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Old 21 August 2009, 10:10   #1
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Country: Ireland
Town: cork
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Make: HUMBER DESTROYER 5.8
Length: 5m +
Engine: 140HP sUZUKI
Join Date: Dec 2007
Posts: 262
MERCURY 90HP 4 Stroke ???

Looking at a few boats that have 2005 Mercury 90hp 4 stroke engines.

What do people think of these? good,reliable or whats your thoughts?

What to look out for when giving one a once over?
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Old 24 August 2009, 07:53   #2
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Country: Ireland
Town: cork
Boat name: none
Make: HUMBER DESTROYER 5.8
Length: 5m +
Engine: 140HP sUZUKI
Join Date: Dec 2007
Posts: 262
Quote:
Originally Posted by ciaranp View Post
Looking at a few boats that have 2005 Mercury 90hp 4 stroke engines.

What do people think of these? good,reliable or whats your thoughts?

What to look out for when giving one a once over?
anyone??
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Old 24 August 2009, 08:03   #3
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
If you do a search on here, you'll find some horror stories of these motors suffering corrosion in the waterway around the joint between the powerhead and water tube/mid section. IIRC, the metal casting is very thin and corrosion can cause it to disintegrate, requiring a replacement cylinder block.

Other than that, I believe they're pretty rock solid.
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Old 25 August 2009, 07:01   #4
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Country: UK - Scotland
Town: Ardfern
Boat name: Moon Raker
Make: Humber Destroyer
Length: 5m +
Engine: Honda BF 90 D
MMSI: 235035994
Join Date: May 2006
Posts: 694
Quote:
Originally Posted by Downhilldai View Post
If you do a search on here, you'll find some horror stories of these motors suffering corrosion in the waterway around the joint between the powerhead and water tube/mid section. IIRC, the metal casting is very thin and corrosion can cause it to disintegrate, requiring a replacement cylinder block.

Other than that, I believe they're pretty rock solid.
AFAIK it was some of the early 90 4str engines with carbs that had that problem - around year 2000 (which is the age of mine ) It was caused by a poor choice of metal for the adapter plate that allowed the Yamaha engine to be connected to the Mercury leg. I think they've fixed it.

I think the 2005 engines are not Yamaha based, are fuel injected, and I don't think anyone's moaned on here about them. Mine's a different engine, so that's why I said nowt.

Notwithstanding my recent electrical problem (which is the first failure I've had), my engine has been reliable. It seems well made and fairly easy to work on.
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