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Old 14 June 2008, 15:30   #1
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Country: UK - England
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Boat name: nogo
Make: avon
Length: 5m +
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new engine advise please

hello ive got a old avon searider 5.4 and am looking to buy a new engine for it , but im a bit worried about putting a engine thet is too heavy for it ,ive still got the flooding hull so it sits lower than most, i was looking at mariners but thought a bit big so im looking at tohatsu's tldi engines, im not bothered about speed as long as gets on the plane with 3 adults on board
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Old 15 June 2008, 13:18   #2
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Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
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Quote:
Originally Posted by avon5.4 View Post
hello ive got a old avon searider 5.4 and am looking to buy a new engine for it , but im a bit worried about putting a engine thet is too heavy for it ,ive still got the flooding hull so it sits lower than most, i was looking at mariners but thought a bit big so im looking at tohatsu's tldi engines, im not bothered about speed as long as gets on the plane with 3 adults on board
E mail the manufacturer to send Searider 5.4 trensom's specs for max HP & engine weight to decide for the correct purchase. Or wait for a Ribnetter answer.

Happy Boating
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Old 15 June 2008, 15:29   #3
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Most details and specs of Seariders can be found here
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Old 15 June 2008, 15:58   #4
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Quote:
Originally Posted by avon5.4 View Post
hello ive got a old avon searider 5.4 and am looking to buy a new engine for it , but im a bit worried about putting a engine thet is too heavy for it ,ive still got the flooding hull so it sits lower than most, i was looking at mariners but thought a bit big so im looking at tohatsu's tldi engines, im not bothered about speed as long as gets on the plane with 3 adults on board
A friend has that SR and recently downgraded to a Tohatsu 70HP, from a 90. Very favorably.
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Old 15 June 2008, 16:56   #5
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Country: UK - England
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I bought a dealer rebuilt yamaha 90 (2st approx 1991) for a little over 2 grand 18 months ago. What an upgrade from the 60 I had before. Nos will probably agree but my advice would be go for a 90 2 stroke to get the full bang for the buck.

4 strokes are just too heavy for the 5.4.

Ian
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Old 16 June 2008, 05:29   #6
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I was perusing engine specs a few nights ago, and was gobsmacked to find out that some Honda 4- strokes are as light as some 2-strokes for the same power.

I was looking around the 50/60 mark, but I'm sure there's a similarity higher up the power range.
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Old 16 June 2008, 10:59   #7
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i was going to get the tohatsu engine then i looked at mariner engines and the 60 bigfoot might be a bit better as its a lot lighter so i might put more money and get that engine, it all depends on how long they take to deliver them. plus ive had mariners before and they were great.
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Old 16 June 2008, 11:44   #8
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max weight would be max 175 kgs, so a single 90 is ideal,or twin 40 s, But not to exceed 175 kgs,
Yam 90 2 stroke or tohatsu 90 tldi at 143kgs is the only ideal up to date engine,the craft would be well balanced and NOT stern happy,
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Old 18 June 2008, 08:04   #9
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I use to have a 5.4SR with a yamaha 90 2 st. I use to frequently have 6 divers with their scuba gear onboard and it would get on the plane easily and cruise at 20 kts at 4000rpm. If I was to have another 5.4 SR I would put 90 hp on the back again. There is nothing worse than an under powered boat.Just because you have 90hp on the back dosn't mean you have to use all of it all the time and at cruise your not flogging the motor. You need to keep the weight of the motor to a minimum so a 4S would be too heavy.
As someone noted the SR dosen't have much freeboard at the transom so you can't have people sitting near the stern, when the boat is at rest.
I have a tohatsu 90tldi on my current hard boat and are very happy with it. After 6 months of not using it,I just sqeeze the fuel primer bulb and turn the key and it starts first time.
The 5.4SR is a great RIB.
hope this helps

rpm
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Old 18 June 2008, 10:12   #10
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Etec 90HP?
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