Main Jet #63 for SHA/SHB Carbs for Scooters & Mopeds
ITEM# TT-25809
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Description
Main Jet #63 for Small Frame Vespa Scooters and Mopeds
This main jet is built for small frame Vespas that run 16mm and 19mm carburetors, along with PHBG carburetors. It handles fuel delivery in the carburetor, which helps the engine perform better. Like other scooter carburetors & jets, it is simple to swap out during routine service. Picking the correct jet size matters if you want your scooter tuned the way you intend.
How Main Jets Work
The main jet regulates how much fuel reaches the engine at higher speeds. Small frame Vespas use two jets: a main jet and an idle jet. Main jets come in sizes from 37 to 88, so choosing the right one is key for adjusting performance and keeping the engine running well.
Signs It's Time to Change the Main Jet
You may need to replace the main jet if the scooter starts to hesitate or loses acceleration. Getting the jetting right often takes some trial and error, since it depends on your setup and how you ride. For guidance on jetting procedures and getting the best performance, check the available resources.
Specifications
- Size: #63
- Position: Main Jet
- Fits: Small Frame Vespas with 16mm and 19mm SHA/SHB carbs, and PHBG carbs
Compatibility
Compatible with:
- Vespa small frame (16mm and 19mm SHA/SHB carbs)
- PHBG carbs
How to choose: Check the jet size stamped on your old jet or the size listed for your carburetor. #63 is one size within the 37-88 range.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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