Spark Plug - Yamaha SR125 Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
1. Spark plug cap

Spark plug

Removal
1. Remove the spark plug cap.
6
1. Spark plug wrench
2. Use the spark plug wrench in the
EAU01833
tool kit to remove the spark plug as
shown.
Inspection
The spark plug is an important engine
component and is easy to inspect. The
condition of the spark plug can indicate
the condition of the engine.
The ideal color on the white insulator
around the center electrode is a medi-
um-to-light tan color for a motorcycle
that is being ridden normally.
Do not attempt to diagnose such prob-
lems yourself. Instead, take the motor-
cycle to a Yamaha dealer. You should
periodically remove and inspect the
spark plug because heat and deposits
will cause any spark plug to slowly
break down and erode. If electrode ero-
sion becomes excessive, or if carbon
and other deposits are excessive, you
should replace the spark plug with the
specified plug.
6-6
Specified spark plug:
DR8EA (NGK)