Dell'Orto 55/160 (2.91) sideline for the SI carburetor, suitable for your Vespa Largeframe scooter. A list of the exact models can be found below in the drop-down menu under «suitable for the following models».
The bypass is a central component for the tuning of your SI carburetor and primarily influences the low to medium speed range. In the case of SI secondary throttles with a double designation, it is not only responsible for pure fuel metering: due to the design, the gasoline is already premixed with air in the throttle, which supports mixture preparation in the partial load range. The marking 55/160 stands for the ratio of the two numbers – the smaller the calculated value, the «richer» your scooter runs at moderate speeds, the larger, the «leaner». Especially for longer trips in the half-throttle range, it is worth tuning up here.
| Manufacturer | Dell'Orto |
| Camouflaged | No |
| Material | Brass |
| Component group Carburetor | Spraying |
| Carburetor type | SI |
| Nozzle type | Secondary nozzle |
| Drive | Slot |
| Nozzle thread | M5x0.8 (standard thread) |
| Thread length | 5.5 mm |
| Total length | 28.9 mm |
| Vespa | Vespa PX, T5, Cosa - PX80 E Lusso · V8X1T · 1983 - 1993 Lusso / Arcobaleno , PX100E · VIX1T · Indien , P125X · VNX1T · 1977 - 1982 (PX alt) Aussenverschluss , P125X · VNX2T · 1981 - 1984 (PX alt) Innenverschluss , PX125 E · VNX2T · 1982 - 1993 / Lusso / Arcobaleno , PX125 · VNX2T · 1993 - 1996 Classic , PX125 · VNX2T · 1997 - 1999 (Disc) , PX125 · ZAPM471 · 2001 MY Katalysator (Millenium) , P150X · VLX1T · 1978 - 1993 , P150S · VBX1T · 1978 - 1990 , PX150 · ZAPM742 · 2001 MY Katalysator (Millenium) , P200E · VSX1T · 1977 - 1984 (Zündschloss Lenkkopf) , PX200 · VSX1T · 1984 - 1993 Lusso / Arcobaleno , PX200 · VSX1T · 1993 - 1996 Classic , PX200 · VSX1T · 1997 - 1999 (Disc) , P80X · V8X1T · alt (Zündschloss Lenkkopf) |
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