Yamaha MBK X-MAX 300 2017, Service Manual

Page: 76 / 462

PERIODIC MAINTENANCE
3-5
2. Remove:
• Spark plug cap
• Spark plug
NOTICE
ECA13330
Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from falling
into the cylinder.
3. Check:
• Spark plug type
Incorrect
→
Change.
4. Check:
• Electrode “1”
Damage/wear
→
Replace the spark plug.
• Insulator “2”
Abnormal color
→
Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
• Spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
• Spark plug gap “a”
(with a wire thickness gauge)
Out of specification
→
Regap.
7. Install:
• Spark plug “1”
• Spark plug cap
TIP
• Before installing the spark plug, clean the
spark plug and gasket surface.
• When tightening the spark plug, make sure
that the inside “a” of the spark plug wrench “2”
does not the contact the portion “b” of the spark
plug.
8. Install:
• Storage box
Refer to “GENERAL CHASSIS (4)” on page
4-10.
EAS30622
ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
TIP
• Valve clearance adjustment should be made
on a cold engine, at room temperature.
• When the valve clearance is to be measured or
adjusted, the piston must be at top dead center
(TDC) on the compression stroke.
1. Remove:
• Battery cover assembly
Refer to “GENERAL CHASSIS (1)” on page
4-1.
• Front cowling assemblies
Refer to “GENERAL CHASSIS (2)” on page
4-4.
• Lower side covers
Refer to “GENERAL CHASSIS (4)” on page
4-10.
• Bottom cover assembly
Refer to “GENERAL CHASSIS (5)” on page
4-13.
Manufacturer/model
NGK/LMAR8A-9
Spark plug gap
0.8–0.9 mm (0.031–0.035 in)
T
R
.
.
Spark plug
13 N·m (1.3 kgf·m, 9.6 lb·ft)
a
b
2
1