Engine; Adjusting The Valve Clearance - Yamaha FZ1-N Service Manual

EAS20470

ENGINE

EAS20490

ADJUSTING THE VALVE CLEARANCE

The following procedure applies to all of the
valves.
NOTE:
• 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 and passenger seat
Refer to "GENERAL CHASSIS" on page 4-
1.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Air filter case
Refer to "GENERAL CHASSIS" on page 4-
1.
• Throttle body assembly
Refer to "THROTTLE BODIES" on page 7-
4.
• Air cut-off valve
Refer to "AIR INDUCTION SYSTEM" on
page 7-13.
• Radiator
• Radiator fan motor
Refer to "RADIATOR" on page 6-1.
2. Remove:
• Ignition coils
• Spark plugs
• Cylinder head cover
• Cylinder head cover gasket
Refer to "CAMSHAFTS" on page 5-10.
3. Remove:
• Pickup rotor cover "1"
4. Measure:
• Valve clearance
Out of specification → Adjust.
Valve clearance (cold)
Intake valve
0.11–0.20 mm (0.0043–0.0079
in)
Exhaust valve
0.21–0.25 mm (0.0083–0.0098
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
pickup rotor with the crankcase mating sur-
face "b".
NOTE:
TDC on the compression stroke can be found
when the camshaft lobes are turned away from
each other.
c. Measure the valve clearance with a thick-
ness gauge "1".
NOTE:
• If the valve clearance is incorrect, record the
measured reading.
• Measure the valve clearance in the following
sequence.
Valve clearance measuring sequence
Cylinder #1 → #2 → #4 → #3
3-4
ENGINE