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V interesting post, but did you ever get this finally sorted out? I am having similar ...frustrating...issues with my M600. It is definitely carbs and I am getting the same sort of symptoms. But, mine is definitely running too rich, both plugs are black. I get the same sort of hesitation picking up from low speed 3000 rpm ish, which would seem to me to be the transition point from pilot to needle/slide.
As you did, I have stripped the carbs, new float kits to stop the flooding on one side, seal kits etc etc etc. All seems in decent shape. I have dynojet needles but std mikuni jets.
Needles in 4th from top slot. Air screws 2 1/2 turns out as per Dynojet instructions.
I'm not doing anything until I get it through an mot and can try it on the open road. It did get to the Mot station and back (in disgrace) yesterday and ran OK apart from the hesitation/ fluffing as mentioned. A few things to sort before re test, so will get them done.
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