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Old 17 August 2009, 06:35   #1
Country: UK - England
Town: St Austell
Make: tohatsu
Length: 4m +
Engine: Outboard
Join Date: Jun 2009
Posts: 5
Engine Upgrade

Hi all

Like some advice please. I have a 4M RIB rated at 40hp. It currently has a Tohatsu M25C3 uprated to 30hp mounted. I have got a new two stroke Tohatsu M40D2. The relative weights of the engines are:

M25C3 51kg
M40D2 72kg

My question is - could I just swop engines or should I install some transom strengthening bars first.


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Old 17 August 2009, 07:53   #2
spartacus's Avatar
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,059
If the boat is rated for 40hp, then you shouldn't need to reinforce the transom. Take a closer look at the boat serial plate, it will have a maximum permitted weight for the outboard.
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