What outboard should I buy?????

[jezza2011]

Mariner 75 and 90 are also the same engine. well at least the 2 strokes were.
the newer ones were also the same from what I remember
.

[Bulldog]

Looking at a yam 130 2stroke what you lot think I spoke to outboard guy in hamble and he said with the transom being 60mm thick it would take unto 150hp ish ???.

[Boats&Outboards]

Originally Posted by Bulldog

Looking at a yam 130 2stroke what you lot think I spoke to outboard guy in hamble and he said with the transom being 60mm thick it would take unto 150hp ish ???.

It's it's the one I think it is make sure it's actually a genuine item to sell. There's a lot on the Market that's very very cheaply priced at the moment which makes you wonder....

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[chewy]

Originally Posted by Bulldog

Looking at a yam 130 2stroke what you lot think I spoke to outboard guy in hamble and he said with the transom being 60mm thick it would take unto 150hp ish ???.

Depends how well its been built, might be worth giving your insurance company a bell too...

[Poly]

Originally Posted by Bulldog

Looking at a yam 130 2stroke what you lot think I spoke to outboard guy in hamble and he said with the transom being 60mm thick it would take unto 150hp ish ???.

The thickness of the transom is only part of the problem. How well is the transom bonded to the rest of the boat (most of the transom problems people post here are movement at this joint not the transom itself breaking). Of course can you control the boat at full throttle is another issue - although you can of course not use all the power, but the maximum is not just about ripping the transom off - its about flipping the boat, chine walking, etc.

Given the previous owner thought 90HP was too much, and 99% of people would be happy with a 90HP on a SR5.4, and you should need less power with a shallow V, 130HP does sound OTT to me. Even if the boat can take it - with the rougher ride you might expect then in the conditions when you might want that extra power you probably can't.

[captnjack]

Your cabin RIB looks like this Zodiac to me, just a little smaller.
http://www.rib.net/forum/f47/zodiac-...rds-41635.html

Your's is a little smaller but that Zodiac with twin 70s suggests that something like a Yam115 would be a good match for you. 90hp probably ok. 75hp seems quite a bit underpowered to me.

[Neil Harvey]

Originally Posted by captnjack

Your cabin RIB looks like this Zodiac to me, just a little smaller.
http://www.rib.net/forum/f47/zodiac-...rds-41635.html

Your's is a little smaller but that Zodiac with twin 70s suggests that something like a Yam115 would be a good match for you. 90hp probably ok. 75hp seems quite a bit underpowered to me.

interesting, if it's a zodiac, then a 540 is rated to 90hp according to this file:-
Zodiac Milpro - Hurricane Ribs - Outboards

[9D280]

Originally Posted by chewy

Yam 75 and Yam 90 are the same weight, be rude not to stick the 90 on

Aye, absolutley, I was thinking more along the 90 vs a 115 that is a derated 150 kind of thing would be a whole different kettle of fish, bearing in mind the rest of the discussions above.....

Originally Posted by Polwart

The thickness of the transom is only part of the problem.

For what it's worth, mine is 50mm. From memory (anyone car to confirm / correct?) the SR5.4 is also 50mm. 5.4 is rated to 90, mine's only rated to 60. No bracing struts on mine.....

[jcjcat]

The engine torque is the right parameter to consider - not the peak power. Plus reliability indeed !

To get the torque high, I would suggest to choose the cubic inches nr as high as possible, and the weight as low as possible !
Then you will go to an old 2 stroke carbureted engine, it will give much more low end torque than a 4 stroke.

Among the 90hp's, I would choose the Tohatsu, and in the 115/130 there is the V4-Yamaha

[9D280]

If you want torque go for a long stroke engine. Yam 55 of yore being a prime example.

Torque = force x distance. Longer stroke means the crank needs to be further away form the shaft centreline to allow the piston al lthe way down. - Distance increases. Plus you also get a high compression due to the proportial squeze of the piston moving further.