I am still at my wits end to figure this out. After an engine rebuild there was a big hole/ hiccup in initial acceleration - the rest of the range fine. The idling was surging and stalling.
Removed carb, dismantled and cleaned (It didn't really need it!).
Put back on engine - just the same.
I checked the slow run solenoid jet which does work. The carb ran perfectly before the engine rebuild . . .