Servicing the Spark Plug
Service Interval : Every 100 hours or yearly ,
whichever comes rst —Check the
spark plug(s).
Every 200 hours/Every 2 years (whichever
comes rst) —Replace the spark plug(s).
Ensure that 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 and a gapping tool or feeler gauge to
check and adjust the air gap. Install a new spark plug
if necessary .
T ype: Champion
®
XC12YC
Air gap: 0.76 mm (0.03 inch)
Removing the Spark Plug
1. Park the machine on a level surface, disengage
the blade-control switch, and move the
motion-control levers outward to the P ARK
position.
2. Shut of f the engine, remove the key , and wait
for all moving parts to stop before leaving the
operating position. Allow the engine to cool.
3. Clean the area around the base of the plug to
keep dirt and debris out of the engine.
4. Remove the spark plug ( Figure 45 ).
g027478
Figure 45
Checking the Spark Plug
Important: Do not clean the spark plug(s).
Always replace the spark plug(s) when it has a
black coating, worn electrodes, an oily lm, or
cracks.
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 .
Set the gap to 0.75 mm (0.03 inch).
g206628
Figure 46
Installing the Spark Plug
g027480
Figure 47
Cleaning the Blower
Housing
Service Interval : Every 100 hours/Y early (whichever
comes rst)
T o ensure proper cooling, ensure that the grass
screen, cooling ns, and other external surfaces of the
engine are kept clean at all times.
Clean the cooling ns and external surfaces as
necessary . Make sure that the cooling shrouds are
installed. T orque the blower housing screws to 7.5
N∙m (5.5 ft-lb).
Important: Operating the engine with a blocked
grass screen, dirty or plugged cooling ns, and/or
cooling shrouds removed, causes engine damage
due to overheating.
37
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