ENGINE
3-4
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:
•Seat
Refer to "GENERAL CHASSIS" on page 4-
1.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Battery
Refer to "GENERAL CHASSIS" on page 4-
1 and "CHECKING AND CHARGING THE
BATTERY" on page 8-114.
• Air filter case
Refer to "GENERAL CHASSIS" on page 4-
1.
• Battery box
• Battery box bracket
Refer to "GENERAL CHASSIS" on page 4-
1.
• Throttle bodies
Refer to "THROTTLE BODIES" on page 7-
4.
• Air cut-off valve
Refer to "AIR INDUCTION SYSTEM" on
page 7-9.
•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 5-8.
3. Remove:
• Pickup rotor cover “1”
4. Measure:
• Valve clearance
Out of specification → Adjust.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
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 (cold)
Intake
0.13–0.20 mm (0.0051–0.0079
in)
Exhaust
0.23–0.30 mm (0.0091–0.0118
in)
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