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Engine cases

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kettle738:

--- Quote ---How can that be, the top and the bottom wouldn't match?
--- End quote ---

The top and bottom don't match, it's common to other Hondas......CB450 being the first that springs to mind. [ Guests cannot view attachments ]


If the attachment works......this is a 600m from new engine that had been stored since 1978, it shows quite clearly where they applied paint [ Guests cannot view attachments ]

Mick.

Nurse Julie:
Yes Mick, I can see the difference in colour now. So on the 2nd pic, the 400/4, what's that pickling on the bottom crank case, is it a lacquer?. It must have something on it, as after all those years I would have expected it to be all oxidised if it were bare alloy.

kettle738:

Don't flame me if I'm wrong but I believe that is just traces of crankcase sealant that have become far more obvious with age as they have discoloured...they would probably wipe off with a bit of acetone...

The engine was stored inside a centrally heated house hence the lack of corrosion.....the downside is it had a thick layer of grime, dust and carpet fluff etc that had got everywhere.....when I blew it off with an air line inside my garage I instantly regretted it.

The engine on my own 4,100m from new 400f is identical.....it's a shame they didn't finish the cylinders and head because they tend to look pretty grotty with no obvious way of improving that doesn't involve paint or dismantling....no idea why they didn't as the entire top end of plenty of other Hondas were painted with no problems.

Mick.

Dave487:
It must be a Japanese thing because the Yamaha TZR250 that I restored last didn't have the bottom painted even though the top crankcase and barrels were painted black.
If Trigger paints and lacquers them all over then I think I'll do the same as I doubt that all the corrosion can be polished out.
This is after repairing all the stripped threads and broken bolts etc. caused by a PO. I think their tool kit just consisted of a stone axe.

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