Yamaha YP125R, Service Manual

Page: 319 / 498

CAMSHAFT (YP250R)
5-74
EAS23770
REMOVING THE ROCKER ARMS AND
CAMSHAFT
1. Straighten the lock plate tabs “a”.
2. Remove:
• Lock plate “1”
• Camshaft retainer “2”
3. Remove:
• Rocker arm shafts
• Rocker arms
TIP
Remove the rocker arm shafts with the slide
hammer bolt “1” and weight “2”.
4. Remove:
• Camshaft “1”
TIP
Screw a M10 bolt “2” into the threaded end of the
camshaft, and then pull out the camshaft.
EAS23840
CHECKING THE CAMSHAFT
1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches
→
Re-
place the camshaft.
2. Measure:
• Camshaft lobe dimensions “a” and “b”
Out of specification
→
Replace the camshaft.
Slide hammer bolt
90890-01083
Slide hammer bolt 6 mm
YU-01083-1
Weight
90890-01084
YU-01083-3
Camshaft lobe dimensions
Intake A
37.051–37.151 mm (1.4587–
1.4626 in)
Limit
36.950 mm (1.4547 in)
Intake B
30.074–30.174 mm (1.1840–
1.1880 in)
Limit
29.974 mm (1.1801 in)
Exhaust A
37.053–37.153 mm (1.4588–
1.4627 in)
Limit
36.953 mm (1.4548 in)
Exhaust B
30.091–30.191 mm (1.1847–
1.1886 in)
Limit
29.991 mm (1.1807 in)