Servicing The Spark Plug; Lubricating The Gear Case; Adjusting The Blade Brake Cable - Exmark Metro 21 Operator's Manual

11. Wipe up any spilled oil.
12. Connect the wire to the spark plug.
13. Recycle the used oil according to local codes.

Servicing the Spark Plug

Check the spark plug after every 100 operating hours or
yearly; replace it after every 250 operating hours or every
)
2 years. Use an NGK BPR5ES or Nippondenso
W16EPR-U spark plug or equivalent.
1. Stop the engine and wait for all moving parts to stop.
2. Disconnect the wire from the spark plug (Fig. 6).
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)
(Fig. 25).
Figure 25
1. 0.030 in. (0.76 mm)
6. Carefully install the spark plug by hand (to avoid cross
threading) until it is hand tight.
7. Tighten the spark plug an additional 1/2 turn if it is
new; otherwise, tighten it an additional 1/8 to 1/4 turn.
Important A loose spark plug can become very hot
and can damage the engine; overtightening a spark plug
may damage the threads in the cylinder head.
8. Connect the wire to the spark plug.

Lubricating the Gear Case

Self-propel Model only
After every 100 operating hours, grease the gear case.
1. Remove the grass bag.
2. Install a grease gun onto the fitting through the belt
cover opening (Fig. 26).
)
1. Belt cover
3. Gently apply one to two pumps of #2 multi-purpose
lithium-base grease.
4. Install the grass bag.
Adjusting the Blade Brake
Cable
m-110
Whenever you install a new blade brake cable assembly,
adjust it.
1. Stop the engine and wait for all moving parts to stop.
2. Disconnect the wire from the spark plug (Fig. 6).
3. Check the adjustment of the cable by moving the
control bar toward the handle until you remove the
slack in the cable. The gap between the brake lever
and the handle must be between 3/16 and 1/4 in.
(5 and 6 mm). To adjust the cable, go to step 4.
20
m-224
Figure 26
2. Grease fitting