Fuel mixture control

Generally an internal combustion engine requires much more fuel in high humidity atmosphere like rainy day.
Solex 34PICT3 carburetor in VW 1302 Super Beetle is set originally in lean mixture considerably because of Anti-Pollution concept invited in 1970.
Main jet is factory set at #127, this one should be replaced into #130, the stumbling and hesitating acceleration would not be improved if the volume of acceleration pump is adjusted utmost.

Upper description is obtained from Web site and I'm going to try this procedure, by not make a hole drilling by exchange main jet itself replacement, without burning out the safety bridge until passing through completely.
I really admire the superior capability of recent computerized automobile especially in the compensations and corrections of atmospheric changes.