Main Jet #84 for SHA/SHB Carbs for Scooters & Mopeds
ITEM# TT-25860
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Description
Main Jet #84 for Vespa Small Frame Scooters and Mopeds
This main jet suits small frame Vespa scooters running SHA or SHB carburetors, along with PHBG models. It controls how much fuel mixes with incoming air, which directly affects how the engine runs. You will find it listed among our carburetor and jet options. Getting the jetting right often takes some experimenting, and our blog has more tips on that process.
What the Main Jet Does
The main jet meters fuel flow when the throttle is opened to the middle and upper range. Keeping this flow correct helps the engine hold its power and run efficiently. Hesitation or weak acceleration can be a sign that the main jet needs checking or swapping.
Fitting Notes
This jet drops into the existing carburetor and takes the place of the stock jet. It is made to match the original engine specifications, so it works with your current setup. Careful installation makes tuning easier and gives the best chance of a performance gain.
Specifications
- Size: 84
- Position: Main Jet
- Fits: Vespa small frame scooters with 16mm and 19mm SHA/SHB carbs, and PHBG carbs
Fitment
Fits:
- Vespa small frame (16mm and 19mm SHA/SHB carbs)
- PHBG carbs
How to choose: Check the number stamped on your carburetor and the jetting your engine needs. This is size 84, which is one of the 37-88 sizes we carry.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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