Main Jet #155, SI Carbs for Scooters & Mopeds
ITEM# TT-26366
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Description
Main Jet #155 for Classic Vespas and Tuned Scooters
This Main Jet #155 helps control how much fuel reaches the engine through the carburetor. It is made for classic Vespas and also works with tuned scooters that call for larger jets to gain extra output. Because the jet size sets the fuel flow, it is an important element when dialing in your ride. You can find it among other scooter carburetors & jets for building the fuel mix your engine needs. Changing the jet size can sharpen throttle response and improve how efficiently the engine runs.
Getting to Know Jet Sizes
The jet sits in the lower part of the main jet stack and has a small conical shape. Available sizes run from 82 to 165, and the #155 is a common pick for performance builds that need more fuel flow. Higher jet numbers let more fuel through, which helps modified engines that run better on a richer mixture.
Signs It May Be Time to Swap the Main Jet
Think about changing the main jet when you have made engine upgrades or notice performance problems. If the scooter burns more fuel than expected or runs roughly, a different jet size may fix the issue. Finding the right size for your setup often takes trial and adjustment, so plan to test and refine your settings as you go.
Specifications
- Size: 155
- Position: Main Jet Stack
- Fits: SI carburetors, main jet stack position, size #155
Fitment
How to choose: Pick a jet size that matches your carburetor's main jet stack. This part is #155, and the sizes offered run from 82 to 165.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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