pe reivers

I see three mistakes in his first posting.
1) the stamped notch in the throttle butterfly valve must lie against the throttle shaft, so the butterfly chamfer will fit exactly in the bore.
2) The high speed jet screen is not meant as a filter. It is a capillary screen that acts as a high speed jet check valve. Fuel can get through, but air cannot.
3) No mention is made of the combined function of the idle jets. They supply fuel AND air, depending on valve position. At full throttle, they still supply fuel to the mixture, because the pressure downstream of the venturi is still lower than the fuel pressure.