Checking The Valve Lifters; Installing The Valves - Yamaha Wolverine YX70EPNG Service Manual

b. Installed length
2. Measure:
• Valve spring tilt "a"
Out of specification → Replace the valve
spring.
Spring tilt (intake)
1.7 mm (0.07 in)
Spring tilt (exhaust)
1.7 mm (0.07 in)
EBS30441

CHECKING THE VALVE LIFTERS

The following procedure applies to all of the
valve lifters.
1. Check:
• Valve lifter
Damage/scratches → Replace the valve lift-
ers and cylinder head.
EBS30145

INSTALLING THE VALVES

The following procedure applies to all of the
valves and related components.
1. Deburr:
• Valve stem end
(with an oil stone)
VALVES AND VALVE SPRINGS
2. Lubricate:
• Valve stem "1"
• Valve stem end
• Valve stem seal "2"
(with the recommended lubricant)
Recommended lubricant
Engine oil
1
3. Install:
• Valve spring seat "1"
(into the cylinder head)
• Valve stem seal "2"
• Valve "3"
• Valve spring "4"
• Valve spring retainer "5"
TIP
• Make sure each valve is installed in its original
place.
• Install the valve springs with the larger pitch "a"
facing up.
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