Checking The Valve Seats - Yamaha MZ360 Service Manual

VALVE
1
2
3
4
5
6
7
8
9
10
5.
b
a
6.
a
7.
a

CHECKING THE VALVE SEATS

The following procedure applies to all of the valves and
valve seats.
1.
2.
a
Measure:
• Compressed valve spring force "a"
Out of specification  Replace.
b. Installed length
Installed compression spring force (Intake):
91.20–104.93 N (9.3–10.7 kgf, 20.50–23.59
lbf)
Installed compression spring force (Exhaust):
91.20–104.93 N (9.3–10.7 kgf, 20.50–23.59
lbf)
Installed length (Intake):
29.0 mm (1.1417 in)
Installed length (Exhaust):
29.0 mm (1.1417 in)
Measure:
• Valve spring tilt "a"
Tilt limit:
1.7 mm (0.0669 in)
Out of specifications  Replace.
Check:
• Valve spring contact surface "a"
More than 2/3 of the contact surface does not con-
tact  Replace.
Remove carbon deposits from the valve face and
valve seat.
Apply a small amount of coarse mechanic's blue lay-
out fluid to the valve face "a".
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