Main Jet #57 for SHA/SHB Carbs for Scooters & Mopeds
ITEM# TT-25654
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Description
Main Jet #57 for Vespa Small Frame Scooters and Mopeds
This Main Jet #57 suits Vespa small frame scooters that run 16mm and 19mm carburetors, and it also works with PHBG carburetors. It plays a central role in metering fuel correctly and keeping the engine running well. As with other items in our carburetor and jet range, it benefits from being chosen and tuned with care.
What a Main Jet Does
The main jet controls how much fuel-air mixture reaches the engine. On a small frame Vespa, there are typically two jets in play: the main jet and the idle jet. Fuel moves through the main jet and past the needle, which shapes how the engine performs overall. Main jets come in sizes from 37 to 88, and this one is size 57.
Fitting and Tuning Notes
Getting the best result from a new main jet often takes some experimenting. Jetting has a noticeable effect on throttle response and how efficiently the engine runs. If you want guidance on adjusting your setup, look through the jetting instructions and reference material that are available.
Specifications
- Size: 57
- Position: Main Jet
- Fits: Small frame Vespa scooters with SHA/SHB carbs (16mm and 19mm), also PHBG carbs
Compatibility
Compatible with:
- Small frame Vespa (16mm and 19mm SHA/SHB carbs)
- PHBG carbs
Choosing the right size: Check the number stamped on your current main jet. This is a size 57 main jet for 16mm and 19mm carbs.
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