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: |
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| • 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. | ||
7. | Slide the feeler gauge between the rocker arm and the | |
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| valve return spring. Measure the clearance between the | Valve Stem |
| valve stem and rocker arm (Fig. 38). Measure both the | |
| intake and exhaust valves. |
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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
10. | Check the spark plug and reinstall. See Replacing the |
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| Spark Plug. |
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11. | Replace the spark plug wire. |
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12. | Reinstall the engine cover. Check alignment of the cover |
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| before tightening the screws. Tighten screws. | 0.025 in. |
REPLACING THE SPARK PLUG | (0.635 mm.) |
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Use a replacement part number |
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correct air gap is 0.025 in. (0.635 mm.). Remove the plug after |
| Fig. 40 |
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every 25 hours of operation and check its condition. |
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1. | Stop the engine and allow it to cool. Remove the six (6) screws on the back of the engine cover |
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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 |
| ENGINE WILL NOT START |
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| CAUSE | ACTION | |
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| Empty fuel tank | Fill fuel tank with fuel | |
| Primer bulb wasn't pressed enough | Press primer bulb fully and slowly 10 times | |
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| Old fuel | Drain gas tank and add fresh fuel | |
| Fouled spark plug | Replace or clean the spark plug | |
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| Plugged spark arrestor | Clean or replace spark arrestor | |
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| ENGINE WILL NOT IDLE |
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| CAUSE | ACTION | |
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| Air filter is plugged | Replace or clean the air filter |
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| Old fuel | Drain gas tank and add fresh fuel | |
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| Improper carburetor adjustment | Adjust according to the Carburetor Adjustments |
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| section or take to an authorized service dealer |
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| for an adjustment |
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| ENGINE WILL NOT ACCELERATE |
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| CAUSE | ACTION | |
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| Old fuel | Drain gas tank and add fresh fuel | |
| Cutting attachment bound with grass | Stop the engine and clean the cutting attachment | |
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| Dirty air filter | Clean or replace the air filter | |
| Plugged spark arrestor | Clean or replace spark arrestor | |
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| ENGINE LACKS POWER OR STALLS WHEN CUTTING | ||
| CAUSE | ACTION | |
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| Old fuel | Drain gas tank and add fresh fuel | |
| Fouled spark plug | Replace or clean the spark plug | |
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| Plugged spark arrestor | Clean or replace spark arrestor | |
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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 | |||
| snug. | Muffler | Spark Arrestor | |
If using a torque wrench torque to: | ||||
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| Screen | |||
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| Diverter | |||
Do not over tighten. |
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SPARK ARRESTOR MAINTENANCE |
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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. |
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| Screw | ||
2. | With a flat blade screwdriver or Torx |
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| remove the screws attaching the spark arrestor cover to the |
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| muffler (Fig. 41). | Slot | |
3. | Pull the tab on the spark arrestor cover out of the muffler. |
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Remove the spark arrestor cover. |
| Fig. 41 |
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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.
CLEANINGWARNING: 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,
•Store the unit out of the reach of children.
LONG TERM STORAGE1.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.
| CAUSE | ACTION |
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| Oil, cleaner or lubricant in cutting head | Clean and thoroughly dry the cutting head |
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Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Shaft Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube
*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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