Construction of a fuel supply pipe in a rotary throttle valve type carburetor

In a carburetor with a rotary throttle valve, a fuel supply pipe comprising;

• a first tubular portion constructed of metal having a tubular passage to allow fuel flow therethrough and adjacent one end an outside diameter slightly larger than the diameter of the corresponding mounting hole on the carburetor where said portion is fitted to provide an interference fit therein, and a second tubular portion formed of synthetic resin, having a tubular passage to slidably receive a needle valve therein and to allow fuel flow therethrough, and a fuel jet orifice formed in the sidewall of the metering tip portion to allow delivery of fuel from said second portion, said first and second portions are telescopically connected such that the passage of the first portion is in communication with the passage of the second portion.