POLINI Vespa Carburettor Main Jet Kit (SI 20.15-17 A-D/20.20-26.26E/G/H)

The main jet is found at the bottom of the jet stack on the SI Carburettor. The main jet is responsible for regulating the amount of fuel available for premixing. From changing the exhaust to changing the cylinder it is necessary changing the main jet to suit the scooter. 

The Polini Main jets are precisely made and can be used for a variety of different SI Carburettors. 

Comes with the following Sizes:

• 110
  
• 113
  
• 116
  
• 119
• 122

Comparison No. 4576 (DELLORTO), 363.0002 (POLINI)