I had my barrels powder coated a long time ago. A very expensive mistake.
Engine overheated running in and partially seized.
Not only was there the cost of another rebore but getting the powder off was extremely difficult.
The stuff was applied really thick. I think because its applied electrostatically it builds at the fin tips and doesn't penetrate to the root very well.

IMHO its a completely inappropriate finish for air cooled barrels.

PJ1 fast black out of a can is really good and can, with some careful masking, be blown over on the bike if it starts to look a bit tatty.

There is a 2 page thread at BritBike about powdercoating cylinders and a lot of people seem to have good luck with it.

http://www.britbike.com/forums/ubbthrea ... 403&page=1

However, I think I will paint mine since if it is trouble, it is a PITA to get off, haven't decided on the color yet, I know the orig was silver.

Dave
69S

I think a barrel would be easier to maintain if it were just painted.

I know a local guy who built a hotrod T140 with a big bore kit. I don't know where he got his barrel from, but it is a nicely finished alloy overbore with liners. The company said painting it would void any warranty - the paint reduces the thermal efficiency of the fins on their barrel.