check the float level in the carb too. if it's considerably high or low, when fuel sloshes forward under brakes it can either let too much in (if set too high) since it'll 'think' there's less in there as the float isn't pushed as hard upward if fuel is sloshing forward. Alternately, if it's too low, it can uncover a jet or emulsion hole or similar to the point it runs rough enough to stall (much easier to stall since throttle position is at idle and rpm is at its lowest.