Checking The Timing Chain And Camshaft Sprocket; Checking The Timing Chain Guides; Checking The Timing Chain Tensioner - Yamaha YZF-R1 2007 Service Manual

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5. Measure:
• Camshaft journal diameter "a"
Out of specification → Replace the cam-
shaft.
Within specification → Replace the cylinder
head and the camshaft caps as a set.
Camshaft journal diameter
24.459–24.472 mm (0.9630–
0.9635 in)
EAS23870
CHECKING THE TIMING CHAIN AND CAM-
SHAFT SPROCKET
1. Check:
• Timing chain "1"
Damage/stiffness → Replace the timing
chain and camshaft and camshaft sprocket
as a set.
email: info@motomatrix.co.uk
2. Check:
• Camshaft sprocket
More than 1/4 tooth wear "a" → Replace
the camshaft sprocket and the timing chain
as a set.
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
EAS23950

CHECKING THE TIMING CHAIN GUIDES

The following procedure applies to all of the
camshaft sprockets and timing chain guides.
1. Check:
• Timing chain guide (exhaust side) "1"
• Timing chain guide (intake side) "2"
• Timing chain guide (top side) "3"
Damage/wear → Replace the defective
part(s).
EAS23960
CHECKING THE TIMING CHAIN TEN-
SIONER
1. Remove:
• Timing chain tensioner housing "1"
• Timing chain tensioner rod "2"
• Timing chain tensioner spring "3"
5-13
CAMSHAFTS