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Old 28 January 2008, 19:15   #1
spartacus's Avatar
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,390
Upgrade S/S prop - Yamaha 40HP?


Has anyone ever upgraded their standard aluminium propeller on a 40hp engine? My Yamaha outboard is a 1995 (40V), autolube, 2-stroke, 3 cylinder, long-shaft unit.

Normally there are 3 adults on board, fishing gear and around 50 litres of fuel. I'm adding a Tohatsu 3.5hp auxilliary in the Spring - so there's another 15kg of ballast for starters!

Yamaha standard specification is 12 1/4 diameter x 9 pitch (G). I know they have a performance series stainless-steel 3-blade propeller, but it won't be cheap!

Any thoughts?

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Old 28 January 2008, 19:25   #2
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
Originally Posted by spartacus View Post

Any thoughts?
Maybe downgrading the prop might be an option with that weight.

Best bet might be to go rouns a few local outboard shops and see if they would be kind enough to lend you a prop to try some different options.

Don't know if that would be an option for you. Only other thing to do is see if anyone else on here has a similar setup to you.

Best of luck NR.

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Old 29 January 2008, 13:21   #3
Country: UK - England
Town: Brum
Boat name: UTV
Make: zodiac FR
Length: 3m +
Engine: 2 stroke 15hp
MMSI: 999
Join Date: May 2003
Posts: 379
I have used a solas SS 14 pitch on a zodiac 4.2 pro with a 25hp 4 stroke mercury, It didnt run to well reckon 4500 rpm max 24 mph. I have also run an old 2 stroke mariner 40 hp on a flatacraft force 4 with a 15 pitch which ran fine. I would try an Ali 13 pitch prop on yours plenty available on ebay
Big waves, small boat ;)
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