I opened the head of my WR this winter to check the valves ... I put some contact kleen (contact cleaner from Kleen Flow) over the valves to see if they were sealing right (learnt that trick in Dirt Rider Nov 04) . Nothing goes through. Now I suppose I don't need to unmount the valves do I? I suppose I only have to check if the space between the cam and each valve cap is OK. Anything else I can check easily before I close it up this week end? Also, I remarked that the admission valves are black (3) while the exhaust ones (2) are kind of brown/ orange... why that for? Thank you.