Yamaha YBR 125 Service Manual page 44

Inspection and adjustment of air valve clearance
Engine
Inspection and adjustment of air valve clearance
Note:
The valve clearance must be adjusted when the
engine is cool.
Adjust the air valve clearance when the piston is at
the Top Dead Center(T.D.C) on compression stroke.
1.Remove the following parts.
Side cover(left,right)
Cushion
Fuel tank
(Refer to removal and installation of cushion,fuel tank
and cover alike)
2.Remove the following parts.
Side cover of cylinder head ,bolt
Spark plug
Rocker arm cover (Intake)
Rocker arm cover (Exhaust)
3.Remove the following parts
Cock with O-ring
Cock with O-ring
3 - 5
3
INSP
ADJ