I have a Villiers rotavator with an S12 carburetor, but it is missing the air screw (screw with spring just behind the air filter
the manual shows it as a screw with a normal flat end, but I suspect it should be pointed? If anyone could give me dimensions or a picture I could make one, but cannot find this information on the net.
Thanks Wheelyjon
Here’s a drawing and parts list for the S12, on our machines they were only used on Howard Bantams with Mk15 engines but small motorcycles had them as well. https://www.villiers.info/carbs.php