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Page 2 CARTER CARBURETOR CORPORATION, ST. LOUIS, MO., U. S.
A.
25-42S
25-1555
BEND HERE FOR FLOAT DROP
BEND HERE TO ADJUST LEVEL
21-705 EARLY PRODUCTFON
BEND HERE FOR FLOAT DROP BEND HERE TO ADJUST LEVEL
2 1-8 6 S LATE PRODUC T I O N
Figure 1 FLOAT LEVEL:
Early Production: 622S Carbureters use 21-70S float and lever assembly and
must be used with 25-42S needle and seat assembly (Fig 1). Adjust float 3/8" from
machined portion on bowl cover to seam of float (T109-80) (Fig. 2).
Late Production: 622SA Carbureters use 21-86S float and lever assembly and
must be used with 25-155S needle and seat assembly (Fig. 1). Adjust float
1/" from machined portion on bowl cover to seam of float (T109-83) (Fig.
2).
To convert 622S to 622SA, unitized package 21-101U can be used (consists
of 25-155S needle and seat assembly and 21-86S float and lever assembly).
Figure 2
Pump Adjustment: Must be made before metering rod adjustment. With throttle
valve seated and pump connector link in lower hole (medium stroke), pump
plunger should travel 18/64" from seated to wide open throttle position.
Pump travel can be measured by using universal pump stroke gauge, T109-117S,
placing base of gauge on ridged portion of bowl cover so that finger of gauge
is over top of pump connector link where it extends through plunger shaft,
(B—Figure 3). Hold gauge vertical and turn knurled nut of gauge until
finger lightly touches top of connector link. Take gauge reading. Difference
in readings obtained at wide open and seated throttle positions should be "18".
Adjustment can be made by bending throttle connector rod at lower angle.
(Insert. Figure 3.)
Figure 3
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