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WIth Shell v-power and your favourite 2-stroke oil, you could go 50:1 (that's from my dealer). I have been running 50:1 since my 2002 300 EXC has been new, always use new mix for every ride, and drain whatever leftover is in the tank every two weeks.
DON'T SLEEVE. It is almost as cost effective to have the cylinder welded and re nik-a-sil'ed. Sleeves don't have as good of cooling effect and rarely yield the same performance. not to mention you have to run an oddball piston and hone it.
re nik-a-sil and don't let the ring go too long next time and you'll have years of trouble free service.