I had starting problems once.
I turned the bike upside-down, and when I put it back to the right way up it wouldn't start, so I left it for half an hour and it still wouldn't start. Eventually throttle full-open it started.
Must've been fuel issues, but seems like strange behaviour to me.
J
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-