Jet, Main #64 for SHA/SHB for Scooters & Mopeds
ITEM# TT-25829
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Description
Main Jet #64 for Small Frame Vespa Scooters and Mopeds
The Main Jet #64 suits Small Frame Vespa scooters and mopeds that use either a 16mm or 19mm carburetor, PHBG models included. It controls fuel delivery, which has a direct effect on how the vehicle performs. It belongs to the scooter carburetors & jets range, since these parts directly shape how well the engine runs. Available sizes run from 37 to 88, and this particular jet provides fuel flow matched to what the engine needs, so it plays an important role in the scooter's overall performance.
How Main Jets Work
A main jet sets how much fuel gets mixed with incoming air as it enters the engine. On Small Frame Vespas, it operates alongside an idle jet to keep the engine running smoothly. When more power is called for, the main jet passes a larger fuel flow, which helps with throttle response during acceleration.
Signs It May Need Changing
Weak acceleration, uneven engine behavior, or trouble starting can all point to the main jet being worth a look. Finding the right jet usually takes some testing, since each engine setup differs. Jetting guides are a useful reference when adjusting your scooter's carburetion.
Specifications
- Size: #64
- Position: Main Jet
- Fits: Small Frame Vespas with 16mm and 19mm SHA/SHB carburetors, and PHBG carbs
Fitment
Compatible with:
- Small Frame Vespa with 16mm carburetor (SHA/SHB)
- Small Frame Vespa with 19mm carburetor (SHA/SHB)
- PHBG carburetor
How to choose: Select #64 only when you need that main jet size for your carburetor. Available sizes span 37 to 88, and finding the correct one generally comes down to trial and error.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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