i cant find a source to find any walbro carburators,any help would be great.my kids have these gas scooters with 43cc motors with walbro primer bulb carbs that have single mixture needles that are terrible.i dont wish to use the carbs of my 40 -50 cc motors for this.walbro site doesnt list any carbs that are use on our rc gas motors.thanx in advanced for those that can help.