carburetor adiustment

CAUT ION: WHEN FOLLOWING STEPS 1 THRU 5 BELOW, USE EXTREME CARE TO AVOID CONTACT WITH MUFFLER, HEAT SHIELD OR MOVING PARTS TO PREVENT INJURY. ALSO, BELT GUARD MUST BE IN PLACE.

MAIN FUEL AND IDLE VALVE ADJUSTMENT

 

MAIN FUEL

LOW SPEED SET

(HIGH SPEED)

ON GOVERNOR

ADJUSTMENT

LlNKAGE- SMALL

 

GAP HERE AT NO

 

LOAD

 

THROTTLE

IDLE

STOP

ADJUSTMENT

SCREW

 

SIDE VIEW

REAR VIEW

spark

SPARK PLUG GAP 0.025" GASOLINE

FIG. 23

SPARK PLUGS: Check, clean and reset spark plugs every 100 operating hours. Replace spark plugs that show signs of fouling or electrode erosion .

.025

(cold)

FIG.21INITIAL ADJUSTMENT:

The carburetor has a main fuel valve adiusting screw and an idle valve adjusting screw. (Fig. 21). A low speed adjustment screw is shown in (Fig. 22).

1.Turn main fuel valve clockwise until it just closes.

CAUTION: Valves may be damaged by turning then in too far.

2.Now open main fuel valve 1 turn counterclockwise.

3.Close idle valve in same manner and open it 5/8 turn (counterclockwise).

4.Thi s initial adjustment wi II permit engine to start and warm up prior to final adjustment.

FINAL ADJUSTMENT

BREAKER POINTS: Check, clean and reset breaker points every 200 operating hours. Replace points if they are pitted or burned. Set point gap to .025 cold when fu Ily open.

tire s

air pressure in

another free manual from www.searstractormanuals.com

1.Turn main fuel valve in until engine misses (lean

mixture), than turn it out past the point where en·

tires.

~ine

runs smoothly until engine runs unevenly

 

(rich

mixture). Turn valve to mid·point between

G--'-+-'--11

Iean and ri ch so eng i ne runs smooth Iy.

 

2.Hold engine at idle position and set low speed adjustment screw (Fig. 22) until a fast idle is obtained (1200 rpm).

3.Hold throttle in idle position and turn idle adjust· ment valve in (lean) and out (rich) until engine idles smoothly.

4.Reset low speed adjustment screw so engine idles at 1200 rpm.

5.Re lease thrott le·engine shou Id acce lerate without hesitation. If engine does not accelerate properly,

readjust main fuel valve by turning out slightly.

To remoy.£, a front tire and wheel, proceed as fol·

IMPORT ANT: Do not open more than Y2 turn be-

lows:

 

1. Block up Tractor rocker bar (front axle) securely

yond maximum power point.

or use a Sears Tractor Jack.

LOW SPEED ADJUSl MENT

2. Remove hex bolt (A), and dust cap (8).

0©J~===-=Q.m.........-

3. Remove gripco nut (C), wear washer (D), pin

 

 

 

 

(E), and washer (F), from spindle shaft as·

o

1__

sembly (G).

4. After tire is repaired, reverse above procedure

 

 

-

SET LOW SPEED ADJUSTMENT

for

reassembly.

 

SO ENGINE RUNS AT 1200 RPM

A rear

whee I and tire is removed by remov i ng the

 

IN "SLOW" POSITION.

 

~

five hub bolts from wheel and hub. FI RST: Block

 

 

 

 

up rear axle securely or use a Sears Tractor Jack.

 

 

Sears or your local service station can repair your

 

 

Tractor tire in the same manner as an automobile

4824R·7. 1.74

FIG. 22

• 12. tire.