The idle jet mainly affects the low and mid range rev. If the scooter runs noisily tickover this can be eliminated by selecting an appropriate idle jet. We stock idler jets for VHST carburetors in sizes S35-S45. We can offer the complete VHSB / Racing / VHSC / VHSH idle jet block in sizes 38-50. We also have the bottom element of this two-part jet combination in stock individually in sizes 30-70. As a rule, the following applies: the higher the value, the richer the pour. Conclusion: Top quality DELLORTO. Indispensable for precise adjustment of the tickover adjustment. SIP-TIP: For optimal care, clean your carburetor with carburetor cleaner (part number 55034000) on a regular basis.