Yard Machines MTD1425NAV Operator's Manual page 17

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
A
Fig. 28
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:
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.
B
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.
17
Do not sand blast,
scrape or clean
H
G
Fig. 30