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Old 17 October 2011, 05:07   #1
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Avon Searider 5.4 engine

Hello,

I need to change my current engine (2 stroke Force 85 HP) for the new one.
I have a question for you. What size of engine would be the best for my RIB?
I went for our local shop and guys told me 75 HP 2 stroke might be little bit to small.

What you recommend? 90 HP? 115 HP? 2 or 4 stroke?

Thank you.
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Old 17 October 2011, 05:46   #2
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Depends what you want to do with it. A 50 HP 2 stoke will move a SR5.4 quite happily but not put quite the same grin on your face that the 85 would have. IIRC then the SR experts on here regard the "perfect" engine for a 5.4 as a 90HP 2 stroke.
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Old 17 October 2011, 05:52   #3
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Quote:
Originally Posted by zubol View Post
Hello,

I need to change my current engine (2 stroke Force 85 HP) for the new one.
I have a question for you. What size of engine would be the best for my RIB?
I went for our local shop and guys told me 75 HP 2 stroke might be little bit to small.

What you recommend? 90 HP? 115 HP? 2 or 4 stroke?

Thank you.
I have driven the clubs 5.4 woth a 60hp 4 stroke Yamaha. Its fine with a small load but sluggish when loaded. I personally would have gone for something bigger...perhaps 80..
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Old 17 October 2011, 06:12   #4
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Originally Posted by Polwart View Post
...the SR experts on here regard the "perfect" engine for a 5.4 as a 90HP 2 stroke Yam.
Fixed
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Old 17 October 2011, 06:35   #5
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Quote:
Originally Posted by Downhilldai View Post
Fixed
I very nearly wrote that...
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Old 17 October 2011, 06:42   #6
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From what I've read on here the Yam 90 is the perfect engine with the Twatsoo 90 following it.
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Old 17 October 2011, 08:06   #7
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What you think about Yam 115 V4? it is not too much?
and what about Mercury 75HP 2 stroke. Is it really too small?
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Old 17 October 2011, 13:57   #8
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Quote:
Originally Posted by zubol View Post
What you think about Yam 115 V4? it is not too much?
and what about Mercury 75HP 2 stroke. Is it really too small?
max is normally 90hp, but some were rated to 115 apparently

75 should be ok, although maybe a little slow especially if well loaded
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Old 17 October 2011, 15:17   #9
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I would think a 75hp will be fine. I had a 90hp Mariner on mine and didn't often think it was in any way underpowered.

Most of the time I ran around at mid to high 20's kts and 75hp would have been plenty.

However, having said that, if I were speccing an engine I would by choice have a 90.
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Old 18 October 2011, 04:56   #10
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What weight are we talking about? what is the max for the engine?
I am asking because 2 stroke Yamaha 90HP is 118kg where for instance Honda 90HP is 163kg
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Old 18 October 2011, 08:02   #11
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90hp suzi

I have a 90hp suzi driving my SR5,4 and know lots of people who sail them it's very fuel efficient super and quiet (has a lock on it to prevent re starting!!!)
14'x21' prop should do the trick really well.
Engine weighs 158kg

Yam 2 stroke 90 is super to but nog new available and i would make the same decision again.

see on Avon Searider - Home for few pics (look at member Rob Ubels)

115 is possible to faster but you hear it guzzling the fuel. (almost above the engine noise)
130 should go to but to crazy and to fast wouldnt do both

just take a 90 4s suzi or 90 2s yamaha
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Old 19 October 2011, 16:21   #12
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I just repowered my 5.4 this summer with a new Yamaha F70LA 4 stroke. I couln't be happier with the engine as it is lighter and smaller than the old 2 stroke merc 70 i replaced. I have a pilothouse on my boat and even with 2 people, surfboards and gear for the weekend, i still hit 29-30kts which is plenty for ocean running. The engine is quiet and quite good on fuel, i get 6-7 nm/gallon.
I read yamaha redesigned this engine as there are a lot of boats out there that were conceived for a 70 2stroke that suck with the extra weight of a 4 stroke, so they pulled tons of weight out.
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Old 19 October 2011, 16:25   #13
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F70 is 118kg

http://continuouswave.com/whaler/ref...70HotSheet.pdf
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Old 21 October 2011, 15:10   #14
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That weight was the reason I choose Yam 70 for my new XS 530
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