MAINTENANCE

ADJUSTING THE IDLE SPEED

NOTE: Careless adjustments can seriously damage the unit. A qualified service dealer should make carburetor adjustments.

WARNING: The cutting head may spin during idle speed adjustments. 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. Refer to Starting and Stopping.

Idle Speed Screw

2.Release the throttle control and let the engine idle. If the engine stops, use a small Phillips screwdriver to turn the idle speed screw clockwise, 1/8 of a turn at a time

(as needed) until the engine idles smoothly (Fig. 24).

3. If the engine is idling too quickly, turn the idle speed screw counterclockwise, 1/8 of a turn at a time (as needed) to reduce the idle speed (Fig. 24).

Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve most engine problems. If not, and any of the following conditions are true, take the unit to a qualified service dealer:

• the engine will not idle

Fig. 24

 

•the engine hesitates or stalls on acceleration

•there is a loss of engine power

MAINTAINING THE SPARK PLUG

1.Stop the engine and allow it to cool. Grasp the spark plug boot firmly and pull it from the spark plug.

2.Clean around the spark plug. Remove the spark plug from the cylinder head with a 5/8-inch socket, turning counterclockwise.

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

3.

Inspect the spark plug. If the spark plug is cracked, fouled or dirty, replace it with

 

 

 

 

 

 

 

 

 

 

 

 

a replacement part #753-06193, a Champion RDJ7J or an equivalent spark plug.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.

Use a feeler gauge to set the air gap at 0.025 in. (0.635 mm) (Fig. 25).

 

0.025 in.

 

 

 

 

 

 

 

 

 

(0.635 mm)

 

 

 

 

 

 

 

 

5.

Install the spark plug in the cylinder head. Tighten the spark plug with a 5/8-inch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

socket, turning it clockwise until snug.

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 25

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE:

If using a torque wrench, torque to:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

110-120 in.•lb. (12.3-13.5 N•m). Do not over tighten.

 

 

 

 

 

 

 

 

 

 

 

6.

Reattach the spark plug boot.

 

 

 

 

 

 

 

 

 

 

 

CLEANING AND STORAGE

CLEANING

WARNING: To avoid serious personal injury, always stop the engine and allow it to cool before cleaning or maintaining the unit.

Use a small brush to clean 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. Wipe off any moisture with a soft cloth.

STORAGE

•Never store a fueled unit 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.

Short-term Storage (1-2 weeks)

1.Store the unit in a horizontal position. If this is not possible, store the unit vertically with the engine at the top.

Long-term Storage

1.Remove the fuel cap, tip the unit and drain the fuel into an approved container.

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

3.Allow the engine to cool. Remove the spark plug and put 5 drops of any high quality motor oil or 2-cycle oil into the cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.

4.Thoroughly clean the unit and inspect it for any loose or damaged parts. Repair or replace damaged parts and tighten loose screws, nuts or bolts.

Preparing the Unit for Use after Long-term Storage

1. Remove the spark plug and drain all of the oil from the cylinder.

NOTE: Do not use fuel that has been stored for more than 30 days. Dispose of old fuel according to federal, state and local regulations.

TROUBLESHOOTING

PROBLEM

SOLUTION

 

 

THE ENGINE WILL NOT START

 

 

 

The fuel tank is empty

Fill the fuel tank with properly mixed fuel

The primer bulb was not pressed enough

Press the primer bulb 10 times or until fuel is visible

 

 

The engine is flooded

Move the choke lever to Position 3, squeeze the throttle

control and pull the starter rope

 

The fuel is old (over 30 days) and/or improperly mixed

Drain the fuel tank and add fresh, properly mixed fuel

 

 

The spark plug is fouled

Replace the spark plug

 

 

THE ENGINE WILL NOT IDLE

 

 

 

The air filter is dirty

Clean or replace the air filter

The fuel is old (over 30 days) and/or improperly mixed

Drain the fuel tank and add fresh, properly mixed fuel

 

 

The idle speed is incorrect

Adjust the idle speed

 

 

THE ENGINE WILL NOT ACCELERATE

 

 

 

The fuel is old (over 30 days) and/or improperly mixed

Drain the fuel tank and add fresh, properly mixed fuel

The cutting head is bound with grass

Stop the engine and clean the cutting head

 

 

The air filter is dirty

Clean or replace the air filter

 

 

THE ENGINE LACKS POWER OR STALLS WHEN CUTTING

 

 

The fuel is old (over 30 days) and/or improperly mixed

Drain the fuel tank and add fresh, properly mixed fuel

The air filter is dirty

Clean or replace the air filter

 

 

The spark plug is fouled

Replace the spark plug

 

 

ENGINE STOPS WHILE IN USE

 

 

 

Engine overspeed protection engaged

Allow the engine to cool down for 10 minutes before

restarting.

 

 

 

THE CUTTING HEAD WILL NOT ADVANCE LINE

 

 

 

The cutting head is bound with grass

Stop the engine and clean the cutting head

The cutting head is out of line

Refill the cutting head with new line

 

 

The inner reel is bound up

Rewind the line

The cutting head is dirty

Clean the inner reel and outer spool

 

 

The line is welded

Open the cutting head and remove the welded section

The line is twisted

Rewind the line

 

 

Not enough line is extended

Stop the unit, push the bump knob and pull the line until 4

inches (102 mm) is outside of the cutting head

 

 

 

THE CUTTING LINE ADVANCES UNCONTROLLABLY

 

 

There is oil, cleaner or lubricant in the cutting head

Clean and thoroughly dry the cutting head

 

 

IF FURTHER ASSISTANCE IS REQUIRED, CONTACT AN AUTHORIZED SERVICE DEALER.

SPECIFICATIONS*

Engine Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 cc Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,300+ rpm Idle Speed RPM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800 - 3,400 rpm Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 in. (0.635 mm) Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel/Oil Mixture Fuel/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40:1 Fuel Tank Capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 fl.oz. (296 ml) Total Approximate Unit Weight (without fuel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 11 lbs. (4.5 - 5 kg) Cutting Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Head™ Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.095 in. (2.41 mm) Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 in. (43.18 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.

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