Electrical - Yamaha TT-R90(V) Owner's 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.
NOTE:
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:
CR6HSA (NGK)
U20FSR-U (DENSO)
4. Clean the plug with a spark plug cleaner if
necessary.
5. Tighten:
• Spark plug
NOTE:
• Before installing a spark plug, clean the gas-
ket surface and plug surface.
• Finger-tighten a the spark plug before torqu-
ing to specification b.
3 - 23
INSP
ADJ
13 Nm (1.3 m · kg, 9.4 ft · lb)