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Old 05 August 2013, 21:05   #11
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I'd lean towards the Etec on paper, but Davybouy on here has an SR5.4 with a TLDI 90 on and its apparently quite good.

Avoid the opti 90, it's a downtuned 115 and is physically huge as well as heavy.
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Old 05 August 2013, 21:15   #12
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If you can't find a Yamaha 90hp 2 stroke go for a 90 etec, Bushrider just did the round Ireland challenge on his so he's the man when it comes to feedback for a 90 etec set up
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Old 05 August 2013, 21:17   #13
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Quote:
Originally Posted by Nos4r2 View Post
Avoid the opti 90, it's a downtuned 115 and is physically huge as well as heavy.
Didn't even include it for that reason.


Made a chart for myself earlier today, attached.

Excluding the 115's, the which have ratio's of .63-.68 hp/kg, the Etec is next at .62 hp/kg and then the Yami F70 at .60hp/kg followed closely by the the Tohatsu/Nissan and the Suzuki. What I never would have guessed is that the Honda 90 is a slightly better hp/kg ratio than the Yami F90!
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Old 24 January 2014, 16:38   #14
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Old thread but still haven't found a decent two-stroke Yami 90 that's not $3,500-$4,500. And they're all ~20 years old!!!

Just found a mid-90's 70hp two-stroke Yami, good compression, etc. - $1,200. Very tempted...

Sorry, had to vent to you guys!!!
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Old 30 October 2015, 19:32   #15
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This might be irrelevant as this thread is old but I went with a Yamaha F70LA on my 5.4 Searider and it's worked out very well for me. I've got a home-built pilothouse on the boat and still get 28+kts flat out with 2 people plus gear on board. For my purposes (cruising) it's great as it's really economical to run and pretty quiet compared to the 2-stroke Merc I replaced.
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Old 03 November 2015, 09:35   #16
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Would you be willing to Rebuild an engine? There are plenty of dead Yams about, and spares are pretty easy to find (don't ask how I know! )

Proably a bit academic but waaaay long ago I did my "Sportsboat - rescue endorsement" at a Centre on the Clyde who had an SR5.4 with twin 30s (they also had a small fleet of SR4s with single 30s - the twins o nthe 5.4 were there for spares standardisation etc)... anyhow, during the early days of automixing (1987-ish?) the 5.4 ended up for a while being the only one running premix engines at the centre.... well, you can guess what happened.

I can confirm an SR5.4 will plane 5 (may have been 7 - it was long ago!) up with an offset 30Hp on the transom!
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Old 03 November 2015, 10:48   #17
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I can confirm an SR5.4 will plane 5 (may have been 7 - it was long ago!) up with an offset 30Hp on the transom!
That's amazing.
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Old 03 November 2015, 12:13   #18
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This thread is very curious for me as well.

My best research for my 1998 Avon D560 reveals it is based on the Searider 5.4, with no water ballast hull, hull weight of 735 lb, and +1.5" larger tube diameter. It has a max hp rating of 115hp, but in the technical specs, it does not list a maximum engine weight.

For my D560 hull, the tech specs specify:
Minimum 50hp with an approx performance of 30 mph.
Maximum 115hp with an approx performance of 55 mph.

I'm thinking about repowering my D560 with a 2016 Yamaha 115 VMAX SHO 4st. The transom is a little punky, so I'm going to strip it down and rebuild it first.

Tech specs for 1998 below:
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Old 03 November 2015, 13:08   #19
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Quote:
Originally Posted by office888 View Post
This thread is very curious for me as well.

My best research for my 1998 Avon D560 reveals it is based on the Searider 5.4, with no water ballast hull, hull weight of 735 lb, and +1.5" larger tube diameter. It has a max hp rating of 115hp, but in the technical specs, it does not list a maximum engine weight.

For my D560 hull, the tech specs specify:
Minimum 50hp with an approx performance of 30 mph.
Maximum 115hp with an approx performance of 55 mph.

I'm thinking about repowering my D560 with a 2016 Yamaha 115 VMAX SHO 4st. The transom is a little punky, so I'm going to strip it down and rebuild it first.

Tech specs for 1998 below:
It's only since the advent of the lardy 4stroke that weight has become an issue. Before, makers could confidently rate the transoms by HP in the knowledge that whatever engine went on it the weight wouldn't be an issue. Then 4 stroke fever came along & people were sticking 90hp Hondas on the back that weighed as much as a 150hp 2 stroke.
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Old 03 November 2015, 13:34   #20
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Quote:
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It's only since the advent of the lardy 4stroke that weight has become an issue. Before, makers could confidently rate the transoms by HP in the knowledge that whatever engine went on it the weight wouldn't be an issue. Then 4 stroke fever came along & people were sticking 90hp Hondas on the back that weighed as much as a 150hp 2 stroke.
Note that there are max transom weights for the Searider, but not the Adventure.

A lot of the transom weight capacity of inflatable boats simply has to do with the tube diameter, tube design, and hull flotation. Hence when Zodiac changed the Futura from pointy to truncated?
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