Float Level

Invert float chamber cover assembly without a gasket. Use a universal float level gauge to measure distance from bottom of float to surface of float chamber cover. Distance should be .748-.826" (19-21 mm). See Fig 1 .

Fig 1: Checking Float Level of Solex Carburetor
If float level is not within specified range, adjust by increasing or decreasing the number or thickness of needle valve shims. Adding or subtracting a shim will change fuel level about 3 times the thickness of shim. Adding shims lowers level.
NOTE: Shims are available in a set of 3 thicknesses: .012" (0.3 mm), .016" (0.4 mm) and .020" (0.5 mm).
To install shim, remove the float, needle and needle seat. Check filter for clogging or damage. Install new "O" ring to needle seat. Install shim and filter to needle seat. See Fig 2 . Install assembly into float chamber cover. Install seat retainer and screw firmly.
Insert needle into seat and install float. Recheck float level as instructed in step 1).

Fig 2: Adding Float Level Adjusting Shims