Float adjustment: With throttle body inverted and gasket removed, there should be (the clearance indicated above) between machined surface of throttle body and seam of float. Measure both sides and make them the same.
Idle Adjustment: Set throttle lever adjusting screw until motor runs approximately 400 RPM. Then set idle adjustment screw for highest steady vacuum gauge reading or smoothest engine operation. Correct setting will be found between 1/4 to 1 1/2 turns open.
High Speed Adjustment: With hand throttle wide open and engine operating 2000 RPM (governed speed), adjust high speed adjusting needle until smoothest engine operation is obtained. This setting will be found between 3/4 to 1 1/2 turns open.
Throttle body assembly (997S)
High speed adjusting needle assembly
Throttle body assmelby (2223S)
Throttle and choke valve attaching screw
Throttle shaft and lever assembly
Idle adjustment screw spring
Choke valve assembly
Choke lever spring
Low speed jet
Float lever bracket spring
Body attaching screw and washer assembly
Idle port rivet plug
Throttle adjusting screw
Bowl drain plug
Metering jet 997S, 2709S
Metering jet 2223S, 2402S
Choke shaft & level assembly
High speed needle packing nut
High speed adjusting screw washer
Needle seat gasket
Air horn, choke and throttle shaft dust seal retainer