Main Jet #68 for SHA/SHB Carbs for Scooters & Mopeds
ITEM# TT-25864
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Description
Main Jet #68 for Vespa Small Frame Carbs
This main jet suits small frame Vespa scooters running 16mm or 19mm carburetors. It works with SHA and SHB carburetors, and also with PHBG models. As a key piece of the fuel system, it controls how much fuel reaches the engine, which makes it a meaningful factor in how the scooter performs. You'll find it alongside other scooter carburetors & jets. Getting the best result may take some trial and adjustment on your particular setup.
How the Main Jet Works
The main jet is the main route for fuel into the carburetor. Along with the needle and idle jet, it meters fuel across different throttle openings. Choosing the right size helps the scooter run efficiently, accelerate smoothly, and use fuel sensibly. Using the correct main jet size matters for keeping the engine responsive and performing well.
Signs It May Need Replacing
Poor acceleration, stalling, or uneven running can point to a main jet that needs swapping out. Jets can clog or wear over time, which upsets the air-fuel balance. Checking it periodically helps keep the engine healthy and the scooter running dependably.
Specifications
- Size: #68
- Position: Main Jet
- Fits: Vespa small frame scooters with 16mm and 19mm SHA/SHB carbs; also fits PHBG carbs
Fitment
Compatible with:
- Vespa small frame (16mm SHA/SHB carb)
- Vespa small frame (19mm SHA/SHB carb)
- PHBG carbs
How to choose: Check that the carb body measures 16mm or 19mm. This #68 jet is made for those two sizes. Main jets are available from 37 to 88, and #68 sits within that span.
Browse further: Scooter Carburetors & Jets · Scooter Parts
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