Main Jet #74 for SHA/SHB Carbs for Scooters & Mopeds
ITEM# TT-25804
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Description
Main Jet #74 for Vespa Small Frame Scooters and Mopeds
This #74 main jet is built for Vespa small frame scooters and mopeds that use 16mm and 19mm carburetors. It also works with PHBG carburetors. Among the scooter carburetors & jets we carry, it controls how fuel is metered, which directly influences power and fuel economy. Finding the right setting often takes some experimenting, so it's worth taking your time when tuning your ride.
How the Main Jet Works
The main jet governs how much fuel mixes with incoming air before it reaches the engine. On small frame Vespas, the carburetor uses just two jets: the main jet and an idle jet. This jet is available in sizes from 37 to 88, so you can fine-tune it to suit the performance you're after.
Fitting and Setting Up
Swapping the main jet is a manageable job for anyone comfortable with scooter maintenance. It takes the place of the original jet, changing how fuel flows through the carburetor. For best results, follow the jetting guidance provided so the engine runs as intended.
Specifications
- Size: #74
- Position: Main jet in carburetor
- Fits: SHA/SHB carburetors on Vespa small frame scooters with 16mm and 19mm carbs, and PHBG carbs
Compatibility
Compatible with:
- Vespa small frame (16mm and 19mm SHA/SHB carburetors)
- PHBG carburetors
Choosing a size: The jet number is a tuning value rather than a fitting dimension. #74 is one of several main jets ranging from 37 to 88, so confirm the size currently installed before deciding which one to switch to.
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