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Wots goin’ on here pls folks?

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Lobo:
Thanks gents - some useful thoughts.

Appreciate the comments Nigel, will do as you suggest, and yes, I can just buy the standard rings. Should I leave the liner scoring as-is, or risk making the bore out-of-round by dressing said scoring out?

Like the idea of sealing it up and applying a hose - thanks ka-ja. The block is designed like a bloody colander - but I’ll give that some thought today.

Sump M, yea, that’s my thinking, though eBay very thin on used parts. I’ll go as K2-K6 suggests and reuse the old piston, but with new rings.

Yep Ken; raw sea-water has been cooling this 10HP motor all it’s life. (tho hopefully followed up with a fresh-water flush after each use)

That chip is significant, but I’m hoping the head-gasket crushable component will ‘take the strain’ sealing against the liner.

Cheers all, appreciated,
Simon

Moorey:

 Were you using a TC-W3 marine oil as outboards run a lot cooler in the cylinders than bikes and it is designed for the cooler running engine. At 100 to 1 mix as used by a lot of Yam and Suzuki outboards it doesn't pay to use the wrong oil.

Lobo:
Thanks Moorey - tho’ the engine new to me and I’ve no idea of it’s history. From the localised blocked jacket cooling (exactly where the piston rings seized) and the fact that all else looks good internally (ie bearings / surfaces, piston skirts / crowns etc) I reckon the T2 oil delivery was likely not the issue.
I will however likely go 50:1 once I get it running...
Cheers.

K2-K6:
"Appreciate the comments Nigel, will do as you suggest, and yes, I can just buy the standard rings. Should I leave the liner scoring as-is, or risk making the bore out-of-round by dressing said scoring out?"

If you can clean off the baked carbon/burnt oil then leave the surface as is. It's of course nowhere near perfect, but with rings free and cooling working it should be better than first appearance appearance would suggest.

Moorey:

  The reason I asked about the type of oil which I notice you didn't actually answer is using non marine oil makes water cooled outboards
 prone to seizing on the top ring.

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