{
  "$type": "site.standard.document",
  "description": "An apparatus (10) for adjusting the air-fuel ratio of a fuel mixture to be supplied to an engine. The apparatus (10) has a needle valve body (18) and a receptacle (12) formed in a main body of a carburetor which receives the needle valve body. The needle valve body (18) has a needle and a head…",
  "path": "/patents/1090377",
  "publishedAt": "2004-01-14T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02M19/04",
    "WALBRO ENGINE MANAGEMENT LLC [US]"
  ],
  "textContent": "An apparatus (10) for adjusting the air-fuel ratio of a fuel mixture to be supplied to an engine. The apparatus (10) has a needle valve body (18) and a receptacle (12) formed in a main body of a carburetor which receives the needle valve body. The needle valve body (18) has a needle and a head (28). The needle is axially movable relative to a needle orifice (34). The needle may be axially advanced and retracted by rotating the needle valve body (18) within the receptacle (12) to respectively decrease and increase the flow of the fuel mixture around the needle and through the orifice (34). To prevent tampering with the needle valve body setting, the head (28) of the needle valve body has an unconventional shape requiring a specialized tool to rotatably adjust the needle valve body (18). To further prevent tampering, the head is recessed with the main body of the carburetor. A generally annular retainer (46) is disposed concentrically on the needle valve body and laterally biases the needle valve body into engagement with the receptacle to maintain alignment of the needle valve body (18) relative to the receptacle (12). The retainer (46) assures that a constant fuel calibration setting is maintained through the orifice (34) by resisting needle displacement due to such factors as external forces applied to the head (28) of the needle valve body (18) or engine vibration.",
  "title": "Carburetor air-fuel mixture adjustment assembly"
}