Jet -WEBER- (74)

The main jet is significantly involved in the mixture preparation of the carburettor. If it is too small, the engine dies off under full load and/or runs so lean that the piston and cylinder overheats and cylinder damage would result.
If it is too large, the mixture is too rich, the engine runs very unevenly and can only deliver a fraction of its possible power.

Weber has a short liaison with the Piaggio group. So in many Piaggio / Gilera cars from about 1998 on Weber carburettors were used. These are based on the usual models like the Dell'Orto PHVA. So the cold start mechanism is controlled by a so-called electrochoke.

completely own nozzle type with quite rough thread pitch.

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