MTD 1425NAV, 1842AVCC, 1642AVCC manual Spark Arrester Screen, Spark Plug, Carburetor Adjustment

MAINTENANCE AND REPAIR INSTRUCTIONS

SPARK ARRESTER SCREEN

NOTE: A clogged spark arrester screen will dramatically reduce engine performance.

1.Remove the 3 bolts (A) and pull muffler out. (Fig. 28).

2.Remove the 2 screws (B) that hold the spark arrester cover (C) (Fig. 29).

3.Discard the used spark arrester screen (D) and replace it with a new one.

4.Reasemble the muffler components and install the muffler to the cylinder. Tighten securely.

A

Fig. 28

A

B

C

D

Fig. 29

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 (Fig. 30).

4.Remove spark plug with spark plug socket wrench.

DO NOT USE ANY OTHER TOOL.

WARNING: Do not sand blast, scrape or clean

electrodes. Grit in the engine could damage the cylinder.

5.Check electtrode 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 (part no. 9295-310502).

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

H

G

Fig. 30

CARBURETOR ADJUSTMENT

The carburetor was pre-set at the factory for optimum performance. If further adjustments are necessary, please take your unit to the nearest Authorized Service Center listed in the Yellow Pages. Call 1-800-345-8746 for more information.

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