Checking The Spark Plugs - Yamaha YZF-R1 Series Service Manual

2. Check:
• Fuel hose "1"
Cracks/damage → Replace.
Loose connection → Connect properly.
TIP
Before removing the fuel hose, place a few rags
in the area under where it will be removed.
3. Install:
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Rider seat
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:
• Rider seat
Refer to "GENERAL CHASSIS (1)" on page
4-1.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Air filter case
Refer to "AIR FILTER CASE" on page 7-5.
• Air cut-off valve
Refer to "AIR INDUCTION SYSTEM" on
page 7-20.
2. Remove:
• Ignition coils
• Spark plugs
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.
3. Check:
• Spark plug type
Incorrect → Change.
PERIODIC MAINTENANCE
Manufacturer/model
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
1
(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
G088880
7. Install:
• Spark plugs
• Ignition coils
Spark plug
Spark plug (new)
TIP
• Before installing the spark plug, clean the
spark plug and gasket surface.
• If the spark plug is a new one, tighten it to 18
N·m (1.8 kgf·m, 13 lb·ft).
8. Install:
• Air cut-off valve
Refer to "AIR INDUCTION SYSTEM" on
page 7-20.
• Air filter case
Refer to "AIR FILTER CASE" on page 7-5.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
3-5
NGK/LMAR9E-J
0.6–0.7 mm (0.024–0.028 in)
13 N·m (1.3 kgf·m, 9.6 lb·ft)
18 N·m (1.8 kgf·m, 13 lb·ft)