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21 September 2006, 13:39
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#1
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Member
Country: UK - Wales
Town: Cardigan
Boat name: Bay Explorer/Pioneer
Make: Humber/Quinquari
Length: 10m +
Engine: 2 x ETEC 200hp
Join Date: Sep 2004
Posts: 169
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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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21 September 2006, 14:00
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#2
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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Quote:
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Originally Posted by Tony Barber
...the general opinion that 4 strokes should last longer?
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A 4-stroke has more moving parts, so in theory should have a shorter life...
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21 September 2006, 14:06
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#3
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Member
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
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Quote:
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Originally Posted by Richard B
A 4-stroke has more moving parts, so in theory should have a shorter life...
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JW.
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21 September 2006, 14:38
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#4
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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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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21 September 2006, 15:05
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#5
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Member
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,127
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Quote:
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Originally Posted by Richard B
A 4-stroke has more moving parts, so in theory should have a shorter life...
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Interesting theory..... 
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21 September 2006, 16:55
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#6
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Member
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,726
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Quote:
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Originally Posted by Richard B
A 4-stroke has more moving parts, so in theory should have a shorter life...
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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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21 September 2006, 18:38
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#7
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Member
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
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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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21 September 2006, 18:44
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#8
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Member
Country: UK - England
Town: Dorset
Length: 4m +
Join Date: Oct 2003
Posts: 1,410
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1000 hours on a 150optimax apparently according to a Southern Merc dealer.
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21 September 2006, 19:13
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#9
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Member
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
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Quote:
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Originally Posted by ADS
1000 hours on a 150optimax apparently according to a Southern Merc dealer.
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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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21 September 2006, 20:14
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#10
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Member
Country: UK - England
Town: isles of scilly
Boat name: Still Miss behavin
Make: Ribcraft
Length: 6m +
Engine: 250 suzuki
Join Date: Dec 2003
Posts: 129
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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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21 September 2006, 21:17
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#11
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Member
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,726
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Quote:
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Originally Posted by ADS
1000 hours on a 150optimax apparently according to a Southern Merc dealer.
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That really doesn't seem very much to me. I mean that's like needing a new car engine about every 30,000 miles....
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21 September 2006, 21:19
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#12
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Member
Country: UK - England
Town: N.Wales/Southampton
Make: Zodiac
Length: 3m +
Engine: Honda 15hp
Join Date: Mar 2006
Posts: 449
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Hi
My mates got a Avon sea sport that is 13 years old with a mariner 75 2 stroke on it at that has 2350hrs on it and it is thrashed every summer wakeboarding. And all the other times is spent at WOT.
Still running well.
James
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21 September 2006, 21:20
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#13
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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Quote:
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Originally Posted by BogMonster
That really doesn't seem very much to me. I mean that's like needing a new car engine about every 30,000 miles....
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Yes but I bet the car you're comparing it with wouldn't spend 1000 hours half immersed in salt water! 
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21 September 2006, 21:22
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#14
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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Quote:
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Originally Posted by J S
13 years old with a mariner 75 2 stroke on it at that has 2350hrs on it
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21 September 2006, 23:17
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#15
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Member
Country: UK - England
Town: S.Devon
Boat name: Boatafogo
Length: 6m +
Engine: Outboard
Join Date: Nov 2004
Posts: 39
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Also you can't really compare car and boat engines as most boats spend a vast majority of their life at full throttle, where as cars hardly ever get there.
Honda 225 is 2 years old with 1000 hours and just the usual probs.
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21 September 2006, 23:39
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#16
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Member
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
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Quote:
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Originally Posted by Bluestreak
Also you can't really compare car and boat engines as most boats spend a vast majority of their life at full throttle, where as cars hardly ever get there.
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But outboards cost a small fortune and at the end of the day they are built by the manufacturers knowing that they are going to be used at high revs.
Therefore if they don't last too long then surely thats the manufacturers fault and not the users fault.
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22 September 2006, 00:07
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#17
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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No-one's actually defined what they call worn out yet-is it when things start going wrong or when the internal components are getting beyond tolerance?
There's quite a difference between the two.
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22 September 2006, 07:21
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#18
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Member
Country: Belgium
Make: Osprey
Length: 7m +
Engine: 250 HP E-Tec
Join Date: Nov 2004
Posts: 258
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In Africa i have seen a pair of Yamaha's carb. 115 HP with 5200 hours each.
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22 September 2006, 20:08
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#19
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Member
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,409
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I regularly see MOD Mariner 75hp/90hp Two strokes in for overhaul with upto 9000hrs on the hour meters!!. They get a make over an go back to work again.
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22 September 2006, 20:56
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#20
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Member
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,726
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Quote:
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Originally Posted by Turbodiesel
I regularly see MOD Mariner 75hp/90hp Two strokes in for overhaul with upto 9000hrs on the hour meters!!. They get a make over an go back to work again.
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That's more like it, that is pretty impressive
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