Austin Classics

Fitted to the Austin 10/4 from introduction in 1932 until November 1933.

B. Plug Fixing Petrol Pipe (Banjo) with gauze. O. Slow-running regulator. S. Stop screw controlling quality of mixture. T. Petrol pipe union. X. Adjusting screw. Y. Stud.

The stop screw (S) is the adjustment for the idling speed; turning the screw clockwise increases the speed. The adjustment controls the idling speed when the control knob (choke) is fully released. Should it be found that the two speeds obtainable by partly withdrawing the choke control to the two intermediate positions already described-are unsatisfactory, turn screw (X). Turning this screw clockwise increases the intermediate idling speed and vice versa. Screw (0) is the air regula ting screw and controls the proportion of air in the slow running mixture. Screwing this adjustment in or clockwise enriches the mixture but it should not be necessary for the screw to be right home; usually within about three turns from the closed position will be correct.

To remove the float chamber and jets remove the single square head screw (Y) after which the float chamber can be detached. The main and compensating jets are the smaller and larger respectively. The pilot or slow-running jet is at the side of the float chamber facing vertically upwards. It can be removed by unscrewing it out of the body. Occasionally inspect the choke control cable as over time, this may stretch and fail to close the choke fully. Adjust it so that when the knob is pulled out to its fullest extent the choke is fully closed. Do not overdo this adjustment, however, or it may not be completely open when the knob is released and in this case petrol consumption will be affected.

I have very little data on this model at this time, but would appreciate it if anyone who has any information, photos or data sheets on this model would like to share any relevant information.