Show repairing Repair ilg poor idling of motor car engine opening past the butterfly valve to allow the motor to idle at a slow kneed Is surprisingly saint after the car lias has been in use tor for sev ertil years the shaft on which the but is mounted und and its bearings become worn word the result Is that the tha butterfly never closes to the samei position twice running in addition a considerable amount of air leaks through around the shaft bearings A carburetor WORN AND 0 0 15 4 V all Z A with adjusting screw removed file a notch in the tha butterfly valve to gov ern the idling speed of the motor moton when the bearings admit admi tair air simple way to cure tilts this trouble Is to remove the adjusting screw entirely so that the butterfly but terlly closes tight file a small notch in tile the edge of the butterfly valve as shown the notch should be filed in the side of the butterfly valve on which the low speed nozzle Is loc located and the size of the notch will govern the idling speed popular science monthly |