The cylinder head was full of burnt oil. The perfect tool to remove this is a sharpened nylon stick. Soft enough to not leave a scratch, and hard enough to chip the cole from the metal. The result is a good surface to polish. I left the old valves in to protect the valve seats. The company www.Kedo.de is shipping new valves, seals, guides and a new Wiseco high comp piston for the engine. There is no obvious reason for the lost of compression. Just the result of leaking oil into the cylinder. I will take no risk - both top, sleeve and piston will be reworked. The lokal Yamaha supplier Eliasson Racing will do the bore of the cylinder sleeve.
The original surface of the top.
