Main Jet #47 for SHA/SHB Carbs for Scooters & Mopeds
ITEM# TT-26080
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Description
Main Jet #47 Suited to Small Frame Vespas and Comparable Models
This Main Jet #47 is made for small frame Vespas running 16mm and 19mm carburetors, PHBG units included. It plays a central role in adjusting your scooter's fuel setup. Acting as the main jet, it sets how much fuel enters the engine under acceleration. Picking the correct jet size matters because it has a direct effect on how the scooter performs, which is why this part sits among the core items in scooter carburetors & jets.
How the Main Jet Works
The main jet governs the fuel mixture delivered to the engine and operates together with the needle and idle jet. It contributes directly to how efficiently the engine runs. When you tune a scooter, changing the main jet can produce clearly noticeable differences in performance, so testing is often needed to find the best setting.
Signs It May Need Replacing
Weak throttle response or a drop in power are good reasons to check the main jet. Jets can gradually clog or wear down, and either problem can noticeably hurt performance. Inspecting this part on a regular basis helps keep your scooter running smoothly.
Specifications
- Size: 47
- Position: Main Jet
- Fits: Small Frame Vespas with 16mm and 19mm SHA/SHB carbs, and PHBG carbs
Fitment
Compatible with:
- Vespa small frame scooters (16mm and 19mm carbs)
- PHBG carbs (compatible)
How to choose: Install it in the carb position labelled Main Jet, and only when your carburetor is a 16mm or 19mm SHA or a PHBG. Main jets are available in sizes 37-88.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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