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Well, so far everything about trials is different to regular bikes. It seems like there is some magic going on inside, small demons and trolls and such like.
I am tempted to run the bike for an hour with the air screw turned out some more, to at least 3/4 out instead of the 5/8 it is currently (or maybe it’s closer to 11/16). So long as it’s no more than a full turn, I’m not looking at a different jet.
Not sure a chocolate brown is even possible with the setup, but I also believe the jets in the carb aren’t standard. I think that they are a size larger than spec, which could be contributing to the soot.
At least today the plug’s electrode was dry and black, and there was much less wet area on the periphery. Last week it was, well, you see it on my hand.
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pdlouche
The plug does look a bit wet. You'll get there with the tuning, I know I'm not going to have a better idea than you what's going on with it. I've never had a 2 stroke with plugs like that though. Plenty of black sticky stuff in the exhaust ports and exhaust but plugs looking a bit browner and drier. Hard to tell if it's a lot of low revs and low speed stuff whether that would make a big difference.