Yard Machines 41AD-280G000 manual Carburetor Adjustments, Engine Specifications, Unit Weight

SECTION 5: MAKING ADJUSTMENTS

Carburetor Adjustments

WARNING: If any adjustments are made to the engine while the engine is running (e.g. carburetor), keep clear of all moving parts. Be careful of heated surfaces and muffler.

The idle speed adjuster of the engine is adjustable through the air filter/muffler cover. See Figure 13.

NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should make carburetor adjustments.

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason for the unit not running properly. Drain and refill the tank with fresh, properly mixed fuel prior to making any adjustments. Refer to OPERATING YOUR TRIM- MER in Section 4.

Clean Air Filter

The condition of the air filter is important to the operation of the unit. A dirty air filter will restrict air flow and change the air/fuel mixture. This is often mistaken for an out of adjustment carburetor. Check the condition of the air filter before adjusting the idle speed adjuster. Refer to MAINTAINING YOUR TRIMMER in Section 6.

Adjusting Idle Speed

WARNING: This unit will need to be running during idle speed adjustment. Wear protective clothing and observe all safety instructions to prevent serious personal injury.

If after checking the fuel mixture and cleaning the air filter the engine still will not idle, adjust the idle speed screw as follows.

1.Start the engine and let it run about 2-3 minutes at a high idle to warm up. Refer to OPERATING YOUR TRIMMER in Section 4.

2.Release the throttle control and let the engine idle. If the engine stops, insert a small phillips or flat blade screwdriver into the hole in the air fil- ter/muffler cover. Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly. See Figure 13.

3.If the unit appears to be idling too fast, turn the idle speed adjuster counterclockwise 1/8 of a turn at a time (as needed), to reduce idle speed.

NOTE: If a tachometer is available, set idle speed to RPM specifications.

Checking the fuel mixture, cleaning the air filter, and adjusting the idle speed screw should solve most engine problems.

If not and:

•The engine will not idle,

•The engine hesitates or stalls on acceleration,

•There is a loss of engine power,

have the carburetor adjusted by an authorized service dealer.

WARNING: When the unit is turned off make sure the cutting attachment has stopped before the unit is set down to prevent serious personal injury.

Idle Speed Screw

	Figure 13
Engine Specifications
Engine Type	… … … … … … …Air-Cooled, 2-Cycle
Displacement	… … … … … … … … … … … 31cc

Idle Speed R.P.M. … … … … … 3,400-4,400rpm Operating R.P.M. … … … … … … 6,600-8,000rpm Fuel/Oil Mixture Ratio. … … … … … … … … 32:1

Unit Weight

(No fuel, with cutting attachment, cutting

attachment shield and D-handle) … 9.5 lbs. (4.31 kg)

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