Okay the more reading I'm doing on this, the more it seems to point to a lean running condition.
Which would make sense, as I melted the top end down last winter doing a bunch of wide open runs across the hay field.
Sled is oil injected (seems to be working, at least at an idle as it's a smoke show when started and idling).
Water pump and coolant is good (mechanical gauge tapped into cooling rail by heads, doesn't seem to get much hotter than 130 degrees running in powder). Seen it get higher on hardpack but not much.
So where do I start ?? Main or pilot jets ?? Carb boots leaking ?? How can I test this ?? Maybe spray ether around the carbs and see if the sled revs up while idling ??
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