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Old 21 September 2006, 08:39   #1
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How many hours are modern outboards good for?

Hi,

I have heard varying figures from 900 hours to 3500+ hours. Also, there seems to be a big difference between 2 & 4 stroke with the general opinion that 4 strokes should last longer?

I would really appreciate your thoughts.

Cheers,

Tony.
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Old 21 September 2006, 09:00   #2
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Quote:
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...the general opinion that 4 strokes should last longer?
A 4-stroke has more moving parts, so in theory should have a shorter life...
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Old 21 September 2006, 09:06   #3
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Quote:
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A 4-stroke has more moving parts, so in theory should have a shorter life...
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Old 21 September 2006, 09:38   #4
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Valve gear, pushrod or camshaft.

Moving parts mean mechanical wear.

Both 4/ and 2/ will have either carbs or a fuel injection system.

It's all a bit academic anyway.... a lot must depend on the characteristics of the particular engine and how it's used and maintained.
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Old 21 September 2006, 10:05   #5
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Quote:
Originally Posted by Richard B
A 4-stroke has more moving parts, so in theory should have a shorter life...
Interesting theory.....
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Old 21 September 2006, 11:55   #6
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Quote:
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A 4-stroke has more moving parts, so in theory should have a shorter life...
Ah but you could say that all the wear is split between a greater number of parts so should last longer cos each bit will therefore wear slower

In answer to the original question I have read loads about engines blowing up but never about one wearing out of sheer old age so I don't think they ever get to the end of their days naturally, by the sound of it?
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Old 21 September 2006, 13:38   #7
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The Yanks use their outboards a lot more than most(cheap fuel) - most of the commercial fishermen reckon on getting 2000hrs+ 2 stroke or 4 stroke. Of course they will only last as long as they are looked after!!!
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Old 21 September 2006, 13:44   #8
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1000 hours on a 150optimax apparently according to a Southern Merc dealer.
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Old 21 September 2006, 14:13   #9
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1000 hours on a 150optimax apparently according to a Southern Merc dealer.
Just guessing but to put a time frame on that for the average user would it be fair to say about 5 years use then.

Put in that context it doesn't seem a lot.
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Old 21 September 2006, 15:14   #10
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our work twin f115's managed 1300 hours before human error messed them up a bit!!!!

lets just say something went in the tank that shouldn't have been anywhere near a fuel nozzle!!!
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