zerorev3rev4

this is what you should have mark i removed bearing and no shims ,, i have never fitted shims on input shaft right side it could be possible the spacer 2nd part from right comes in differnt thicknesses

dirt in a jet will cause less fuel and run lean , it seems the needle is higher or the air is restricted ,,ie less air = running rich or if you restrict the exhaust it will run rich did you oil the filter