for VHSB/?Racing/?VHSC/?VHSH carburettorProduct descriptionThe idle jet primarily influences the lower and middle rev range. If the scooter runs noisily on tickover this can be eliminated through the selection of an appropriate idle jet. We stock the idle jets for the VHST carburettors in sizes S35-S45 and U32-U45. We can offer the complete idle jet block for the VHSB/Racing/VHSC/VHSH in the sizes 38-50. We also stock the lower element of this two part jet combination individually in the sizes 30-70. As a rule, the following applies: The greater the value, the richer the jet. Conclusion: Top DELL??ORTO quality. Indispensable for a precise tuning of the tickover setting. -TIP: For optimum care, clean the carburettor with carburettor cleaner (part no 55034000) on a regular basis.OEM numbers (for comparisons):B13086B040 (MALOSSI)1308640 02 (DELLORTO)