Main Jet #86 for SI Carbs for Scooters & Mopeds
ITEM# TT-25771
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Description
Main Jet #86 for Scooters and Mopeds
This cone-shaped piece sits at the base of the jet stack inside the carburetor. It suits a range of scooter and moped carburetors, and is most often seen on vintage Vespas. Jet sizes run from 82 to 165, with the majority of stock setups falling between 85 and 116. As one of the key items in our range of carburetor parts and jets, it can help refine fuel delivery, particularly on engines that have been modified for more power.
What the Main Jet Does
The main jet controls how much fuel reaches the carburetor, which in turn affects how the engine runs and how efficiently it uses fuel. A bigger jet lets more fuel through, something modified engines often need to run correctly. Getting the jetting right for your particular build usually takes some trial and error before you find the best result.
Fitting Notes
Swapping the main jet is a simple job for anyone comfortable working on scooters. In most cases it drops straight into the existing carburetor, so changing an old jet for a new one is uncomplicated. If you have made other modifications, you may need to re-check the jetting so the engine runs smoothly.
Specifications
- Size: #86
- Position: Main jet
- Fits: SI carburetors for scooters and mopeds, main jet size #86
Fitment
How to choose: Only pick a main jet #86 if your tuning calls for this size. The range covers 82 to 165, and higher numbers allow more fuel to flow.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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