Main Jet #112 for SI Carbs for Scooters & Mopeds

Main Jet #112 for SI Carburetors in Scooters and Mopeds

The #112 Main Jet sits in the main jet stack of a scooter carburetor, where its cone shape regulates how much fuel reaches the engine. It is commonly used on vintage Vespa models, which typically run jets from 85 to 116. As one of the scooter carburetors & jets available, it has a noticeable effect on how your machine runs, so it plays a real part in keeping performance and throttle response where they should be.

How Main Jets Work

Main jets, including this #112, are offered in different sizes, and each size sets the volume of fuel entering the engine. Jets generally range from 82 to 165. A larger jet passes more fuel, which tends to suit engines that have been modified for higher output and need a richer mixture to run properly.

Signs It May Be Time to Change the Main Jet

If you are tuning a scooter for better performance or have modified the engine, swapping the main jet may be part of that work. Unusual running behavior can also indicate that the jet needs changing. Choosing the correct jet is key to smooth running and good fuel economy.

Specifications

• Size: #112
• Position: Bottom of the main jet stack
• Fits: Dellorto/Spaco SI carburetors with compatible SI main jet stacks (20/15, 20/17, 20/20, 24/24)

Fitment

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)
• Vespa P/PX (VNX 125, VLX 150, VSX 200 E)
• Vespa VSB GS 160 / VSC SS 180 (only with a compatible SI carburetor setup)
• Stella 150 2T (compatible SI carburetor setup only)

How to choose: Pick the jet size that suits your engine. #112 is one available size and is not the right choice for every vehicle listed, and it must work with a compatible SI main jet stack.

Shop more: Scooter Carburetors & Jets · Scooter Parts