This is used to ensure enough flexibility to prevent high frequency vibrations being transmitted to the fuel in the float chamber, whilst preventing air being drawn in.
throttle spindle kit for single HS4 type carbs. Quantity required 1 kit the butterfly is available separately as WZX1323 for plain-WXZ1325 with air valve
This fitting kit suits all later day 1.25" and 1.5" twin carb set ups where the balance rods between the carbs required are equal length (2.25"), some early carbs had the balance bar with a triangular plate that were a shorter length. The kit has the original type abutment bracket that fits to the inlet manifold to guide the accelerator…
The original pre waxstat jet with the red plastic bottom, first appeared on 850/998 minis in Feb 1974 FZX3003 has ABP needle CUD1037, FZX3013 has AAC needle CUD1002.