Yamaha YZF-R15, Service Manual

Page: 175 / 338

5-13 5-14
CAMSHAFT CAMSHAFT
CAMSHAFT
Removing the rocker arms and camshaft
Order Job/Parts to remove Qty Remarks
Cylinder head Refer to “CYLINDER HEAD” on page 5-6.
1 Locknut 2
2 Adjusting screw 2
3 Camshaft retainer 1
4 Camshaft 1
5 Rocker arm shaft 2
6 Intake rocker arm 1
7 Exhaust rocker arm 1
For installation, reverse the removal proce-
dure.
M
M
M
M
1 2
5
5
4
3
1
2
6
New
E
E
E
T
R
.
.
7 Nm (0.7 m
•
kg, 5.1 ft Ib)
•
T
R
.
.
7 Nm (0.7 m
•
kg, 5.1 ft Ib)
•
7
REMOVING THE ROCKER ARMS AND
CAMSHAFT
1. Loosen:
• Locknut “1”
• Valve clearance adjusting screw “2”
2. Remove:
• Camshaft “1”
Screw 8-mm (0.31-in) bolt “2” into the threaded
end of the camshaft and then pull out the cam-
shaft.
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.
3. Check:
• Camshaft oil passage
Obstruction → Blow out with compressed air.
CHECKING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
The following procedure applies to all of the
rocker arms and rocker arm shafts.
1. Check:
• Rocker arm
Damage/wear → Replace.
Camshaft lobe dimensions
Intake a
25.177 ± 0.05 mm
Limit
25.027 mm
Intake b
30.275 ± 0.05 mm
Limit
30.125 mm
Exhaust a
25.115 ± 0.05 mm
Limit
24.965 mm
Exhaust b
30.282 ± 0.05 mm
Limit
30.132 mm
b
a