Yard Machines MTD1640NAVCC, MTD1840AVCC Spark Plug, Carburetor Adjustment, Storing A Chain Saw

7 - MAINTENANCE INSTRUCTIONS

7-5.SPARK PLUG

NOTE: For efficient operation of saw engine, spark plug must be kept clean and properly gapped.

1.Push STOP switch down.

2.Remove air cleaner cover.

3.Disconnect the wire connector (G) from the spark plug

(H) by pulling and twisting at the same time (Figure 7- 5A).

4.Remove spark plug with spark plug socket wrench.

DO NOT USE ANY OTHER TOOL.

5.Check electrode gaps with wire feeler gauge and set gaps to .025” (.635mm) if necessary.

6.Reinstall a new spark plug.

NOTE: A resistor spark plug must be used for replacement (MTD part no. 9295-310502, Champion RZ7C).

NOTE: This spark ignition system meets all requirements of the Canadian Interference-Causing Equipment Regulations.

G

H

7-5A

7-6.CARBURETOR ADJUSTMENT

The carburetor was pre-set at the factory for optimum per- formance. If further adjustments are necessary, please take your unit to the nearest Authorized Service Center listed in the Yellow Pages.

7-7.STORING A CHAIN SAW

CAUTION

Never store a chain saw for longer than 30 days without performing the following procedures.

Storing a chain saw for longer than 30 days requires stor- age maintenance. Unless the storage instructions are fol- lowed, fuel remaining in the carburetor will evaporate, leav- ing gum-like deposits. This could lead to difficult starting and result in costly repairs.

1.Remove the fuel tank cap slowly to release any pres- sure in tank. Carefully drain the fuel tank.

2.Start the engine and let it run until the unit stops to remove fuel from carburetor.

3.Allow the engine to cool (approx. 5 minutes).

4.Using a spark plug wrench, remove the spark plug.

5.Pour 1 teaspoon of clean 2-cycle oil into the combus- tion chamber. Pull starter rope slowly several times to coat internal components. Replace spark plug (Figure 7-7A).

NOTE: Store the unit in a dry place and away from possi- ble sources of ignition such as a furnace, gas hot water heater, gas dryer, etc.

7-7A

7-8.REMOVING A UNIT FROM STORAGE

1.Remove spark plug.

2.Pull starter rope briskly to clear excess oil from com- bustion chamber.

3.Clean and gap spark plug or install a new spark plug with proper gap.

4.Prepare unit for operation.

5.Fill fuel tank with proper fuel / oil mixture. See Fuel and Lubrication Section.

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