Main Jet #135, SI Carbs for Scooters & Mopeds
ITEM# TT-26370
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Description
Main Jet #135 for Scooters and Mopeds
The Main Jet #135 is a key component of the carburetor setup in a range of scooters and mopeds. It controls how much fuel reaches the engine, which helps the engine run efficiently. This jet is especially well suited to classic Vespas, typically in the 85-116 range, though engines with performance modifications may call for larger jets. It belongs to the scooter carburetors & jets lineup and can have a major effect on fuel delivery and how the engine behaves.
How the Main Jet Works
This small, cone-shaped jet sits in the lower part of the main jet stack. Its bore size sets how much fuel gets delivered to the engine. The number on the jet reflects its flow capacity: a higher number lets more fuel through, which matters when tuning for performance.
Signs It May Need Changing
Finding the right main jet size is usually a matter of trial and error, since every engine responds differently depending on its modifications and tuning. If you notice performance problems or a clear change in how your ride runs, it may be worth looking at jetting. Follow the specific jetting instructions for guidance through the process.
Specifications
- Size: #135
- Fits: SI carburetors on scooters and mopeds, #135 main jet
Fitment
How to choose: Pick the size that matches the number stamped on your current main jet, or tune to suit your engine. Available sizes run from 82 to 165, and a larger number means more fuel flow.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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