TO ADJUST CHOKE CONTROL

The choke control has been preset at the factory and adjustment should not be necessary. Check adjustment as de- scribed below before loosening cable. If adjustment is necessary, proceed as follows:

1.With engine not running, move choke control (located on dash panel) to full choke position.

2.Remove air cleaner cover, filter and

cartridge plate to expose carburetor choke (see "AIR FILTER" in the

Maintenance section of this manual).

3.Choke should be closed. If it is not, loosen casing clamp screw and move choke cable until choke is completely closed. Tighten casing clamp screw

securely.

 

4 Reassemble

air cleaner.

Choke

Closed

 

\

Casing

 

Clamp

Choke

Screw \

 

Lever

TO ADJUST CARBURETOR

The carburetor has been preset at the factory and adjustment should not be

necessary. However, minor adjustment may be required to compensate for differences in fuel, temperature, altitude or load. If the carburetor does need adjust- ment, proceed as follows:

In general, turning the mixture screw in (clockwise) decreases the supply of fuel to the engine giving a leaner fuel/air mixture. Turning the mixture screw out

(counterclockwise) increases the supply of fuel to the engine giving a richer fuel/air mixture.

IMPORTANT: Damage to the needles and the seats in carburetor may result if screw is turned in too tight.

PRELIMINARY SETTING -

1.Be sure you have a clean air filter, and the throttle control cable and choke

are adjusted properly (see above).

2.With engine off turn idle mixture screw in (clockwise) closing it finger tight and

then turn out (counterclockwise) 1-1/4 to 1-1/2 turns.

FINAL SETTING

1.Start engine and allow to warm for five minutes. Make final adjustments with engine running and shift/motion control lever in neutral (N) position.

2.With throttle control lever in slow position, hold throttle lever against idle

speed screw and adjust idle speed screw to obtain 1200 to 1400 RPM.

3.While still holding throttle lever against idle speed screw, turn idle mixture screw in (clockwise) until engine begins to die and then turn out (counterclockwise) until engine runs rough. Turn screw to a point midway between those two positions.

4.Continue to hold throttle lever against idle speed screw and adjust idle speed screw to obtain 900 to 1200 RPM. Release throttle lever.

ACCELERATION TEST -

5.Move throttle control lever from slow to fast position. If engine hesitates or dies, turn idle mixture screw out (counterclockwise) 1/8 turn. Repeat

test and continue to adjust, if neces- sary, until engine accelerates smoothly.

High speed stop is factory adjusted. Do not adjust - damage may result.

IMPORTANT; Never tamper with the engine governor, which is factory set for proper engine speed. Overspeeding the engine above the factory high speed setting can be dangerous. If you think the engine-governed high speed needs adjusting, contact a Sears or other qualified service center, which has proper equip- ment and experience to make any necessary adjustments.

ldle Speed

few

Idle Mixture

Screw

Throttle Lever

Idle Speed

Throttle _

_

Idle

Lever _

 

Mixture

 

 

Screw

28

Page 27 Page 29
Page 28
Image 28
Craftsman 917.271815 owner manual To Adjust Choke Control, Preliminary Setting, Final Setting, Acceleration Test
Page 27 Page 29

917.271815 specifications

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