You'd better check it...Newer AMAL Concentrics have the removable pilot jet reinstated...I'm not sure about the Wassell version...
If it has the removable jet follow the settings for an Amal monobloc from 1954 onwards...Ian
Ian, the new Wassel concentric-copies have the pilot jet fitted from the outside opposite side of the air adjust screw. Easily accessible and replaceable.
Quite a different story from the first year concentric with the pilot jet fitted from underneath the housing, inside the float bowl. Later of course they replaced the jet with a bush, but kept the threads. Some confusion before I realized I hade no pilot jets, it ran a tad on the rich side with just open holes right through...
But that’s the Bonneville, the M21 have a brand new Wassel. Runs good but still some sorting out.