The auxiliary nozzle of the SI carburettor does not have the simple function of a conventional nozzle, ie the pure regulation of the amount of fuel. With the introduction of the PX in 1977, the previously used SI carburettor type and its auxiliary nozzles were modified. The old carburetor types, such as those still used in the rally engines, had a separate air duct for the auxiliary nozzles. These were consequently equipped with nozzles that could only regulate the amount of fuel (simply designated nozzles, e.g. Rally 200 ND = 50) DOUBLE FUNCTION The new carburettor types have a sealed air hole for the auxiliary nozzle. Since then, Piaggio has been using auxiliary nozzles with a double function, recognizable by the double designation (e.g. 55/160). For this purpose, the auxiliary nozzles are drilled hollow from above and thus themselves ensure that the gasoline is premixed with air. In other words, the mixture preparation in the auxiliary nozzle area works like in the main nozzle assembly via an air nozzle and a main nozzle, here only combined in one part. NOZZLE COMPARISON In the past, to make it easier to compare the various nozzles, a quotient was formed from the values for the air nozzle (160) and the actual nozzle size (55) (in this example = 2,91). The resultant value should then help to classify the nozzle in a rating system from lean to fat (the smaller the value, the fatter). However, this approach is very rudimentary and not always z ...
- bgm - item number: BGM857KT
- Availability: in stock (Please check availability here in Scooter Center Shop)
- Weight: approx. 0,04 kg
- Category: Engine> carburetor> carburetor jets
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