I've only experienced the problem once, when it was very cold.
I took the grip of a screwdriver, knocked the floater case a little, then it started immediately.
3 possibilitys,
condensed water from air, fuel etc.
-inlet valve freezez, knock with screwdriver grip!
-jet hole freezez, open throttle and rev it!
-water in floater case making fuel level unreliable, bleed carb!
I guess its a british problem as air is cold and humid over there these days.
Maybe an occcasional 0,5% mix of full synthethic 4 stroke oil in fuel would cure, its also good for plenty of other reasons when humid, as avoiding tank rust etc.
Matt
[This message has been edited by Matt595 (edited 26 February 2005).]
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