Alu-bronze threaded bushing M7 / M6 x 0.75 for needle jet and slide stop screw ►see details

Standard size of needle jet and slide stop screw is M6 x 0.75

When the M6 screw thread in the carburetor body is damaged, it can be enlarged to M7 x 0.75.

Drill size is 7 - 0.75 = 6.25 mm. 

The M7 / M6 x 0.75 alu bronze bushing is then glued (Loctitie) into the carburetor body