Yamaha MX775 - Removing the Valves and Valve Springs; Checking the Valves and Valve Springs

3-28
1
2
3
4
5
6
7
8
9
10
ENGINE
VALVES
REMOVING THE VALVES AND VALVE SPRINGS
The following procedure applies to all of the valves, valve
springs and related components.
1. Remove:
• Valve cotter “1”
• Valve spring retainer “2”
• Valve spring “3”
• Valve stem seal “4”
• Valve spring seat “5”
•Valve “6”
Remove the parts using the valve spring compres-
sor “7”.
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”
Out of specifications  Replace.
TIP
Intake and exhaust springs are different. Do not mix.
1
2
3
4
5
6
7
Do not compress the valve spring more than neces-
sary.
Valve spring compressor:
90890-01253
NOTICE
b
a
Valve stem length (Intake):
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)