Adjusting The Valve Clearance - Yamaha MBK X-MAX 300 2017 Service Manual

2. Remove:
• Spark plug cap
• Spark plug
ECA13330
NOTICE
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.
Manufacturer/model
NGK/LMAR8A-9
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.
Spark plug gap
0.8–0.9 mm (0.031–0.035 in)
PERIODIC MAINTENANCE
7. Install:
• Spark plug "1"
• Spark plug cap
Spark plug
13 N·m (1.3 kgf·m, 9.6 lb·ft)
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.
a
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.
3-5
b
2
1