When you ran it in the morning I assume the choke was off. Would you say that the bike felt flat and lacked power, and that throttle response improved greatly after semi engaging the choke? If so, which is how it reads coupled with a grey plug, you are leaaaan.
The main strikes me as being super lean for the elevations and temps you have stated. I'd be thinking 180 minimum.
You also have a lean slide, with a 42 pilot in a 250.
Without any knowledge of the older engines or experience jetting one I'd be looking in the DB section for someone similar. I'd be looking at starting with fresh fuel mixed at a known ratio. The needle in clip #4 and a 180-185 main. I'd then go about establishing the idle circuit ala pilot jet before moving onto the clip position, and then the main.
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