3. Pull the wire(s) off the spark plug(s) ( Figure 41 ).
Figure 41
1. Spark plug wire 2. Spark plug
4. Clean around the spark plug(s) to prev ent dir t
from falling into the engine and potentially
causing damag e .
5. R emo v e the spark plug(s) and metal w asher .
Checking the Spark Plug
1. Look at the center of the spark plug(s)
( Figure 42 ). 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(s). Al w ays r eplace the spar k plug(s)
when it has: a black coating , w or n
electr odes, an oil y film, or cracks.
2. Clean the electrodes with a wire br ush or b y
scraping them to remo v e carbon de posits and
w etness .
3. Chec k the g ap betw een the center and side
electrodes ( Figure 42 ). Bend the side electrode
( Figure 42 ) if the g ap is not cor rect.
Figure 42
1. Canter electrode insulator
3. Air gap (not to scale)
2. Side electrode
Installing the Spark Plug
1. Install the spark plug(s). Mak e sure the air g ap
is set cor rectly .
2. Tighten the spark plug(s) to 17 ft-lb (23 N ⋅ m).
3. Push the wire(s) onto the spark plug(s)
( Figure 41 ).
Servicing the Spark Arrester
Inspect the spark ar rester ev er y 50 hours for
damag e , suc h as holes in the screen, and for
buildup on the screen. If it is damag ed, re place
it with a new spark ar rester . If it is dir ty , remo v e
it and clean the screen with a wire br ush and/or
soak it in solv ent.
Fuel System
Maintenance
Replacing the Fuel Filter
R e place the fuel filter after ev er y 200 operating
hours or yearly , whic hev er occurs first.
Nev er install a dir ty filter if it is remo v ed from the
fuel line .
1. Diseng ag e the PTO , mo v e the motion control
lev ers to the neutral loc k ed position, and set
the parking brak e .
2. Stop the engine , remo v e the k ey , and w ait for
all mo ving par ts to stop before lea ving the
operating position.
3. Allo w the mac hine to cool do wn.
4. Close the fuel shutoff v alv e ( Figure 43 ).
36
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