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Old 05 August 2011, 06:54   #1
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Country: UK - England
Town: poole
Boat name: Wacky 1
Make: Flatacraft
Length: 3m +
Engine: 25hp mariner outboar
Join Date: Jun 2010
Posts: 28
More power!!

Guys ive heard talk of 25hp and 30hp engines being exactly the same, but with minor differences on the 25hp to reduce power.
is this true? is it easy to make the 25 have the full 30 horses?
oh and do the extra 5 horses weigh much??
thanks,
Joe
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Old 05 August 2011, 10:59   #2
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Country: UK - Scotland
Town: Isle of Lewis
Boat name: Fiona
Make: Avon SR
Length: 5m +
Engine: Yamaha 90AETO
Join Date: Aug 2009
Posts: 38
There are some engines that have the same block as a greater powered engine. It's usually the carbs that are different and I wouldn't expect them to way more. Dont think it's really worth doing unless you have the greater powered engine lying around with a knackered block.
Dan
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Old 05 August 2011, 11:03   #3
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Depends on the engine. It can vary from a simple restrictor plate to a replacing half the engine.

Some also limit the spark advance on the 25, and as you generally can't reprogramme the CDIs that becomes a chuffing expensive component swap.

Also check the brochures of your engine (I assume the Mariner). Not all manufacturers twinned those two on the same block!

Have a search here - there's a few posts about this game.....
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