FITS THE FOLLOWING SCOOTER MODELS  VESPA PX200E 1984 - 2005 WITH OIL INJECTION  VESPA Rally 200 VSE1T  1972 1979 WITH OIL INJECTION  VESPA P200E / PX200E 200 VSX1T  1977 - 1983 WITH OIL INJECTION  VESPA PX200E '98 / MY / Millenium 200 VSX1T  1998 - 2005 WITH OIL INJECTION  VESPA PX200E Lusso / EFL / Elestart 200 VSX1T  1983 - 1997 WITH OIL INJECTION 

The SI carburettors are fitted as standard to all Vespa Largeframe models (apart from the GS160/SS180). Their design is simple in terms of its structure and thanks to the main jet, main air correction jet, idle jet and choke jet, throttle slide and idle running mix regulating screw, they offer similarly precise setting options as the larger drum or flat side carburettors.

They are also easy for non-professionals to tune as adjusting the main jet normally achieves the required effect.

Their shorter intake duct helps the throttle response of the engine and makes the SI carburettors the first choice for disc valve engines. With an SI and the corresponding peripherals, over 20 PS are possible at the rear wheel, their cooling capacity is rather limited, however.

For this reason, it is better for cylinders under strong thermal load to be driven with a bigger carburettor.

"Some years ago Dell'Orto made an agreement with Spaco and Piaggio to produce carbs type SI in India. So Spaco produces on license and delivers to Dell'Orto, Dell'Orto guarantees the quality and delivers the SI carbs to Piaggio for first equipment and to all other customers for after market.