It is all a question of what you are trying to achieve, Mark. I've thrown away Honda engine parts that were well within maintenance standards, because I'd rather have near-new ones, and for a modest cost compared with new ones, you can probably buy a bucket of parts somewhere. People seem strangely prone to taking engines to pieces, losing or destroying a few parts in the process, having no idea what to do next, and shovelling the mess into a bucket and selling it. Of course they will probably claim it's a complete engine, which it won't be, but it may be an excellent resource for parts in good condition - and you can look at the parts before you buy the bucketful. On the other hand I had another very worn Honda - within service limits - that I just re-ringed and put back together and found it had a big-end knock at idle. By my standards the whole thing was worn out, so I just kept all the bolt-on bits (especially air cleaner, starter, carburetor, and ignition module of course, but also all the fasteners, most of which seem to be missing from bucket engines) and scrapped the rest. Since that experience I no longer re-use a block with more than about 0.0025" bore wear, or a crankshaft with more than 0.0005" of crankpin wear. This leads to nice quiet Hondas that I enjoy using - and I think other people would enjoy them too.
