[quote]ORIGINAL: dogshome
My 180 is a lot better with a carb that has an accelerator pump. I couldn't tune it for best-idle/best-pickup on three other Walbros of various venturi sizes.
Accelerator pump made it pretty-much perfect.
According to the WT456-1 parts list, there is something called accelerator kit, piston. Item# 58, P/N 160-510. I wonder if this is an accelerator pump? Regardless, I don't think that's related to this quitting on decel. I plan on doing a decel experiement with the choke in various positions to try to get a clue. Need to know if it's lean or rich at that moment to narrow the possible causes. My money is on lean right now, as W8ye said.