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Old 21 November 2002, 15:08   #11
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Country: UK - Scotland
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Dave

Next time you are in trouble, fill the boat with water and await rescue.

Keith (sorry Alan P ) Hart
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Old 21 November 2002, 15:24   #12
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Country: UK - Wales
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Hi All

I run a merc 90f on a Avon Adventure 5.6m. Had a few problems -

Fixtures broke on engine lid. Fixed under warranty

Engine missing on a cold start. Fixed under warranty

All in all good powerfull engine on the Avon and having driven wavlengths Humber "dito".

Would prefer yam f100
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Old 21 November 2002, 17:50   #13
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Had to put shedloads of fairy liquid in with the water to shift the oil keith! Left a trail of bubbles out thru the drainer first trip afterwards Pity I couldn't get the b****r in the dishwasher!
Seriously though that was one catastrophic machinery failure I could have done without but I suppose there is always one rogue one no matter what the product, I just wish I could avoid buying 'em - but the replacements have been no trouble whatsoever in any way at all - turn the key, starts first crack and it never misses a beat - now a statement like that is surely courting trouble
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Old 22 November 2002, 05:32   #14
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As I am sure u all know. An engines quality mainly shows up in the first 100 hours or so. Same with car. If you get to 100 hours with no problems then the chances are that with regular servicing and care the engine will run for ever. Any of the manufacturers have bad eggs unfortunate to get one but never the less possible. If the merc has been running fine for a year then with good servicing you should have very few problems.
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Old 22 November 2002, 07:02   #15
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DGPW, - If I have read your profile correctly, that is sound advice coming from someone with responsibility for 40 4- stroke outboards - this seems a staggering number, or should I read rather one 40hp 4 stroke outboard?
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Old 22 November 2002, 10:32   #16
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That would be several 40 4 strokes not 40 of them infact prob only 4 or 5 I will change it
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Old 24 June 2008, 06:38   #17
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Follow up 5 years later !!

I have just re-read this thread which I initiated back in 2002 - my Ribcraft 5.85 / Mercury f90 combo has given the family 5 seasons of wonderful rib-bing, in the Solent, to the beach and back, wakeboarding etc. and has now moved to Cornwall. Sadly, the engine has now been declared scrap owing to corrosion in the power head, possibly attributable to a metal gasket between the Mercury leg and the Yamaha - sourced powerhead. Metal between the oil and water channels is now below 1/16 in. - anyone else had this problem with this motor? (it is a 2000 model - dead after 7 seasons, in spite of regular flushing out with fresh etc.....
Looks as if I shall have to buy the Yam f100 I originally dreamed of, after all - anyone know of any 'cheap' ones out there?
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Old 08 July 2008, 06:34   #18
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similarly we still have our merc 90/ocean pro set up. we have had and still have other boats of course but kept this one as the kids considered it their own, except when it needs work doing on it of course! Doesnt get much use these days as they are working away but has develeoped a misfire now and it seems it is down to one of the triggers which come new as a package with the stator and are ******* expensive. Failing that it is the CDI unit. So the question is has anyone got said parts from an otherwise dead engine ? Are parts available from yours Benjamin?? or does anyone know of someone breaking one of these for bits?
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Old 08 July 2008, 12:48   #19
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We had a Mercury F90 on a 5m Humber Destroyer. After 3 years busy use as a club rescue and training boat (not sure of total hours but probably circa 500 and regularly serviced) it developed an oil leak at the head/leg joint. On stripdown, it was discovered that the internal corrosion was severe, indeed, there were holes in the crankcase and the engine was considered to be beyond economical repair. After a review of our routine we determined that daily flushing was typically less than 2 minutes and allied to the increaed salinity of the Eastern Mediterranean was insufficient to remove the salt. Since increasing the flushing time to 5 minutes we have had no problems with the replacement and another engine (Suzukis). Am still unsure as to whether corosion was the sole cause of the engine failure though!!!
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Old 13 July 2008, 14:37   #20
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oh bliss. it wasn't the expensive CDI unit or the even more expensive triggers and stator assembly - it was the interupter switch setting on the gear linkage. The switch drops the engine down to 2 cylinders from 4 when moving out of neutral to lessen the shock load on the gearbox. Only mine was forgetting to put it back to 4 cylinders again! Bit of adjustment, and a tune up at the same time, and its running fine in fact better than it has for a long long time! Which is a bold statement I hope I don't come to regret.
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