Vespa Dellorto SI 20.15-17 A-D/20.20-26.26E Carburettor Main Jet Set Pack (105-128) NumberPlate Thickest Diameter 29mm

Thickest Diameter 29mm

But in the middle range there is a lot of steam and the Polini turns freely upwards

Scomadi TL125

0 mm thick rise bar

Vespa Dellorto SI 20.15-17 A-D/20.20-26.26E Carburettor Main Jet Set Pack (105-128) NumberPlate Thickest Diameter 29mmVespa Dellorto SI 20. 15 17 A D 20. 20 26. 26E Carburettor Main Jet Set Pack (105 128) In the SI carburettor, the main jet is located in the jet block under the mixer tube and main air correction jet. It is responsible for making a certain amount of petrol available for premixing. With all tuning measures, no matter how small, it is necessary for the main jets to be raised, as they mainly impact on the middle and upper rev range. Their effect is