Yamaha MX360 - Spark Plug Inspection

28
Periodic maintenance
Spark plug inspection
The spark plug is important engine components, which
should be checked periodically.
1. Remove the spark plug cap and the spark plug.
2. Check for discoloration and remove the carbon.
The porcelain insulator around the center elec-
trode of spark plug should be a slightly colored
light gray.
3. Check the spark plug type and gap.
TIP
The spark plug gap should be measured with a wire
thickness gauge and, if necessary, adjusted to specifi-
cation.
4. Install the spark plug and then tighten it.
TIP
If a torque wrench is not available when installing a
spark plug, a good estimate of the correct torque is
1/4–1/2 turn past finger tight. However, the spark plug
1
2
1
2
1. Spark plug cap
2. Spark plug
A MX175/MX200
B MX250/MX300/MX360/MX400
1
1. Spark plug gap
Standard spark plug:
BPR4ES (NGK)
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Spark plug tightening torque:
20 N·m (2.0 kgf·m, 15 lb·ft)
7VE-F8199-72-E0.book 28 ページ ２０１８年６月１３日 水曜日 午後３時１５分
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