Yamaha RD250I Betriebsanleitung Seite 94

C A U T I O N :
Spark plugs are produced in several
different thread lengths. The thread
length (reach) is the distance from the
spark plug gasket seat to the end of the
threaded portion. If the reach is too long,
overheating and engine damage may
result.
If the reach is too Short, spark plug fouling
and poor Performance may result; also,
carbon will form on the exposed threads
resulting in combustion Chamber hot spots
and thread damage. Always use a-spark
plug with the proper reach.
Spark plug reach: 19 m m
Before installing any spark plug, measure
the electrode gap with a wire thickness
gauge and adjust to specifications.
Spark plug gap: 0.6 ~ 0.7 m m
When installing the plug, always clean the
gasket surface and use a new gasket.
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