Adjusting The Valve Clearance - Yamaha YZF-R25 Service Manual

Manufacturer/model
NGK/CR9E
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)
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)
8. Install:
• Spark plugs
Spark plug
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
TIP
Before installing the spark plug, clean the spark
plug and gasket surface.
9. Connect:
• Spark plug caps
10.Install:
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Fuel tank cover assembly
Refer to "GENERAL CHASSIS (3)" on page
4-5.
• Side panels
Refer to "GENERAL CHASSIS (2)" on page
4-3.
PERIODIC MAINTENANCE
• Rider seat
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.
1. Remove:
• Rider seat
Refer to "GENERAL CHASSIS (1)" on page
4-1.
• Side panels
Refer to "GENERAL CHASSIS (2)" on page
4-3.
• Fuel tank cover assembly
• Front side cowling assembly (right)
Refer to "GENERAL CHASSIS (3)" on page
4-5.
• Water pump housing
Refer to "WATER PUMP" on page 6-6.
• Clutch cover
Refer to "CLUTCH" on page 5-49.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Air cut-off valve/Reed valve
Refer to "AIR INDUCTION SYSTEM" on
page 7-15.
2. Disconnect:
• Spark plug cap
Refer to "CAMSHAFTS" on page 5-11.
3. Remove:
• Spark plugs
• Cylinder head cover
• Cylinder head cover gasket
Refer to "CAMSHAFTS" on page 5-11.
4. Remove:
• Crankshaft end cover "1"
• Timing mark accessing bolt "2"
1
3-5
2