Toro Field Pro 604 Operator's Manual page 53

Checking the Spark Plug
1. Check the spark plug—if you see light brown
or gray on the insulator, the engine is operating
properly.
Note:
A black coating on the insulator may
mean the air cleaner is dirty.
Important:
Do not 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. Adjust the air gap
center electrode and side electrode to 0.76 mm
(0.030 inch).
Figure 83
1. Center electrode
2. Side electrode
3. Repeat steps 1 and
(Figure 83) between the
3. Insulator
4. Air gap—0.76 mm (0.030
inch)
2 for the other spark plug.
Installing the Spark Plug
1. Install and torque the 2 spark plugs
Note:
Use a spark-plug socket and torque
wrench to tighten the spark plugs.
2. Install the spark-plug wires onto the spark plugs.
3. Install the hood; refer to
(page 45)
g326888
53
(Figure
Installing the Hood
Figure 84
78).
g028109