Carburetor air-fuel mixture adjustment assembly and tools

A tool for rotatably adjusting a valve with a head having an exterior cylindrical surface and a pocket in the head with an inner cylindrical surface with the valve received in a receptacle of a carburetor with a passage of the receptacle open to the exterior of the carburetor and the passage having a cylindrical surface with the head received in the passage, the tool comprising:

• a tubular shank;
• at least two collet fingers carried by the shank and each extending generally axially to a free end having a generally circumferentially extending portion and collectively the circumferentially extending portions have an outside diameter smaller than the diameter of the inside cylindrical surface of the pocket of the head of the valve;
• a follower surface on at least a portion of the free end of each finger and tapering generally radially and axially inward relative to the outer circumferential surface portion of its associated finger;
• a cam having a cam surface complementary to and engageable with the follower surfaces of the finger;
• a rod received in the tubular shank and adjacent one end attached to the cam and adjacent another end having a threaded portion extending generally axially outwardly of the tubular shank;
• a knob carrying complementary threads engaged with at least some of the threads of the threaded portion of the rod;
• and
• the knob is rotatable in one direction relative to the rod to move the cam surface into engagement with the followers to move the end portions of the fingers generally radially outward into firm engagement with at least a portion of the inner cylindrical surface of the pocket of the head when the end portion of each finger is received in the pocket of the head so that rotation of the fingers in unison with the cam rotates the valve to adjust an air-to-fuel ratio of an air-fuel mixture supplied by the carburetor to an operating engine, and rotation of the knob relative to the shank in a direction opposite to one direction of rotation of the knob permits the fingers to move generally radially inward to release the fingers from firm engagement with the inner cylindrical surface of the pocket of the valve head so that the fingers can be generally axially removed from the valve head without rotating the valve.

A tool for rotatably adjusting a valve with a head having an exterior cylindrical surface and received in a receptacle of a carburetor with a passage of the receptacle open to the exterior of the carburetor and having a cylindrical surface and the head is received in passage, the tool comprising:

• a shank having a cylindrical threaded portion;
• at least two collet fingers carried by the shank adjacent the threaded portion and each extending generally axially to a free end distal from the threaded portion and at least adjacent the free end having a generally circumferentially extending portion and collectively the circumferentially extending portions have an outside diameter smaller than an inside diameter of the passage of the receptacle;
• an annular collar having internal threads complementary with and engaging the threads of the cylindrical portion of a shank and adjacent one end of the collar, a cam surface inclined to a longitudinal axis of the collar and engageable with a complementary follower surface on an exterior portion of each of the fingers and axially spaced from the ends of the fingers;
• and
• the cam and follower surfaces are configured so that rotation in one direction of the collar relative to the shank moves the cam surface into engagement with the follower surfaces to move portions of an internal surface of each finger adjacent its associated free end into firm engagement with the exterior cylindrical surface of the head of the valve when the end portion of each finger is received between the cylindrical head and the cylindrical surface of the passage of the receptacle so that rotation of the collar and fingers in unison rotates the valve to adjust an air-to-fuel ratio of an air-fuel mixture supplied by the carburetor to an operating engine, and rotation of the collar relative to the shank in a direction opposite to the one direction of rotation retracts the cam surface of the collar relative to the follower surfaces of the fingers to release the fingers from firm engagement with the exterior surface of the valve head so that they can be generally axially removed from the valve head and the passage without rotating the valve.

A tool for rotatably adjusting a valve with a head having a cylindrical surface, the tool comprising:

• a shank having an axis;
• at least two fingers carried by the shank with each finger having a free end with a generally circumferentially extending portion and collectively the circumferentially extending portions define a first diameter in an unflexed state of the fingers;
• a follower surface on at least a portion of each finger;
• a cam having a cam surface engageable with the follower surfaces of the finger, the cam being axially movable relative to the shank so that the cam surfaces engage the follower surfaces and radially flex the fingers to change the size of the first diameter to permit the fingers to selectively frictionally engage the cylindrical surface of the valve head.