I'm guessing he meant .015" and .010" (0.38mm and 0.25mm)
That would make more sense. Still on the lower end of spec. Maybe last rebuild someone forgot to spec the end gaps. In saying that if it was built with tight tolerences and never seen many revs, kept a clean air filter, a quality oil, and never been drowned, it wouldn't be unheard of. The first set of rings I pulled out of my 300 at 75hrs came out with 0.4mm gap. The next one saw 85hrs and came out also only at 0.5mm and had seen much more throttle application. I'll be pulling the current 250 piston down soon and be interested to see how much wear they've had. Its at 100hrs now and has been ridden harder than I ever had any of the 300 top ends.
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