Operation Manual

20
MAINTENANCE
SPARK PLUG
Recommended spark plugs:
BPR-6ES (NGK)
W20EPR-U (NIPPONDENSO Co., Ltd).
CAUTION :
• The use of spark plugs with an incorrect heat range can cause damage to the engine.
If the engine has been running, do not touch the muffler or the spark plug as you risk
burning yourself.
1. Remove the cap and unscrew the spark plug using a spark plug spanner.
2. Examine the spark plug carefully, and replace it if there are thick deposits on the
electrodes or if the insulator is cracked or broken. Clean the spark plug with a wire brush.
CAUTION :
• Never clean the spark plug by sand blasting.
3. Measure the gap between the electrodes with a set
of feeler gauges: it must be between 0.7 and 0.8
mm. If the gap has to be adjusted, bend the side
electrode carefully.
4. Check the state of the sealing washer, then thread
the plug back in by hand until it is hand-tight and
seated properly.
5. Using a spark plug spanner, screw the plug in an
extra 1/2 turn for a new spark plug, to compress its
washer, or between 1/8 and 1/4 turn in the case of a
plug being reused. Put the spark plug cap back on.
CAUTION :
• The spark plug must be properly tightened or else it is likely to overheat considerably,
causing damage to the engine.
0.7 ~ 0.8 mm
ANGLAIS.book Page 20 Lundi, 18. février 2008 11:11 11