Checking The Spark Plugs; Adjusting The Valve Clearance - Yamaha TMAX 2020 Service Manual

3. Install:
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Footboard
• Rear side cowling assembly
• Side cover
• Fuel tank cover assembly
• Center cover
Refer to "GENERAL CHASSIS (2)" on
page 4-11.
• Bottom center cowling
• Side panel
• Bottom side cowling
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
EAS30620

CHECKING THE SPARK PLUGS

The following procedure applies to all of the
spark plugs.
1. Remove:
• Bottom side cowling
• Side panel
• Radiator cover
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
2. Disconnect:
• Spark plug cap
3. Remove:
• Spark plug
ECA13320
NOTICE
Before removing the spark plugs, blow away
any dirt accumulated in the spark plug wells
with compressed air to prevent it from falling
into the cylinders.
4. Check:
• Spark plug type
Incorrect  Change.
Manufacturer/model
NGK/LMAR7G
5. Check:
• Electrode "1"
Damage/wear  Replace the spark plug.
• Insulator "2"
Abnormal color  Replace the spark plug.
Normal color is medium-to-light tan.
6. Clean:
• Spark plug
(with a spark plug cleaner or wire brush)
PERIODIC MAINTENANCE
7. Measure:
• Spark plug gap "a"
(with a wire thickness gauge)
Out of specification  Regap.
Spark plug gap
0.7–0.8 mm (0.028–0.031 in)
G088879
8. Install:
• Spark plug
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.
9. Connect:
• Spark plug cap
10.Install:
• Radiator cover
• Side panel
• Bottom side cowling
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
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:
• Bottom side cowling
• Side panel
• Radiator cover
• Bottom center cowling
• Refer to "GENERAL CHASSIS (1)" on
page 4-1.
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