Curvy engine.

I was thinking more of a donor. Strip the pointy guts and replace the buggered curvy parts.

[squirrel_hunter]

I wouldn't do that. If you have a working engine I'd transplant that rather than stripping 2 down to make 1 good engine. Its not a 5 minute job and you will need to spend more money on gaskets and so on depending on how far down you need to go.

What's the issue with the current lump? I would recommend finding that out first.

As mentioned, oil starvation leading to a dropped valve. The extent of the damage is as yet unconfirmed. Haven't had the courage yet.

If it's a dropped valve, and you know which cylinder, i'd fix that rather than look at a new lump. in the long run it's less work to perhaps drop a known good cylinder head on the engine, than to replace the engine, or rebuild a knackered one. Worst case there, assuming bottom end is good, is a new head + piston. Conrods generally don't get bent these days from experience, if there's that much damage you've usually got a rod through the side of the block. Check crank play, and for play in small ends.
Gotta be easier than all the arsing round finding a new engine, then transplanting it in.

[squirrel_hunter]

If its the valve you might get away with just a top end. I don't think I have those spares left anymore otherwise you'll be welcome to them. Will have a look in the morning anyway.

I would drop the oil and then check the oil gallery plug as well. Any copper looking flakes and its your big end and a new engine. In my experience that is.

[andrewsmith]

I would take SH's word on that, as he's got enough experience on curvy motors

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Originally Posted by Matt-EUC

I was thinking more of a donor. Strip the pointy guts and replace the buggered curvy parts.

dont think its ever worth doing mayor surgery to engines these days,unless its a easy fix,with good engines for most bikes these days working out less then a full gasket set and a few bits and bobs,if by oil starvation you mean low on oil in the sump,then the big ends will be shot,but then again ive never heard of a valve dropping due to lack of oil,there is normally another reason it dropped,broken valve spring or collet coming adrift or even a broken or bent valve stem

[squirrel_hunter]

I've checked and I don't have any top end spares left, sorry.

[andrewsmith]

PM electro
I think he's still got a full motor with a totalled bottom end

I've spoken to some friends and Rictus and they've said that the crank is probably shagged too.