First was to get the carbs out and revert from 130/126 to 135/120, which is the stock setup for the XT600-model my carbs are actually off, but I only found that out later in the evening after going though some workshop manuals.
Followed by slowly increasing the number of holes in the airbox-lid to increase the amount of air going into the engine. (Remember it was running more than fine with this setup when it was just a 500cc engine!)
And then I finally found the correct choke knob in my "stash of valuable unused parts", i.e. the left-over parts bin. This one's from a TM38-86 and is about 6mm longer than the VM29/47 choke knob below. In order to make it work on the XT600 carb, the o-ring has to be removed.
Result? Starts first kick and pulls like a horse. The combination of more air and richer jetting definitely has released some ponies inside the engine and I have the nagging suspicion that the fuel consumption will go down, because I am not 100-percent sure anymore that the old cable-operated choke sealed all that well.
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