Electrical - Yamaha WR450F(R) Owner's Service Manual

Hide thumbs Also See for WR450F(R):
Table of Contents

Advertisement

ELECTRICAL/SPARK PLUG INSPECTION
EC370000

ELECTRICAL

EC371001
SPARK PLUG INSPECTION
1. Remove:
Spark plug
G
2. Inspect:
Electrode 1
G
Wear/damage → Replace.
Insulator color 2
G
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
G
Use a wire gauge or thickness gauge.
Out of specification → Regap.
Spark plug gap:
0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
4. Clean the plug with a spark plug cleaner
if necessary.
5. Tighten:
Spark plug
G
NOTE:
Before installing a spark plug, clean the gas-
G
ket surface and plug surface.
Finger-tighten a the spark plug before
G
torquing to specification b.
3 - 48
INSP
ADJ
13 Nm (1.3 m · kg, 9.4 ft · lb)

Hide quick links:

Advertisement

Table of Contents
loading

This manual is also suitable for:

Wr450f

Table of Contents