Engine; Valve Clearance Adjustment - Yamaha SR125 1997 Service Manual

VALVE CLEARANCE ADJUSTMENT

SR03004

ENGINE

VALVE CLEARANCE ADJUSTMENT
NOTE:
Valve clearance adjustment should be made
with the engine cool, at room temperature.
When the valve clearance is to be measured or
adjusted, the piston must be at Top Dead Cen-
ter (T.D.C.) on the compression stroke.
1. Remove:
S Seat
S Side cover (left and right)
S Fuel tank
Refer to "SIDE COVER, SEAT AND FUEL
TANK" section.
2. Remove:
S Spark plug cap 1
S Spark plug
S Valve cover (intake side) 2
S Valve cover (exhaust side) 3
3. Remove:
S Timing check plug (with O-ring) 1
S Center plug (with O-ring) 2
4. Measure:
S Valve clearance
Out of specification ! Adjust.
Valve clearance (cold):
Intake valve 0.05
Exhaust valve 0.11
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Measurement steps:
S Rotate the crankshaft counterclockwise to
align the slit a on the rotor with the station-
ary pointer b on the crankcase cover (left)
when the piston is Top Dead Center (TDC).
S Measure the valve clearance by using a feel-
er gauge.
Out of specification ! Adjust clearance.
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3-4
INSP
ADJ
0.09 mm
0.15 mm