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 adjustment, proceed as follows:

In general, turning the adjusting needles In (clockwise) decreases the supply of

fuel to the engine giving a leaner fuel/air mixture. Turning the adjusting needles out (counterclockwise) Increases the supply of fuel to the engine giving a richer fuel/ air mixture.

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

NOTE: The carburetor on this engine is low emission. It is equipped with an idle fuel adjusting needle with a Ilrniter cap, which allows some adjustment within the limits allowed by the cap. Do not attempt to remove the limiter cap. The limiter cap cannot be removed without breaking the adjusting needle.

1.Be sure you have a clean air filter and the throttle control cable is adjusted properly (see above).

2.Start engine and atlow to warm for five minutes. Make adjustments with engine running and shift]motion control lever in neutral (N) position.

3.idle soeed setting - With throttle control lever in slow position, engine should idle at 1750 RPM. If engine idles too slow or fast, turn idle speed adjusting screw in or out until correct idle is attained.

4.Idle fuel needle setting - With throttle control lever in slow position, turn idle fuel adjustment needle In (clockwise) until engine begins to die and then turn out (counterclockwise) until engine runs rough. Turn needle to a point midway between those two positions.

5.Recheck idle speed. Readjust if necessary.

ACCELERATION TEST -

6. Move throttle control lever from slow to

fast position. If engine hesitates or dies, turn idle fuel adjusting needle out (counterclockwise) 1/8 turn.

Repeat test and continue to adjust, if necessary, 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-governedhigh speed needs adjusting, contact a Sears or other qualified service center, which has proper equipment and experience to make any necessary adjustments.

Idle Speed

Screw

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IdleFuel

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Craftsman 410, 272 owner manual To Adjust Carburetor, Acceleration Test
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272, 410 specifications

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