2. R emo v e the old filter using an oil filter wrenc h.
Wipe the filter mounting base surface clean
( Figure 38 ).
3. Apply a thin coat of clean oil to the r ubber
g ask et on the re placement filter ( Figure 38 ).
Figure 38
1. Oil lter wrench 3. Filter base
2. Oil lter 4. Gasket
4. Install the re placement oil filter to the filter
base b y hand. T ur n the oil filter cloc kwise
until the r ubber g ask et contacts the filter base;
then tighten the filter an additional 7/8 tur n
( Figure 38 ). Oil Filter tor que: 15-17 lb (20-24
N ⋅ m)
5. Add the specified amount of the recommended
oil; refer to Changing and Draining the Oil in
Engine Maintenance , pag e 29 .
6. Star t the engine and c hec k the filter for leaks .
7. Stop the engine and c hec k the oil lev el; refer to
Chec king the Oil Lev el in Engine Maintenance ,
pag e 29 . Add oil if necessar y .
Servicing the Spark Plug
Chec k the spark plug after ev er y 100 operating
hours . Mak e sure that the air g ap betw een the
center and side electrodes is cor rect before
installing the spark plug . Use a 23 spark plug
wrenc h for remo ving and installing the spark
plug(s) and a g apping tool/feeler g aug e to c hec k
and adjust the air g ap .
R e place the spark plug ev er y 300 operating hours
or yearly .
T ype: NGK BPR5ES or DENSO W16EPR-U (or
equi v alent)
Air Gap: 0.028-0.031 inc h (0.70-0.80 mm)
Removing the Spark Plug
1. Diseng ag e the blade control switc h, set the
parking brak e , stop the engine , and remo v e
the k ey .
2. R emo v e the engine hood and engine duct to
access the engine components .
3. Pull the wire off of the spark plug ( Figure 39 ).
Clean around the spark plug to prev ent dir t
from falling into the engine and potentially
causing damag e .
Figure 39
1. Spark plug wire
4. R emo v e the spark plug and metal w asher .
Checking the Spark Plug
1. Look at the center of the spark plug ( Figure 40 ).
If y ou see light bro wn or g ra y on the insulator ,
the engine is operating properly . A blac k
coating on the insulator usually means the air
cleaner is dir ty .
Important: Nev er clean the spar k plug .
Al w ays r eplace the spar k plug when it has
a black coating , w or n electr odes, an oil y
film, or cracks.
2. Chec k the g ap betw een the center and side
electrodes ( Figure 40 ). Bend the side electrode
( Figure 40 ) if the g ap is not cor rect.
32
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