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Old 22 October 2013, 02:09   #1
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Prop ideas for SR5.4 & yam 90?

I recently acquired a 2002 SR5.4 with a 2002 yamaha 90hp 2-stroke on the back.

The aluminium 15 x 17 prop has a few nicks on it so I'm thinking of getting it refurbed but before I do I was wondering if it is actually the best suited prop for my set up or whether I should go for a new prop of a different size?

Has anyone got experience of my rib/engine combination? I'd appreciate any advice people might have.

Should probably mention I have a blocked hull.
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Old 22 October 2013, 14:27   #2
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Hello

Usually yam props for that engine were (from memory) 13.5" x 13, 15, 17, 19 or 21". If you are loading the rib with fuel, crew & kit, you would look at the 15 pitch. The 17 would be a good utility choice.

As you have a damaged prop, you won't know the current RPM, which is a pain. A standard yam alloy or the black stainless is a good choice. I have seen a lot of premature shock absorber (rubber) bush failure in other makes.

It always boils down to what you are doing, but you are looking to be at 5000-5500 rpm at full throttle. Unless you are really picky, finding a prop that tops out at 5300 is a good compromise when fully laden, then you will get the extra rpm when lighter.
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Old 22 October 2013, 16:22   #3
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i always use 13/1/4 by 19 pitch all which gave me 39 knots . one person, heavy consol and 30 litres of fuel
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Old 22 October 2013, 18:15   #4
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I ran my dory eurosport on a 19p with a 90 no problems and for one up cruises I had a 21 p 5800rpm over 40 it flew
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Old 22 October 2013, 20:59   #5
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You won't swing a bigger prop than a 19" on a Yam 90/SR5.4.
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Old 23 October 2013, 04:16   #6
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Thanks all. Kind of confirms my thinking that a new prop is a good idea. I'll keep the other as a spare.

Anyone know a good prop supplier in/near Bristol?
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Old 23 October 2013, 07:05   #7
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Steel Development can refurb your prop for you.


Google is your friend.
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Old 23 October 2013, 13:20   #8
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Quote:
Originally Posted by A1an View Post
Steel Development can refurb your prop for you. Google is your friend.
Thanks A1an

Took another look at the prop this evening it has 13X19 K written on it.

So think I'll get it refurbed then see what rpm that gives me at WOT before deciding if I need anything different.
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Old 23 October 2013, 14:04   #9
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13X19 K has been best choice so far om mine 5.4 /90. Defo not a 19 black max....
Will test a 17 ballistic next weekend weather permitting. Will report outcome.
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Old 23 October 2013, 14:23   #10
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Originally Posted by C-NUMB View Post
Will test a 17 ballistic next weekend weather permitting. Will report outcome.
I tried a 17" Ballistic on my 5.4 with a 90 Yamaha but was not very impressed by the performance .
I changed back to an 17" Yamaha K series prop which worked for me best on the SR .
The Ballistic is now on my Buster XL with F100 where it performs excellent !
Perfect whole shot , revīs with 6000rpm , 4 persons on board & tube or waterski no problems.
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