Well I couldnt wait any longer. After rebuilding my XL600RMG from the ground up I took it around the block half a dozen times today to get it hot and check for oil leaks. Front brake yet to be fitted and back brake shoes still bedding in, but, holy shit, how hard does this thing go???!!!
Running 0.5mm oversize 11:1 Wiseco piston, Kibblewhite valves, guides and springs, and a Staintune muffler from a VTR1000. Goes much, much better than before the rebuild. Clutchless wheelies in first and second gear. I was wondering if any other XL600 owners here are running the 11:1 Wiseco piston and if you've found it made a huge difference to the power the engine produces.