Iwas experimenting yest, [ on dt400], when it got hot, [ 400f on tour tech ] it started to surge & pink, stopped, screwed air screw in 1/2 a turn, . it ran 10degree cooler.[ 387 the hottest, all day, ] and was smooth on over-run,
another experiment, on a steep downhill, [ twistys,] I shoved on the choke, / it was like an engine brake , smooth, and the temp dropped 50degree in 2 minutes , so air is the killer of 2strokes ,