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Doing a google search on cylinder barrels for motorcycles, all that's shown is either silver or black. VHT makes a cylinder paint, but like Henry Ford, any color as long as it's black![/quote]
Painting a barrel does not seem to last long from my experience, as the paint soon comes off even with VHT coats.
The best method I have found is very basically, a kind of stove enamelling, of the same heat resistant type you get on your white cookers; it has a specific name, Vitreous Enamel. Also available any colour under the rainbow!
HTH