Main Jet #140, SI Carbs for Scooters & Mopeds
ITEM# TT-26275
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Description
Main Jet #140 for Classic Vespas and Modified Scooters
The Main Jet #140 is a cone-shaped part that sits in the main jet stack of a scooter carburetor. It controls how much fuel flows through, and it suits a range of scooter and moped setups, especially older Vespas. Because it sets the fuel-to-air mix, it has a direct role in how your ride's fuel system runs. You can browse more carburetor and jet options to find other parts that help with performance.
Knowing the Jet Size Range
Main jets are made in sizes from 82 up to 165. Classic Vespa models commonly use jets between 85 and 116. Scooters that have been modified for more power often need larger jets to supply the extra fuel they burn. The size you select controls how much fuel reaches the engine, which in turn shapes overall performance.
Tuning for Your Setup
Setting up a carburetor usually takes some trial and error. The right jet depends on several things, such as engine changes and the conditions you ride in. For the best outcome with your particular build, follow the jetting guidance available to you.
Specifications
- Size: #140
- Position: Main jet stack
- Fits: SI carburetors on scooters and mopeds, main jet stack position (size #140)
Fitment
How to choose: Check the number stamped on your current main jet, or use the size your engine's jetting specifies. This jet is #140, and available sizes run from 82 to 165.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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