Servicing The Spark Plug - Lawn-Boy 22270 Operator's Manual

4. Slowly pour oil into the oil fill tube, periodically
checking the level with the dipstick, until the dipstick
indicates that the engine is full as illustrated in
Figure 40. Do not overfill. (Max. fill: 20 oz. (0.55
l), type: SAE 30W detergent oil with an API service
classification of SH, SJ, SL, or higher.)
Note: If you overfill the engine, pour some oil out
of it.
5. Install the dipstick securely.
6. Dispose of the used oil properly at a local recycling
center.

Servicing the Spark Plug

Service Interval: Every 100 hours
Every 200 hours
Use an NGK BPR6ES spark plug or equivalent.
1. Stop the engine and wait for all moving parts to stop.
2. Disconnect the wire from the spark plug (Figure 36).
3. Clean around the spark plug.
4. Remove the spark plug from the cylinder head.
Important: Replace a cracked, fouled, or
dirty spark plug. Do not clean the electrodes
because grit entering the cylinder can damage
the engine.
5. Set the gap on the plug to 0.030 in. (0.76 mm)
(Figure 42).
Figure 41
2
1
G000533
1. Center electrode insulator
2. Side electrode
3. Air gap (not to scale)
6. Install the spark plug and the gasket seal by hand.
7. Tighten the plug 1/2 turn after the spark plug seats
to compress the washer.
Note: When installing the original spark plug again,
tighten 1/8 to 1/4 turn after the spark plug seats
to compress the washer.
Note: Under-tightening the spark plug can cause
the plug to become very hot and can damage the
engine. Overtightening the spark plug can damage
the threads in the engine cylinder head.
8. Connect the wire to the spark plug.
21
3
0.030 inch
(0.76 mm)
Figure 42