Going lean when shifting...

yellow rose said

What is happening is you are pushing the throttle so slight that you get no pump shot, or it is just barely dribbling so it goes a touch lean until the booster catches up. I suspect you could fix this with a very small diameter squirter, but that may induce a huge stumble when mashing the throttle.

You will end up in a rubber room sucking your toes if you live and die by the A/F meter. The lean spike is so short, for a short duration with very little load it is incosequential.

Click to expand...

Hahaha, aint that the truth?:D
I think you hit it on the nose about the pump shot, as I drive pretty lightly most of the time, and my 1406 does the same thing unless I step on it enough to get the pump shot.
I notice zero difference in the motor running and power when it does it, but I did quit looking at the A/F unless something feels different.
(Like when the car hesitated one day for no apparent reason and the A/F was up around 19)
I got an extra fuel pump on my way home that day and the one in the car died the next day.:D (It was a cheapie electric) and the new one is a Carter rotary.