RIEJU tango 50 Owner's Manual page 98

SPARKPLUG INSPECTION
The sparkplug is a very important engine component and is easy to inspect. It should be removed and
inspected on a regular basis because heating and soot deposits will slowly deteriorate it. If the electrode
is excessively eroded or there are heavy soot or other deposits, then the sparkplug should be replaced
using a recommended spare part.
NGK 13129ES
Before any sparkplug is installed, the separation between the electrodes should be measured using a feeler
gauge and adjusted if necessary. Electrode separation should be between approximately 0.6 and 0.7 mm.
Before actually installing the new sparkplug, the washer seating surface must always be thoroughly clea-
ned to prevent any foreign bodies from entering the combustion chamber. First, smoothly screw the spark-
plug in by hand and then complete this with about 1/4 turn with the correct sparkplug spanner.
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