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Old 02 March 2016, 08:11   #1
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Country: UK - England
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Engine Hours

Friend of mine is thinking about buying an 1999 75hp Mercury, ad suggests it has been very well maintained, however it has clocked up 975 hours would that put you all off viewing?
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Old 02 March 2016, 08:23   #2
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Do a thorough compression test .Get a simple boroscope down the plug holes would also give a good idea. While your at it what do the plugs look like? Have a look at the overall condition of the wiring etc. Gear box oil?? Take it for a spin and haggle. Its probably in better condition than one just sitting doing nothing!
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Old 02 March 2016, 09:18   #3
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Where are they geting the figure of 975hrs from?
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Old 02 March 2016, 09:38   #4
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I assume from a simple hours counter dial on the dash Steve, won't be computer read out as its an old school carb engine .... Don't know how accurate they are?
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Old 02 March 2016, 10:18   #5
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if you leave the ignition key on they keep counting up. i noticed that with my last boat (mariner 100 4 stroke) that whilst key was in it kept counting so you could literally have hundreds of hours that the engine has never seen, depending on how they left the ignition when out...OR they could have fitted the gauge at 500 hours and you are miles short, can't tell.

however, if it is clean and tidy and passes the usual checks then it wouldn't bother me.
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Old 02 March 2016, 10:32   #6
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Simply in ignition dubrus? Or in and turned on?
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Old 02 March 2016, 16:12   #7
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I've bought engines that were stuffed at 250hrs (Honda 90 4 stroke) due to poor maintenance and the fact the engine was used for short trips at high rpm. My mate who works as a mechanic to house boats has put 3000hrs on his less than 2 year old Yam 70f on his work punt and claims the engine to be like new still.

By the way some of the house boats had Honda engines which had done 9000 hrs without fault. Comercialy used engines which run every day for many hours will have a much longer life than the average angler who uses a boat once a week.


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Old 03 March 2016, 11:57   #8
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Quote:
Originally Posted by Budgie1 View Post
Simply in ignition dubrus? Or in and turned on?
I think he's talking about key in and turned on. Not necessarily motor running. Depends on the way the counter works - if it's simply counting the amount of time it has power or if it actually detects the motor running.

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Old 03 March 2016, 13:56   #9
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it depends on how they have been wired, the "proper" way is only when ignition is on but motor not running. i know my motor when i sold it has about 10% less hours than the counter showed due to this.
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Old 04 March 2016, 12:10   #10
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975 shared by 17 years =57.35294 hrs per year. I would check all of the above suggestions. The tickover will be crap, so never tuck the leg under, allways have it straight up and down. When ticking over.
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