Checking The Camshaft - Yamaha YJ125S Service Manual

THE ROCKER ARMS AND CAMSHAFT
a
Rocker-arm-to-rocker-arm-shaft
clearance
0.009 ~ 0.034 mm(0.0004~0.001 in)
EAS00205

CHECKING THE CAMSHAFT

1. Check:
8 camshaft bushings
Damage/wear
2. Check:
8 camshaft lobes
Blue discoloration/pitting/scratches
Replace the camshaft.
3. Measure:
8 camshaft lobe dimensions a and b
Out of specification
shaft.
Camshaft lobe dimension limit
Intake
a a a a a 26.153~26.253 mm (1.030 ~
b
1.034 in)
<Limit>:26.053mm
b b b b b 21.015~21.115 mm (0.827 ~
0.831 in)
<Limit>:20.915mm
Exhaust
a a a a a 26.153~26.253 mm (1.030 ~
1.034 in)
<Limit>:26.053mm
b b b b b 21.056~21.156 mm (0.829 ~
0.833 in)
<Limit>:20.956mm
4. Check:
8 camshaft oil passage
Obstruction
air.
5-16
ENG
Replace.
Replace the cam-
Blow out with compressed