I was thinking what could be the difference between a gasgas carb and any other brand 2 stroke carb, then I read about receiving dirty carbs.. When I sent my kdx parts to him in 2013 i made sure these were spotless lol. The work he does is fantastic
also check the yellow wire by the top shock mount on the left side if sitting on the bike, I remember it becoming exposed at one point and I covered it with electrical tape but that may have fallen off now causing a short?
the 200 barrel is the same size if i remember correctly, the difference is made up in the head as the dome protrudes down into the cylinder to make up for the shorter stroke
I'm a previous owner of that bike, the people I sold it to may have told you some lies, the bike does not have a head mod, the squish is 1.6mm currently with a .30 base gasket