This came up on my Facebook page from 6 years ago. 1200GS had dropped a valve. Needed a cylinder head, piston and barrel. All replaced with used parts. What is interesting is the bike was delivered to me from France, even with delivery cost it still worked out far cheaper than having it repaired over there. I wonder if that would be as easy doing the same today after brexit .... in case it’s confusing some people that’s a screwdriver in the picture pointing at the valve head embedded in the piston.