Removing The Valves And Valve Springs; Checking The Valves And Valve Springs - Yamaha MX800V Service Manual

VALVES
7
a

REMOVING THE VALVES AND VALVE SPRINGS

The following procedure applies to all of the valves, valve
springs and related components.
1.
Remove:
1
• Valve cotter "1"
2
• Valve spring retainer "2"
3
• Valve spring "3"
4
• Valve stem seal "4"
5
• Valve spring seat "5"
• Valve "6"
6
Remove the parts using the valve spring compres-
sor "7".
NOTICE
Do not compress the valve spring more than neces-
sary.
Valve spring compressor:
90890-01253

CHECKING THE VALVES AND VALVE SPRINGS

The following procedure applies to all of the valves, valve
springs and related components.
1.
Measure:
• Valve stem length "a"
• Valve head diameter "b"
Valve stem length (Intake):
b
88.8 mm (3.4961 in)
Valve stem length (Exhaust):
89.8 mm (3.5354 in)
Valve head diameter (Intake):
27.9–28.1 mm (1.0984–1.1063 in)
Valve head diameter (Exhaust):
34.9–35.1 mm (1.3740–1.3819 in)
Out of specifications  Replace.
TIP
Intake and exhaust springs are different. Do not mix.
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