This first question you should ask yourself is this "Am I repairing or restoring?" The answer will make things clearer in your mind.
These are my two yardsticks, generally speaking.
If it's been found in a ditch & most of the paint has been removed by abrasion, sun and rusting, then to repaint it is just part of the restoration process. There is no "character" left to preserve.
If it has most of the original paint & just needs a good clean, then do just that & when dry, rub it all over with an oily rag. Repairs & new bits only add to the character of the device.
I am by no means consistent though & sometimes have a different approach. I like bare satin finished aluminium and the ST flat twin is a case in point. When I got it, it was devoid of paint & the chromate etching primer had eaten into the surface.
formatting link
I decided that I'd prepare it as a show engine, removed the barrels and heads to look inside & finding all well, gloss blacked them. Using a number of soft brass bristle brushes in a high speed drill, I then stripped off the chromate primer, washed the engine down with meths & lacquered the ali castings. I found traces of green paint inside the fan cover end caps and carefully preserved this for some future restorer to discover.
It came to me without a mag, but I had just restored a circa 1920 EIC magneto, complete with fabric covered HT leads. I also had a new matched pair of mica insulated sparking plugs and one of those brass cylindrical tanks from (I think) a mower. I chose these as they fitted the appearance of the engine. In doing so, I temporarily emphasise the "early vintage" look of the thing. Nothing irreversible. Here it is finished & mounted on a nice
100 year old rosewood stationery box I found for free in the club tent .
formatting link
My mindset is that we only have these Iron Toys for a while & it is up to us to at the least look after them, any restoration should be minimalist in nature & follow the maker's scheme of painting if possible. If, like me, you don't want to do the latter, then leave a witness for the bloke in our future who will be following you down this rocky road in perhaps 100 years time. Think doctor - and Do No Harm.
Make no mistake, for the great majority of the engines & driven devices that fall within our perview, once they are cleaned up & cared for, they will never be broken up for scrap now they are all beginning to appreciate. Only giant machines that few can store or manage are in real danger & for that we have Internal Fire and The Anson - and bloody good job too!
Regards,
Kim Siddorn,