, I had an Evinrude 40 when I bought the boat and the stainless prop was 11.75 x 17 x 3. The Yami had an aluminum prop and I want to stay with aluminum but again no stamp on it. Is there any reason it would be different for the Yamaha since they are both 40's? Would it be different because it's Aluminum?
 

Georgesalmon

Lieutenant Commander
Joined
Apr 14, 2012
Messages
1,793
Re: prop size unknown on 13' Whaler with Yamaha 40

Take the prop nut and washer off and look at the hub for prop size.
 

kwikk9

Petty Officer 2nd Class
Joined
Apr 4, 2006
Messages
189
Re: prop size unknown on 13' Whaler with Yamaha 40

There has to be a dealer in the Mystic/Groton area who could help you out, what with all the boats in the area. Take the prop off as suggested and get an eyeball opinion.
 
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