I checked the carbs carefully most recently in august/september when I was trying to trace my fuel loss and I tried a different set of carbs. The valves are good as well as the needles, but I've not messed with them lately. They have both been disassembled and thoroughly cleaned.
I think the extremely intermittent and temperature/vehicle incline-related nature of this problem suggests a supply problem of some sort - although I have no way to assess it - other than swapping my fuel pump and maybe trying yet another fuel tank...
Right now it is too dang cold to mess with the fuel...
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