Tommy Chaos
New User
Bought a carb kit from Steiner Tractor. (1939 B Allis) Cleaned everything up. put kit in, and engine will start and run normally above idle perfectly. Retarding throttle to idle will result in fuel starvation, (surging, backfiring) need to have about 1/3 choke to give it enough fuel to run smoothly at idle Tore down carb a second time to verify all jets, passages, float level, etc. are correct. All settings are by the book. Can close or open the idle air bleed needle valve with no change from the recommended 2 turns open (does not affect idle at all). It seems obvious idle fuel circuit is messed up and very lean mixture, but can't find a problem. Fresh clean fuel and filter. Mag, timing, plugs, wires are all good. Any suggestions?