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Maintenance – Half-annually
8.8.2 Cleaning, checking the spark plug, replacing if necessary
Fig. 54
Fig. 55
76
NOTICE!
Danger of engine damage!
–
Do not use spark plugs with incorrect heat value.
Recommended spark plugs:
NGK
DENSO
Protective equipment:
n
n
Special tool:
n
1.
Park the machine in secured condition
the machine in secured condition.' on page 56.
2.
Allow the engine to cool down for at least 15 minutes.
3.
Clean the area around the spark plug.
4.
Unscrew the spark plug using a 13/16 inch spark plug
spanner.
5.
Check the condition of the spark plug, clean if necessary.
6.
In case of excessive combustion residues or burned off elec-
trodes replace the spark plug.
7.
Check the electrode gap of the spark plug with a feeler
gauge, if necessary adjust the gap.
ð Nominal value: 0.7 - 0.8 mm (0.028 - 0.032 in)
8.
Turn the spark plug carefully in by hand.
9.
Once the sealing surface of the new spark plug is in contact
tighten for another 1/2 turn with the spark plug spanner.
10.
Once the sealing surface of the used spark plug is in contact
tighten for another 1/8 to 1/4 turn with the spark plug
spanner.
BP 25/50
BPR6ES
W20EPR-U
Working clothes
Protective gloves
13/16 inch spark plug spanner
Ä Chapter 6.5 'Park
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