Checking The Spark Plug - Yamaha YFM450FAR Service Manual

CHECKING THE SPARK PLUG

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CHECKING THE SPARK PLUG
1.Remove:
Seat
G
Fuel tank side panel (right)
G
Refer to "SEAT, CARRIERS, FENDERS
AND FUEL TANK".
2.Remove:
Spark plug
G
3.Check:
Spark plug type
G
Incorrect → Replace.
Standard spark plug:
DR8EA/NGK
4.Check:
Electrode 1
G
Wear/damage → Replace.
Insulator 2
G
Abnormal color → Replace.
Normal color is a medium-to-light tan color.
5.Clean the spark plug with a spark plug
cleaner or wire brush.
6.Measure:
Plug gap a
G
Use a wire gauge or feeler gauge.
Out of specification → Regap.
Spark plug gap:
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
7.Tighten:
Spark plug
G
NOTE:
Before installing a spark plug, clean the gasket
surface and plug surface.
8.Install:
Fuel tank side panel (right)
G
Seat
G
Refer to "SEAT, CARRIERS, FENDERS
AND FUEL TANK".
3 - 19
CHK
ADJ
18 Nm (1.8 m • kg, 13 ft • lb)