My Sunbeam Model 10 has a (teeny weeny) Amal Type 4 carb - the sort with radial holes around the bottom of the mixing chamber. I have no experience with this model and am struggling a bit to understand the idle circuit.
There is no idle jet. There is an air screw, opposite which there is a small drilling (1mm or so - not measured) communicating with the air screw passage. There is another drilling coming vertically up from the base of the carb also communicating with that passage.
Above the latter drilling and in line with it is what I presume to be the idle air feed into the carb bore.
Am I correct in believing that the idle air supply is coming from these 2 external drillings?
