The Amal carb on Scotts is set at 38degrees which is probably steeper than any other application that I can think of, and the simple answer is that the petrol level in a “tickled” float chamber is higher than the level of the primary airway, so it runs out of there until the engine starts and then stops when the fuel level drops down to its normal running level. It,s as simple as that and normal behaviour!! Good Scotting.
