thanks for responding . ive looked at plugs like you said nothing different as far as color . carbs dont spit and no backfire . as long as i let it wind up it will rev to the ski . im not much of an expert on carbs but i suspect maybe the secondaries are not openning !? unfortunately in this great corrupt and broke state of illinois its 11 degrees out and theres no driving the truck right now. p.s. i balance the carbs using a pair of calibrated vacuum gauges one to each carb and all other ports plugged off carbs pull equal vacuum at all rpms
