Idle Jet (42/160) for SI Carbs for Scooters & Mopeds
ITEM# TT-26121
Guarantee Safe Checkout
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Description
Idle Jet for SI Carburetors on Scooters and Mopeds
This idle jet is built for SI carburetors used on a range of scooters and mopeds. It helps control the fuel and air mixture across the lower third of throttle travel. Among the scooter carburetors & jets available, it keeps acceleration smooth by reducing flat spots that often come from an incorrect size. Choosing the right size matters for good performance, so it helps to know what your scooter requires.
How the Idle Jet Works
The idle jet sits alongside the main jet and the two work together to meter fuel. A size that doesn't suit your setup can cause performance problems, most noticeable when accelerating. The jet has two separate measurements: the first gives the diameter of the fuel inlet, and the second gives the diameter of the air inlet. Changing either size can make a real difference to how the scooter runs.
When to Swap Your Idle Jet
Consider replacing the idle jet if acceleration feels uneven or you notice flat spots. Those symptoms usually suggest the current jet size isn't right for your scooter. Some older models use idle jets without air holes, which need particular sizes to work correctly. Keeping an eye on how your scooter behaves will help you decide when a replacement is due.
Specifications
- Size: 42/160
- Position: Next to the main jet
- Fits: SI carburetors on scooters and mopeds
Fitment
How to choose: Pick an idle jet size that suits your carburetor's setup. Available sizes are 38/120, 42/160, 45/120, 45/140, 48/160, 50/120 and 55/160. The first number is the fuel bore and the second is the air bore.
Shop more: Scooter Carburetors & Jets · Scooter Parts
Reviews
