Electrical - Yamaha TT-R125EY Service Manual

ELECTRICAL/SPARK PLUG INSPECTION
EC370000

ELECTRICAL

EC371001
SPARK PLUG INSPECTION
1. Remove:
• Spark plug
2. Inspect:
• Electrode 1
Wear/damage → Replace.
• Insulator color 2
Normal condition is a medium to light tan
color.
Distinctly different color → Check the
engine condition.
TIP
When the engine runs for many hours at low
speeds, the spark plug insulator will become
sooty, even if the engine and carburetor are in
good operating condition.
3. Measure:
• Plug gap a
Use a wire gauge or thickness gauge.
Out of specification → Regap.
Spark plug gap:
0.6 ~ 0.7 mm (0.02 ~ 0.03 in)
Standard spark plug:
CR7HSA (NGK)
U22FSR-U (DENSO)
4. Clean the plug with a spark plug cleaner if
necessary.
5. Tighten:
• Spark plug
13 Nm (1.3 m · kg, 9.4 ft · lb)
TIP
• Before installing a spark plug, clean the
gasket surface and plug surface.
• Finger-tighten a the spark plug before
torquing to specification b.
3-33
INSP
ADJ