Wow. Lotta damage for 45k miles.
At 40k I pulled mine apart to remedy a trans issue (popping out of 4th gear) and found about 5mm broken off the end of the front cylinder's compression ring. Chunk was still in the ring groove.
I was going to mention that the bore is Nikasil- not likely to change a whole lot. At 100K+ (broken shift drum) I was still seeing cross-hatching and a perfectly round bore. I'm still running the stock pistons, with new rings.
Comparing the piston top to others that doesn't look so bad. Air-cooled motors usually have a much more dramatic layer of carbon. I would say it's about what I've seen on mine the last time I pulled it apart.
Hard to see what's going on with the cases in the pic. Was it actually leaking there?
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