Main Jet #165, SI Carbs for Scooters & Mopeds
ITEM# TT-26276
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Description
Main Jet #165 for Scooters and Mopeds
This main jet sits within the carburetor of scooters and mopeds, where it governs how much fuel reaches the engine. Available in sizes from 82 up to 165, the #165 version delivers the greatest fuel flow in that range. It belongs to the range of carburetor parts and jets for scooters, and it suits performance-modified engines that need extra fuel to run well.
How Main Jets Work
Main jets have a cone-shaped body and mount at the base of the jet stack inside the carburetor. Their job is to meter the fuel that enters the engine while it runs. Jet size sets the flow rate, so a higher number lets more fuel through. Changing the main jet is one way to fine-tune engine output to match your particular tuning goals.
Signs You May Need a New Jet
A main jet swap makes sense when you have changed the engine for more performance or when fuel economy has dropped off. Many riders test several jet sizes to find what works best with their build. Because jetting is largely a matter of trial and adjustment, a jetting guide can help you narrow down the right size.
Specifications
- Size: #165
- Position: Bottom of main jet stack
- Fits: SI carburetors (main jet stack, bottom position), for scooters and mopeds; size #165
Fitment
Fits:
- Vintage Vespa (SI carburetor; jetting depends on your engine)
How to choose: The #165 size sits at the upper end of the 82-165 range. Confirm it matches your engine's jetting before you fit it.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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