Checking The Camshafts - Yamaha YZF-R1B 2012 Service Manual

Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys
7. Remove:
• Dowel pins
• Timing chain guide (intake side)
• Timing chain guide (exhaust side)
8. Remove:
• Pickup rotor
Refer to "PICKUP ROTOR" on page 5-42.
• Timing chain
• Crankshaft sprocket "1"
• Collar "2"
• Straight key "3"
EAS23850

CHECKING THE CAMSHAFTS

1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches →
Replace the camshaft.
2. Measure:
• Camshaft lobe dimensions "a" and "b"
Out of specification → Replace the cam-
shaft.
email: info@motomatrix.co.uk
Camshaft lobe dimension limit
Intake A
37.350–37.450 mm (1.4705–
1.4744 in)
Limit
37.250 mm (1.4665 in)
Intake B
28.034–28.134 mm (1.1037–
1.1076 in)
Limit
27.934 mm (1.0998 in)
Exhaust A
36.450–36.550 mm (1.4350–
1.4390 in)
Limit
36.350 mm (1.4311 in)
Exhaust B
28.006–28.106 mm (1.1026–
1.1065 in)
Limit
27.906 mm (1.0987 in)
3. Measure:
• Camshaft runout
Out of specification → Replace.
Camshaft runout limit
0.030 mm (0.0012 in)
5-17
CAMSHAFTS