Yard-man YM26SS User Manual download pdf (Page 21)

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable. An idle

adjustment screw is reached though a hole in the top of

the engine cover (Fig 37).

NOTE: Careless adjustments can seriously damage your

unit. An authorized service dealer should make

carburetor adjustments.

Check Fuel

Old fuel is usually the main reason for the unit not

running properly. Drain and refill the tank with clean,

fresh unleaded fuel prior to doing any adjustments. Refer

to the Oil and Fuel Information section.

3. If the cutting attachment rotates when the engine

idles, turn the idle speed screw counterclockwise 1/8

of a turn at a time (as needed), to reduce idle speed.

Checking the fuel, 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 Adjustment Screw

Fig. 37

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

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 screw. Refer to

Air Filter Maintenance in the Maintenance and Repair

Instructions section.

Adjust Idle Speed Screw

WARNING: The cutting attachment may be

spinning during idle speed adjustment. Wear

protective clothing and observe all safety

instructions to prevent serious personal injury.

If after checking the fuel 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 at a high idle for a

minute to warm up.

2. Release the throttle trigger and let the engine idle. If

the engine stops, insert a small phillips or flat blade

screwdriver into the hole in the engine cover

(Fig. 37). Turn the idle speed screw in, clockwise,

1/8 of a turn at a time (as needed) until the engine

idles smoothly.

NOTE: The cutting attachment should not rotate when

the engine idles.

Fig. 36

Back Plate Slot

Slots

Choke Lever

7. Reinstall the air filter cover. Position the hooks on

the left side of the air filter cover into the slots at the

left side of the back plate (Fig. 36).

NOTE: It may be necessary to remove the fuel cap to

reinstall the air filter cover

8. Swing the cover to the right until the tab on the air

filter cover snaps into place in the slot on the back

plate (Fig. 36).

9. Replace the fuel cap, if removed.

Back Plate

Fig. 35

5. Squeeze the filter to spread and remove excess oil

(Fig. 36).

6. Replace the filter (Fig. 35).

NOTE: If the unit is operated without the air filter, you

will VOID the warranty.

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Yard-man YM26SS User Manual Page 21

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