Yamaha RD200 1977 Betriebsanleitung Seite 87

1. Spark plug
1. Bougies
1. Zündkerze
S p a r k plug i n s p e c t i o n
The spark plug is one of the most important
of the engine components and is the easiest
to inspect. By examining the condition of the
spark plug we can, to some extent, determine
the condition of the engine. If the engine is
operating correctly, and the machine is being
ridden correctly, the white porcelain insulator
around the center electrode will be a medium
to light tan color. If the porcelain is very dark
brown or black color and the firing end is wet
with oil or sooty, the spark plug may be too
" c o l d " . A "hotter" spark plug may be
required. This Situation is common during
engine break-in. If the insulator is glazed and
very light or white in color, or if the electrodes
show signs of melting, a "colder" spark plug
may be required. If spark plug appearance
indicates a Performance problem, ask a
Yamaha dealer to investigate the Situation.
Do not change the spark plug type without
Consulting with your dealer.
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