Main Jet #118 for SI Carbs for Scooters & Mopeds
ITEM# TT-26441
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Description
Main Jet #118 for SI Carburetors on Scooters and Mopeds
The Main Jet #118 is a key part of SI carburetors fitted to scooters and mopeds. This small, cone-shaped jet controls how much fuel passes through, which has a direct effect on engine output and efficiency. Among scooter carburetors & jets, it is one of the parts most often changed when tuning. Several sizes exist, so this particular jet suits a range of engine setups, especially those that have been modified for more performance.
How It Works and Why It Matters
The main jet sits at the lower end of the jet stack, where it meters the fuel going to the engine. The jet number reflects the flow rate, so a higher number lets more fuel through. Riders often try several sizes to reach the performance they want, particularly on modified engines that need extra fuel for stronger acceleration and higher top speed.
Signs It May Need Replacing
If acceleration feels slow or fuel use has crept up, the main jet is worth inspecting. Jets can clog or wear down over time, and either problem can noticeably hurt how the engine runs. Changes to the scooter or moped engine can also call for a different jet size so the vehicle keeps running smoothly and economically.
Specifications
- Size: 118
- Position: Bottom of the main jet stack
- Compatibility: SI carburetors
- Fits: Dell'Orto/Spaco SI carburetors on vintage Vespa 125, 150, 160/180, 200 and Stella 150 2T
Fitment
Fits:
- Vespa 125 (VNB, VNC Super 125, VNL GT/GTR, VNX P/PX 125)
- Vespa 150 (VBA, VBB, VBC Super 150, VLA GL150, VLB Sprint, VLX P/PX 150)
- Vespa 160/180 (VSB GS 160, VSC SS 180, VSD Rally 180, with compatible SI setup)
- Vespa 200 (VSE Rally 200, VSX P/PX 200 E)
- Stella 150 2T (with compatible SI carburetor)
How to choose: Pair your carburetor with an SI type (SI 20/15, 20/17, 20/20 or 24/24) and confirm the main jet stack lines up, since #118 is a tuning size and not the stock jet for every model.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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