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Old 17 March 2013, 18:57   #11
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I'd price the repair up before you commit to anything-it may be cheaper to flog it as spares and buy another motor.
Good thinking

Anyone know anywhere that rebores?
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Old 18 March 2013, 03:26   #12
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Check out if it's a chromed or nikasiled bore as well. If it is, it'll need redoing.
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Old 21 March 2013, 06:22   #13
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If it's a 2- stroke you might have a too advanced spark as well....... (Don't ask how I know that destroys pistons! )

That looks prety bad. I would guess you are looking at replacement pistons there, unless that is a trick of the light. Unless you can get away with a couple of thou' skim you are probably looking at at least a 0.015" - probably 0.30" bore & replacement pistons. Replacing just the rings at anything above about a couple of tho' will result in a rattly piston and a apid route to it's next self destruction. Looking at those photos I'm not thininking "polish" will work in those bores. Any pics of the Cyls?


I found the same thing as the result of a too advanced spark. The one good thing about this kind of disaster is that when you rebuild it you have a known engine of zero running hours, and you know all gaskets are new, all seals etc have been replaced......


Google "Mallory" & "Sierra" - they do replacement pistons for pretty much any outboard. Mine now carries Mallory.
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Old 21 March 2013, 08:36   #14
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Quote:
Originally Posted by lockieboi View Post

Good thinking

Anyone know anywhere that rebores?
Coventry boring well experienced in out bored machine work
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Old 21 March 2013, 08:36   #15
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Identical to my 115 mariner that went into Pennine Marine as a runner until the afternoon they messed about with the timing !! Still trying to work out if they didn't premix the fuel or advanced the spark to destruction. On the Monday it had decent compression on Thursday it was a 470 bill & a box of bits ( that live in one of my sheds).
One of the pistons also clipped a port........
Good luck with the rebuild, when I looked at the cost it seemed prohibitive ?
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Old 21 March 2013, 08:38   #16
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One of the pistons also clipped a port........
Exhaust port? If so sounds like a way to advanced spark to me...

Quote:
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Good luck with the rebuild, when I looked at the cost it seemed prohibitive ?
I guess it depends on the borer / where you buy the bits. I reckon it cost me just shy of 800 to rebuild mine, (not including the PT upgrade) by the tme I had bought a full set of pistons, rebored the head (Blind bore on the clamshell so a little more expensive) and replaced all the gaskets / oil seals etc.

My reckoning went thus: I spend 800 rebuilding an enngine that's worth about 700. For that money I could go& buy a "runner" only to find it goes terminal very quickly, and have to spend another 700 odd....... By rebuilding I know it's full history - or at least the bit of it that counts when it comes to getting back.


If you look at it purely as insurance values, you'd never rebuild an aeging outboard.
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Old 21 March 2013, 08:43   #17
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Coventry boring well experienced in out bored machine work
Best source for cheap paterned parts

http://www.tmp-murcury-mariner.co.uk...ine.html#rings


Personally prefer genuine in my own builds but some times needs must
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Old 21 March 2013, 12:56   #18
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I wouldn't rule out me rebuilding this one if I ever get around to rebuiding the Honda quad & Honda trike in my sheds oh & my BMW R80RT oh & my two ride on mowers etc etc.
Cheaper & quicker for me to buy a complete engine from Clyde Outboards on here delivered & fit it to the transom.
I'll probably in the market for a decent Yamaha in a couple of years to see me out..........
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