Manual

SERVICING YOUR LAWN MOWER

2. Remove the spark plug with a

13/16 in (21 mm) spark plug

wrench.

3. Inspect the spark plug.

Replace it if the electrodes are

worn, or if the insulator is

cracked or chipped.

4. Measure the spark plug

electrode gap with a suitable

gauge. The gap should be 0.028 ~ 0.031 in (0.7 ~ 0.8 mm). Correct

the gap, if necessary, by carefully bending the side electrode.

5. Install the spark plug carefully,

by hand, to avoid

cross-threading.

6. After the spark plug seats,

tighten with a 13/16 in (21 mm)

spark plug wrench to compress

the washer.

If reinstalling the old spark plug,

tighten 1/8 to 1/4 turn after the

spark plug seats.

If installing a new spark plug,

tighten 1/2 turn after the spark

plug seats to compress the washer.

NOTICE

A loose spark plug can overheat and damage the engine.

Overtightening the spark plug can damage the threads in the

cylinder head.

7. Install the spark plug cap on the spark plug.

SPARK PLUG

WRENCH

0.028 ~ 0.031 in

(0.7 ~ 0.8 mm)

SEALING

WASHER