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Old 12 January 2007, 16:43   #1
Country: Ireland
Length: 5m +
Join Date: Nov 2006
Posts: 90
60hp four stroke on 4.9m rib

Has anyone any advice , is a 60hp four stroke Mariner too heavy for a 4.9m rib
I have seen on here where a lot of people think that two stroke performs better. Has anyone such an engine on a rib that size and what is their view, thanks in advance.

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Old 12 January 2007, 17:35   #2
Country: UK - England
Make: Ribcraft 6.5
Length: 6m +
Engine: Suzuki DF175TG
Join Date: Apr 2002
Posts: 929
I had the Merc F60 EFI on a 4.7m Tornado. The EFI four stroke performed much better than the carburetted Merc two stroke 60 I had previous.

Weight wasn't a problem at all (only 10kg between the 4 and 2 stroke).

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Old 12 January 2007, 18:45   #3
Country: UK - England
Town: Aylesbury
Length: no boat
Join Date: Jul 2006
Posts: 345
Weight wise, I'm sure someone will be able to answer your question here exactly if you can give details of the RIB you have/are looking at.

I would say on a 4.9/5m RIB a 60 four stroke would be the optimum choice. Mine is only just 4.5m and have seen 32+ knots across a bumpy solent sea with two people. This year I want to see what it will 'actually' do - I'd guess around 37 knots on a smooth day maybe 39/40 if i'm lucky.

Depending on what 4.9m RIB you are sticking it on and how heavy it is with a slightly longer hull you could probably get similar if not better perfomance than this. As to 4s/2s argument, 2 strokes are cheaper to service and cost less initially but use more fuel and in my view are a pain to fill up.
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Old 13 January 2007, 10:04   #4
Country: UK - England
Town: Fareham
Make: Ribcraft
Length: 6m +
Engine: Suzuki 175Hp
Join Date: Oct 2006
Posts: 107
I did my PB2 on a Ribcraft 4.8 with the 4stroke mariner, didnt seem to big or heavy handled v well n quick although only 2 up
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Old 13 January 2007, 11:41   #5
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Country: UK - England
Town: Wigan
Boat name: Rosemary
Make: Yamaha
Length: 4m +
Engine: 50 Honda 4st
Join Date: Aug 2006
Posts: 64
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No should be fine. My Yam 480R is rated to 75HP engine.
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Old 15 January 2007, 16:00   #6
Country: UK - England
Town: Malmesbury
Boat name: Gladiator
Length: 4m +
Engine: Outboard, Petrol, 50
Join Date: Jun 2004
Posts: 39
I'm running a 4.9M RIB with a Honda BF50 engine. There's plenty of power available and I've never really felt that I need anymore.

My RIB has a Max 70HP engine rating. The thing would really fly with a 70HP engine!


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