Fig. 39

MAINTENANCE AND REPAIR INSTRUCTIONS

6.

Pull the starter rope slowly to bring the piston to the top of

Adjusting Nut

Rocker Arm

 

its travel, (known as top dead center). Check that:

 

 

 

• The piston is at the top of its travel while looking in the

 

Feeler

 

spark plug hole (Fig. 37).

 

Gauge

Both rocker arms move freely, and both valves are closed.

If these statements are not true, repeat this step.

0.003–0.006 in.

7.

Slide the feeler gauge between the rocker arm and the

(0.076–0.152 mm)

 

 

valve return spring. Measure the clearance between the

Valve Stem

 

valve stem and rocker arm (Fig. 38). Measure both the

 

intake and exhaust valves.

 

The recommended clearance for both intake and exhaust is .003 –

.006 in. (.076 – 0.152 mm). Use a standard automotive .005 in. (0.127 mm) feeler gauge. The feeler gauge should slide between the rocker arm and valve stem with a slight amount of resistance, without binding. See Figures 38 and 39.

8.If the clearance is not within specification:

a.Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 39).

To increase clearance, turn the adjusting nut counterclockwise.

To decrease clearance, turn the adjusting nut clockwise.

b.Recheck both clearances, and adjust as necessary.

9.Reinstall the rocker arm cover using a new gasket. Torque the screw to 20–30 in•lb (2.2–3.4 N•m).

10.

Check the spark plug and reinstall. See Replacing the

 

 

Spark Plug.

 

11.

Replace the spark plug wire.

 

12.

Reinstall the engine cover. Check alignment of the cover

 

 

before tightening the screws. Tighten screws.

0.025 in.

REPLACING THE SPARK PLUG

(0.635 mm.)

 

 

 

Use a replacement part number 753-05255 spark plug. The

 

 

 

 

 

correct air gap is 0.025 in. (0.635 mm.). Remove the plug after

 

Fig. 40

 

 

 

 

 

every 25 hours of operation and check its condition.

 

 

 

 

 

1.

Stop the engine and allow it to cool. Remove the six (6) screws on the back of the engine cover

 

with a Flat-head or T-25 Torx screwdriver (Fig. 40).

2.

Grasp the plug wire firmly and pull the cap from the spark plug.

3.

Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a

TROUBLESHOOTING

 

ENGINE WILL NOT START

 

 

 

CAUSEACTION

 

 

 

 

 

Empty fuel tank

Fill fuel tank with fuel

 

Primer bulb wasn't pressed enough

Press primer bulb fully and slowly 10 times

 

 

 

 

 

Old fuel

Drain gas tank and add fresh fuel

 

Fouled spark plug

Replace or clean the spark plug

 

 

 

 

 

Plugged spark arrestor

Clean or replace spark arrestor

 

 

 

 

 

ENGINE WILL NOT IDLE

 

 

 

CAUSE

ACTION

 

 

 

 

 

Air filter is plugged

Replace or clean the air filter

 

 

Old fuel

Drain gas tank and add fresh fuel

 

 

 

 

Improper carburetor adjustment

Adjust according to the Carburetor Adjustments

 

 

section or take to an authorized service dealer

 

 

 

for an adjustment

 

 

 

 

 

 

ENGINE WILL NOT ACCELERATE

 

 

 

CAUSE

ACTION

 

 

 

 

 

Old fuel

Drain gas tank and add fresh fuel

 

Cutting attachment bound with grass

Stop the engine and clean the cutting attachment

 

 

 

 

 

Dirty air filter

Clean or replace the air filter

 

Plugged spark arrestor

Clean or replace spark arrestor

 

 

 

 

ENGINE LACKS POWER OR STALLS WHEN CUTTING

 

CAUSE

ACTION

 

 

 

 

 

Old fuel

Drain gas tank and add fresh fuel

 

Fouled spark plug

Replace or clean the spark plug

 

 

 

 

 

Plugged spark arrestor

Clean or replace spark arrestor

 

 

 

 

CUTTING ATTACHMENT WILL NOT ADVANCE LINE

5/8 in. socket counterclockwise.

WARNING: Do not sand blast, scrape or clean electrodes. Grit in the engine could damage the cylinder.

4. Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.635 mm.) using a feeler gauge (Fig. 40).

5.

Install a correctly-gapped spark plug in the cylinder head. Turn the 5/8 in. socket clockwise until

 

snug.

Muffler

Spark Arrestor

If using a torque wrench torque to:

 

 

Screen

110-120 in.•lb. (12.3-13.5 N•m)

 

 

Diverter

Do not over tighten.

 

SPARK ARRESTOR MAINTENANCE

 

 

CAUSE

Cutting attachment bound with grass

Cutting attachment out of line Inner reel bound up Cutting head dirty

Line welded

Line twisted when refilled

Not enough line is exposed

ACTION

Stop the engine and clean cutting attachment

Refill with new line

Replace the inner reel

Clean inner reel and outer spool

Disassemble, remove the welded section and rewind

Disassemble and rewind the line

Push the bump head and pull out line until 4 inches (102 mm) of line is outside of the cutting attachment

1.

Remove the rear engine cover. See Rocker Arm Clearance.

 

T-25

 

Screw

2.

With a flat blade screwdriver or Torx T-20 bit and a T-25 bit,

 

 

 

remove the screws attaching the spark arrestor cover to the

 

 

 

muffler (Fig. 41).

Slot

T-20 Screw

3.

Pull the tab on the spark arrestor cover out of the muffler.

 

 

 

Remove the spark arrestor cover.

 

Fig. 41

 

 

 

4.Remove the spark arrestor screen from the spark arrestor cover.

5.Clean the spark arrestor screen with a wire brush or replace it.

6.Reinstall the spark arrestor screen, spark arrestor cover and screws.

CLEANING

WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool before you clean or service it.

Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off any moisture with a soft cloth.

STORAGE

Never store the unit with fuel in the tank where fumes may reach an open flame or spark.

Allow the engine to cool before storing.

Lock up the unit to prevent unauthorized use or damage.

Store the unit in a dry, well-ventilated area.

Store the unit out of the reach of children.

LONG TERM STORAGE

1.Drain all gasoline from the gas tank into a container. Do not use gas that has been stored for more than 60 days. Dispose of the old gasoline in accordance to Federal, State, and Local regulations.

2.Start the engine and allow it to run until it stalls. This ensures that all gasoline has been drained from the carburetor.

3.Allow the engine to cool. Remove the spark plug and put 5 drops of high quality motor oil into the cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.

NOTE: Remove the spark plug and drain all of the oil from the cylinder before attempting to start the trimmer after storage.

4.Change the oil, referring to Changing the Oil. Dispose of the old oil in accordance to Federal, State and Local regulations.

5.Thoroughly clean the unit and inspect for any loose or damaged parts. Repair or replace damaged parts and tighten loose screws, nuts or bolts. The unit is ready for storage.

TRANSPORTING

Allow the engine to cool before transporting.

Secure the unit while transporting.

Drain the gas tank before transporting.

Tighten gas cap before transporting.

CUTTING LINE ADVANCES UNCONTROLLABLY

 

CAUSE

ACTION

 

 

 

 

 

 

Oil, cleaner or lubricant in cutting head

Clean and thoroughly dry the cutting head

 

 

 

 

 

If further assistance is required, contact your authorized service dealer.SPECIFICATIONSENGINE*

Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 4-Cycle Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 cu. in. (29 cc) Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,800+ rpm Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800 - 3,600 rpm Ignition Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rocker Switch Valve clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.003–0.006 in. (0.076–0.152 mm) Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 inch (0.635 mm) Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAE 30 Oil Crankcase Oil Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.04 oz (90 ml) Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unleaded Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diaphragm, All-Position Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto Rewind Muffler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baffled with Guard Throttle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Spring Return Fuel Tank Capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 oz (414 ml)

DRIVE SHAFT AND CUTTING ATTACHMENT*

Drive Shaft Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube (EZ-Link™) Throttle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger Approximate Unit Weight (No fuel, with handle, cutting attachment and shield) 11.5-13.0 lbs (5.2-5.9 kg) Cutting Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SpeedSpool 2® Line Spool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Line Releaser Line Spool Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 inches (101.6 mm) Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .095 inches (2.41 mm) Cutting Path Diameter, Trimmer Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 inches (43.2 cm)

*All specifications are based on the latest product information available at the time of printing. We reserve the right to make changes at any time without notice.

7