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I have a replacement cylinder on my engine, this is painted black and obviously stands out from the rest of the natural coloured motor.

When (what years) did they start painting engines?

I had given some thought to removing the black but this will seem a bit too much work to get into all the fins so I'll probably just match the other side with black VHT paint unlesss someone can suggest a better option. ( I have considered silver/aluminium coloured VHT paint too but doubt it will match)

I think I'll keep the cases their standard metal colour.

. . could you not have it bead blasted??

It worked fine when I took it out of the bike and I dont want to disassemble it when I dont have the tools or experience to rebuild it.

You could have it soda blasted in situ.

There's nowhere near me that can do any of the blasting processes other than the roughest shotblast work, the engine has sat untouched for ages because I've been unable to find a neat solution for this hence the query about painting it.

Hmm, I'd see that as a good excuse to get the experience of taking the head and barrel off and get the barrel vapour blasted. It's a pushrod engine, so should be nice and simple (says Mark who's never dismantled a 4-stroke before...)

MarkB wrote:Hmm, I'd see that as a good excuse to get the experience of taking the head and barrel off )

yes, it really is a simple as is sounds. These are lovely engines to work on.