BIBI 850-BL Use and maintenance manual Rev.00
97
6.17 Spark plug inspection and replacement
To obtain a good performance, the gap between the electrodes of the spark plug must be correct and it
must be free from deposits. Comply with the instructions below:
1) remove the spark plug cap and clean off the dirt around the spark plug itself
2) remove the spark plug with a 13/16-inch wrench
3) visually inspect the spark plug and replace it if it is very worn or soiled, if the washer is in a bad
condition or if the electrode is worn
4) measure the gap between the spark plug electrodes with a wire gauge. Correct the distance as
required, by carefully bending the side electrode. The gap between the electrodes should be 0.7-
0.8 mm.
5) Carefully install the spark plug by hand to avoid screwing it in badly.
6) Once the spark plug has been housed, tighten it with a 13/16-inch spark plug wrench so as to
compress the washer.
NEW SPARK PLUG= tighten 1/2 of a turn once the spark plug has been housed, so as to
compress the washer
ORIGINAL SPARK PLUG= tighten 1/4-1/8 of a turn once the spark plug has been housed, so
as to compress the washer
RECOMMENDED SPARK PLUGS
BPR6ES (NGK)
W20EPR-U (DENSO) (Honda indications)
A spark plug that is too loose can overheat and damage the engine. The tip thread could be
damaged if the spark plug is tightened too much.
W
ASHER
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