Specifications

3
NOTE: SPECIFICATION TABLES BEGIN ON PAGE 63 OF THIS SECTION.
50
CROSS-OVER FLO-JET HORIZONTAL
CRANKSHAFT ENGINES
The cross-over Flo-Jet carburetor is used on Model
Series 253400, 255400 engines and is a float type
carburetor with idle circuit and main jet adjustment
needles. This carburetor also has an integral fuel
pump. All adjustments can be made from top of
carburetor, Figs. 127 and 128.
Fig. 127
Main jet needle valve (1)
Idle needle valve (2)
Idle speed adjustment (3)
Throttle lever (4)
Disassemble Cross-Over Flo-Jet (Fig. 128)
Fig. 128 (Sectional view)
Main jet needle valve (1)
Venturi (2)
Choke plate (3)
Float (4)
Main emulsion tube (5)
Float bowl nut (6)
Float bowl (7)
Throttle plate (8)
Idle mixture needle (9)
1. Remove idle and main jet adjustment needle
valves.
2. Remove float bowl mounting screw, washer and
float bowl.
3. Using a large blunt screwdriver, remove emulsion
tube.
4. Use screwdriver to remove two screws from choke
shaft.
5. Use screwdriver to remove screw from throttle
shaft.
6. Remove throttle plate and throttle shaft.
7. Remove fuel pump from carburetor taking care not
to lose pump flapper valve springs.
8. Use screwdriver to remove three screws from fuel
pump body.
Fig. 127
3
2
1
4
5
Fig. 128
3
2
1
4
7
6
5
8
9
Disassemble Carburetor
Small One-Piece Flo-Jet
1. Remove idle (2) and main jet needle valves (1),
Fig. 129.
2. Remove bowl nut (7) and fuel bowl (8).
3. Remove float pin to remove float and inlet needle
4. Use a large wide screwdriver to remove inlet valve
seat.
Fig. 129
Throttle plate (3)
Gaskets (4)
Float (5)
Emulsion tube (6)
Choke plate (9)
Venturi (10)
Fig. 129
7
6
5
4
3
2
1
4
8
9
10