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Old 17 October 2011, 06:07   #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, 06:46   #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, 06:52   #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, 07:12   #4
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Quote:
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, 07:35   #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, 07:42   #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, 09:06   #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, 14:57   #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, 16:17   #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, 05:56   #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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