Removing The Rocker Arms And Camshaft; Checking The Camshaft - Yamaha YXR70FX Service Manual

ROCKER ARMS AND CAMSHAFT
2
1
4 - 22
EBS00237
REMOVING THE ROCKER ARMS AND
CAMSHAFT
1. Loosen:
• locknuts
• valve adjusting screws
2. Remove:
• intake rocker arm shaft
• exhaust rocker arm shaft
• intake rocker arm
• exhaust rocker arm
TIP:
_
Remove the rocker arm shafts with the slide
hammer bolt 1 and weight 2.
Slide hammer bolt
90890-01083
Slide hammer bolt 6 mm
YU-01083-1
Weight
90890-01084, YU-01083-3
EBS00223

CHECKING THE CAMSHAFT

1. Check:
• cam lobes
Pitting/scratches/blue discoloration →
Replace.
2. Measure:
• cam lobe dimensions a and b
Out of specification → Replace.
Camshaft lobe dimensions
Intake
a 42.481 ~ 42.581 mm
(1.6725 ~ 1.6764 in)
<Limit>:
42.381 mm (1.6685 in)
b 36.950 ~ 37.050 mm
(1.4547 ~ 1.4587 in)
<Limit>:
36.850 mm (1.4508 in)
Exhaust
a 43.129 ~ 43.229 mm
(1.6980 ~ 1.7019 in)
<Limit>:
43.029 mm (1.6941 in)
b 36.982 ~ 37.082 mm
(1.4560 ~ 1.4599 in)
<Limit>:
36.882 mm (1.4520 in)
ENG