Main Jet #122, SI Carbs for Scooters & Mopeds
ITEM# TT-26279
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Description
Main Jet #122 for Vespa and Other Scooters
The Main Jet #122 suits large frame SI carburetors used across a variety of scooter models. This small, cone-shaped piece sits at the bottom of the main jet stack and controls how much fuel passes through. Because engine setups differ, it gives builders a way to adjust the mixture. If you are browsing carburetor and jet options for scooters, this part plays an important role in tuning performance and fuel efficiency.
Getting to Know Jet Sizes
Main jets are offered in sizes ranging from 82 to 165, and the #122 falls in the middle of that range. Classic Vespa scooters typically use jets between 85 and 116, while engines with performance modifications often call for larger jets to allow more fuel flow. Picking the right size matters for getting the output you want, which is why this part is useful to both hobbyists and professional mechanics.
Fitting and Tuning
Swapping the main jet is a simple job. It drops straight into the current carburetor assembly, so the old jet can be removed and the new one installed without extra modifications. Dialing in the ideal jetting, though, can take a bit of testing to find what works best for your particular engine.
Specifications
- Size: 122
- Position: Main jet
- Fits: SI carburetor main jet, size 122 (large frame SI carburetor, performance-modded engines)
Compatibility
How to choose: Confirm the number stamped on the jet reads 122, and install it only in a large frame SI carburetor.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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