60hp four stroke on 4.9m rib

[davis]

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.

[DJL]

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).

[wavecrosschris]

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.

[Mbryant]

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

[martx007]

No should be fine. My Yam 480R is rated to 75HP engine.

[Mark]

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!

Mark