I believe this is for rigid competition because it is narrower than standard it is 3 and 1/8. The pipes are a bit crudely bent. There is no rust inside.
AJS MODEL 16 16C 16CS 18 18C 18S 1950 PARTS BOOK MANUAL - AJP06
AJS Motorcycle Manual 1953 Model 16 18 Professional Reprint Book Large Format
AJS Single twin Model 16 18 20 31 Parts Book 1959 Original Illustrated List
4x Ewarts Petrol Tap Corks for AJS Ariel BSA Matchless Norton Triumph Villiers
10x Ewarts Petrol Tap Corks for AJS Ariel BSA Matchless Norton Triumph Villiers
2 x Ewarts Petrol Tap Corks - AJS Ariel BSA Matchless Norton Triumph Villiers
