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Old 10 July 2011, 17:38   #1
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Question about engine hours

Evening guy's. I was wondering how many engine hour you could expect from a yamaha 250 which has been used on salt water and has never been flushed through? I'm looking to upgrade my current ribeye to a ribcraft and have found an ex charter ribcraft which looks to be in good order but has around 1000 hours on the clock. Obviously the fact that they dont flush them through is ringing alarm bells tbh. I though flushing through was common practise? Does it matter if its not flushed if its being used more regularly? I'm competant enought to know that high hours in a short space of time isn't always a bad thing, better to be used than just sat.
I have been looking at a new boat but the vat just kills it for me, so this is the next best thing just don't want to have to spend more money on re-powering if i should go ahead and buy the thing. Any advice would be appreciated
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Old 10 July 2011, 17:43   #2
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I'll start it off by saying I'd think it more important to flush with high hours as the more salt it's had through it's waterways. If it's been kept on a Marina berth you can understand why it may not have been done. If it's been recovered after each use then that's just lazy!!! Basic maintenance so what else has been left out ?

High hours but if the price is right and it's running right with history there's plenty of life left in it.

On the other hand the local dry stack don't flush the boats after each recovery so it's possible.
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Old 10 July 2011, 18:00   #3
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1000 hours is a large part of the expected lifespan of an outboard engine and well into major overhaul territory. Start running....
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Old 10 July 2011, 18:14   #4
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Originally Posted by willk
1000 hours is a large part of the expected lifespan of an outboard engine and well into major overhaul territory. Start running....
Hence th price needing to be right!!

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Old 10 July 2011, 18:33   #5
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1000 hours is a large part of the expected lifespan of an outboard engine and well into major overhaul territory.

Which engine repair company told you dat?
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Old 10 July 2011, 19:01   #6
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Evening guy's. I was wondering how many engine hour you could expect from a yamaha 250 which has been used on salt water and has never been flushed through?
Not flushing an outboard may result in less efficient cooling. That is probably not going to be the killer on that engine unless the cooling is really significantly impaired. With 1000 hours on the clock its the other bits (metal rubbing on metal) that could be expensive to fix.

Quote:
I'm looking to upgrade my current ribeye to a ribcraft and have found an ex charter ribcraft which looks to be in good order but has around 1000 hours on the clock. Obviously the fact that they dont flush them through is ringing alarm bells tbh. I though flushing through was common practise?
its not easy to do if the boat lives afloat - especially on a mooring. Presumably they have told you this which means they don't see it as a problem. I'd certainly rather have an engine which was used daily and never flushed than one which was used only once a month and never flushed (in the former the salt probably never really gets a chance to dry out/solidify (esp. if kept afloat) whereas in the latter its slowly crystallising to hard impenetrable crystals).

Quote:
I have been looking at a new boat but the vat just kills it for me, so this is the next best thing just don't want to have to spend more money on re-powering if i should go ahead and buy the thing. Any advice would be appreciated
Big jump from looking at a "new boat" and one which has an engine with 1000 hours on it...

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Originally Posted by Boats&Outboards View Post
I'll start it off by saying I'd think it more important to flush with high hours as the more salt it's had through it's waterways.
you think? whilst the salt is moving its not really causing a problem. its the salt sitting doing nothing that is the issue - i'd go with the opposite.
Quote:
Basic maintenance so what else has been left out ?
well if its been serviced as per yamaha's recommendations every 100 hours its potentially had a lot more TLC in its short life than a "private" user who ignores it except for once a year...

Do yamaha even say it should be flushed daily - IIRC my manual only mentions it in the storage for >2months section (although I do it every trip as never sure when going back in)? It does suggest a 15 minute flush though - which I doubt all charter skippers would bother with when keen to get the boat back and get some rest/beer at the end of the day.

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1000 hours is a large part of the expected lifespan of an outboard engine and well into major overhaul territory. Start running....
although if it has had its full 1000 hrs service (including timing belt replacement and various other special parts) then it might be a better option than say a 4.5 yr old motor with half the hours which is going to need that very expensive service at the start of next season. If you are planning to put lots of hours on it a 1000 hr engine its not a good place to start - but if you are a typical leisure user doing 50-100 hrs a season then is there much difference? are those 100 hrs going to be where it fails?

That said - I wouldn't buy a 1000 hr outboard unless I could afford a back up plan if it needed replacing...
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Old 11 July 2011, 03:42   #7
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My point being that if it's had high usage I'd want to ensure that it's services and maintenance has been kept up rather than left.

The OP does not say that it's done 1000 hours on charter or that it's been serviced every 100 hours as per Yamaha requirements, just that it's ex charter so it could be that it's had 500 hours on charter with good upkeep then 500 private with not so good upkeep hence my points. Maybe a printout would help as if it's 1000 hours at 1/2 power that's not so bad. 1000 hours on or near WOT might be different

If it's being bought directly off the charter and with good history AND at a very cheap price I'd go for it. If not I'd keep looking

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Old 11 July 2011, 06:04   #8
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I'll leave you yam experts to discuss the servicing, but having seen some Suzis which were ex fising boat and never seen a flush hose in their lives the water passages were as spotless as they were going to get.

Bottom line is that if there is a constant flow of water, the salt can never solidify. If there is a spot hot enough to evaporate the water & crystallise the salt while it's running I'd say you have bigger problems than flush.

Remmeber flushing is all well & good, but unless the engine gets hot enough to open the thermostat, half the system will never have seen fresh water anyway......

So yeah, depends on the price......
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Old 11 July 2011, 06:35   #9
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Hi guys
You lot seem to be forgetting one pretty important factor concerning stagnant salt water... It makes for a fantastic electrolyte!...
I flush my outboard through each and every time not because I'm concerned with salt deposits ( as generally the deposits will wash off the next time the engine is fired up) but I know that two dissimilar metals left in salt water will immediately result in galvanic corrosion. This is far more damaging than any deposits left behind. I would expect most of the water to drain from the outboard but is it worth taking the chance that isolated pockets of warm salt water are left behind? ( especially if the outboard is left tilted back) Due to fresh water having a much lower particulate content ( negligible chloride particles ) then it's is much harder for a electrical circuit to be made thus minimal current generated between the two different types of metal.
As mentioned already, I would much rather have a high hour engine that is used frequently (and hopefully serviced accordingly) even if it was not flushed after each use than an outboard that gets used occasionally and then left for extended periods of time without being flushed.

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Old 11 July 2011, 08:52   #10
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Quote:
Originally Posted by 9D280 View Post
I'll leave you yam experts to discuss the servicing, but having seen some Suzis which were ex fising boat and never seen a flush hose in their lives the water passages were as spotless as they were going to get.

Bottom line is that if there is a constant flow of water, the salt can never solidify. If there is a spot hot enough to evaporate the water & crystallise the salt while it's running I'd say you have bigger problems than flush.

Remmeber flushing is all well & good, but unless the engine gets hot enough to open the thermostat, half the system will never have seen fresh water anyway......

So yeah, depends on the price......
I have a Yamaha 20 that I inherited from a friend that lived on the water and used it daily for a year or two. Never been flushed before me. I have had it for a couple of years now using it infrequently but never had a problem. But the price was right - free.
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