Adjusting The Valve Clearance - Yamaha YZF-R1 Series Service Manual

• 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.
• 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:
• Rider seat
Refer to "GENERAL CHASSIS (1)" on page
4-1.
• Front panel cover
Refer to "GENERAL CHASSIS (3)" on page
4-9.
• Front side cowling
Refer to "GENERAL CHASSIS (5)" on page
4-16.
• Side cover
• Front side cowling inner panel
Refer to "GENERAL CHASSIS (6)" on page
4-23.
• Side cover bracket
Refer to "GENERAL CHASSIS (8)" on page
4-32.
• Electrical components tray
Refer to "GENERAL CHASSIS (9)" on page
4-34.
• 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.
• Radiator
Refer to "RADIATOR" on page 6-3.
2. Remove:
• Ignition coils
• Spark plugs
• Cylinder head cover
• Cylinder head cover gasket
Refer to "CAMSHAFTS" on page 5-18.
3. Remove:
• Timing mark accessing bolt
• Crankshaft end cover
Refer to "GENERATOR" on page 5-44.
PERIODIC MAINTENANCE
4. Measure:
• Valve clearance
Out of specification → Adjust.
Valve clearance (cold)
Intake
0.09–0.17 mm (0.0035–0.0067 in)
Exhaust
0.18–0.23 mm (0.0071–0.0091 in)
a. Turn the crankshaft counterclockwise.
b. When piston #1 is at TDC on the compres-
sion stroke, align the TDC mark "a" on the
generator rotor with the generator rotor
cover slot "b".
TIP
TDC on the compression stroke can be found
when the camshaft lobes are turned away from
each other.
c. Measure the valve clearance #1 with a
thickness gauge.
TIP
Measure the valve clearance between the cam
lobe and rocker arm "c".
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
3-6
a b
c
c