Main Jet #100 for SI Carbs for Scooters & Mopeds
ITEM# TT-25800
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Description
Main Jet #100 for SI Carbs in Scooters and Mopeds
The Main Jet #100 is an essential part for adjusting fuel flow in scooter and moped carburetors. Designed for SI carburetors, it is a fit for a number of common models. Because it controls the air-fuel ratio, it can have a noticeable effect on how the engine runs. It is one of the carburetor parts and jets for scooters that can help you fine-tune engine efficiency to suit how you ride.
How Main Jets Work
Main jets are small, cone-shaped parts that regulate how much fuel reaches the engine. They are made in many sizes, usually ranging from 82 to 165. Classic Vespas tend to use jets in the 85-116 range, while modified engines often call for larger sizes to handle higher fuel needs. Picking the correct jet is key to getting the performance you want from your scooter.
Signs You May Need a New Main Jet
A main jet swap may be worth considering if your engine has been modified or if you are noticing performance problems. Alterations to the exhaust, the intake, or the engine's tuning can all make a different jet size necessary. Trying out various sizes is a practical way to discover what works best for your build and the conditions you ride in.
Specifications
- Size: 100
- Position: Bottom of main jet stack
- Fits: Dellorto/Spaco SI carburetors with compatible SI main jet stacks (20/15, 20/17, 20/20, 24/24)
Compatibility
Fits:
- Vespa vintage large frame: VNB, VBA, VBB, VNC 125 Super, VBC 150 Super, VNL GT/GTR, VLB Sprint, VLA GL150, VSD Rally 180, VSE Rally 200 (compatible SI carburetor and main jet stack required)
- Vespa P/PX: VNX 125, VLX 150, VSX 200 E (compatible SI carburetor and main jet stack required)
- Vespa VSB GS 160, VSC SS 180 (only with compatible SI carburetor setup)
- Stella 150 2T (compatible SI carburetor setup only)
How to choose: Select the jet size that suits your engine, since #100 is not the right size for every vehicle on the list. Only use it with SI main jet stacks, not with SHA, SHB, PHBG, CVK, or Keihin systems.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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