Spark Plug - Toro Z-Master 250 Series Operator's Manual

Maintenance

Spark Plug

Check the spark plug(s) after every 200 operating
hours. Make sure the air gap between the center and
side electrodes is correct before installing the spark
plug. Use a spark plug wrench for removing and
installing the spark plug(s) and a gapping tool/feeler
gauge to check and adjust the air gap. Install a new
spark plug(s) if necessary.
Type: Champion RC12YC (or equivalent) Air Gap:
0.030 in. (0.76 mm)
Removing the Spark Plug
1. Disengage the power take off (PTO) and turn the
ignition key to "OFF" to stop the engine. Move
controllers to neutral locked position and apply
parking brake. Remove the key.
2. Pull the wire(s) off the spark plug(s) (Fig. 27).
Now clean around the spark plug(s) to prevent
dirt from falling into the engine and potentially
causing damage.
3. Remove the spark plug(s) and metal washer.
2
Figure 27
1. Spark plug wire
38
(s)
1
m–3218
2. Spark plug
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 28).
If you see light brown or gray on the insulator,
the engine is operating properly. A black coating
on the insulator usually means the air cleaner is
dirty.
IMPORTANT: Never clean the spark plug(s).
Always replace the spark plug(s) when it has:
a black coating, worn electrodes, an oily film,
or cracks.
2. Check the gap between the center and side
electrodes (Fig. 28). Bend the side electrode
(Fig. 28) if the gap is not correct.
2
1
Figure 28
1. Center electrode insulator
2. Side electrode
Installing the Spark Plug
1. Install the spark plug(s). Make sure the air gap is
set correctly.
2. Tighten the spark plug(s) to 20 ft-lb (27 N.m).
3. Push the wire(s) onto the spark plug(s) (Fig. 27).
3
0.030 in.
(0.76 mm)
m–3215
3. Air gap (not to scale)
(s)