Checking The Valve Lifters; Installing The Valves - Yamaha YZF-R1B 2012 Service Manual

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b. Installed length
3. Measure:
• Valve spring tilt "a"
Out of specification → Replace the valve
spring.
Spring tilt limit
Spring tilt (intake)
2.5°/1.7 mm (0.067 in)
Spring tilt (exhaust)
2.5°/1.7 mm (0.067 in)
EAS24320

CHECKING THE VALVE LIFTERS

The following procedure applies to all of the
valve lifters.
1. Check:
• Valve lifter
Damage/scratches → Replace the valve
lifters and cylinder head.
email: info@motomatrix.co.uk
VALVES AND VALVE SPRINGS
EAS24340

INSTALLING THE VALVES

The following procedure applies to all of the
valves and related components.
1. Deburr:
• Valve stem end
(with an oil stone)
2. Lubricate:
• Valve stem "1"
• Valve stem seal "2"
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
3. Install:
• Valve spring seat "1"
• Valve stem seal "2"
• Valve "3"
• Valve spring "4"
• Valve spring retainer "5"
(into the cylinder head)
TIP
• Make sure each valve is installed in its origi-
nal place. Refer to the following embossed
marks.
Intake valve: Blue paint mark
Exhaust valve: "14B"
• Install the valve springs with the larger pitch
"a" facing up.
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