Cub Cadet 71 manual Fuelsystem, Carburetoradjustments, too rich. The high speed adjustment screw

FUELSYSTEM

	Illust.	7		Illust.7A
Carburetor	and	fuel strainer.		Carburetor and fuel	strainer.
(International	Cub	Cadet 71 Tractor)	(Internationol	Cub Cadet 102,	122 and 123 Tractors)

CARBURETORADJUSTMENTS

The carburetor is adjusted at the factory and under normal operating conditions it will

not require readjusting. If this adjustment has been disturbed for any reason, proceed as follows:

For a final check of the high speed adjust- ment, operate the engine under load and make

any corrections necessary for smooth opera- tion.

Adjusting the Idle Adjustment Screw

Adjusting the High-Speed Adjustment Screw

Turn the high speed adjustment screw (1IIusts.

7 and 7A) counter-clockwise approximately two

turns from the closed position and start the en-gine.

After the engine has reached normal oper-

ating temperature, accelerate the engine and check its response.

After the high speed adjustment screw is adjusted, it may be necessary to readjust the idle adjustment screw (1IIusts. 7 and 7A), as each affects the other.

Close the idle adjustment screw to its seat by turning it clockwise; then open it one turn. Start the engine and operate it at fast idling speed (without any load) until thoroughly warm.

Place the engine under load and turn the

high speed adjustment screw (1IIusts. 7 and 7A) to the leanest mixture that will allow satisfactory

acceleration and steady governor operation.

If the engine misses and backfires under load, the high speed mixture is too lean. The high speed adjustment screw must be turned counte r- clockwise 1 /4 turn at a time until the condition is corrected.

If the engine shows a sooty exhaust and is sluggish under load, the high speed mixture is

too rich. The high speed adjustment screw

must be turned clockwise 1 /4 turn at a time until the condition is corrected.

While the engine is running at fast idle

speed, it is advisable to screw in the throttle stop sc rew (1IIusts.7 and 7A) a few turns to keep

the engine from stopping when the throttle

lever is moved to the fully retarded "SLOW"

position. The engine will then be idling at a

fairly high speed and the throttle stop screw

can be backed out a little at a time until the

desired idle speed is obtained.

If the engine misses or rolls while backing out the throttle stop screw. the idle adjustment screw may be adjusted in or out until the en-

gine operates smoothly. Speed up the engine for a few seconds; then recheck the idle ad-

justment. A slight adjustment in or out will give the smoothest idle.

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