Main Jet #150 for SI Carbs for Scooters & Mopeds
ITEM# TT-26280
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Description
Main Jet #150 for SI Carbs on Scooters and Mopeds
This main jet is a cone-shaped piece that sits at the base of the jet stack and controls how much fuel reaches the engine. The #150 size suits a range of scooter and moped carburetors, including those fitted to classic Vespas. You can find more options in our scooter carburetors & jets range. It is especially useful for tuning modified engines that need a richer fuel supply.
Function and Importance
The main jet governs the amount of fuel blended with incoming air before combustion. Its size determines fuel flow, and a higher number lets more fuel through. Riders who modify their scooter to get more out of it will often find this component especially relevant.
Installation and Adjustment
Fitting this jet is simple: it replaces the existing one in the same position, so even home mechanics can handle the job. Dialing in the correct mixture, though, usually takes a bit of experimenting. Check the jetting guide for advice on getting the best result for your particular setup.
Specifications
- Size: #150
- Position: Bottom of main jet stack
- Fits: SI carburetors on scooters and mopeds (main jet #150 size)
Fitment
How to choose: Pick the size that matches your carburetor's jetting setup. This one is a #150, and the available range runs from 82 to 165. Expect to experiment before settling on the right number.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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