Yamaha MX360 - Checking the Valve Seats

VALVE
3-40
1
2
3
4
5
6
7
8
9
10
ENGINE
5.
Measure:
• Compressed valve spring force “a”
Out of specification  Replace.
6.
Measure:
• Valve spring tilt “a”
Out of specifications  Replace.
7.
Check:
• Valve spring contact surface “a”
More than 2/3 of the contact surface does not con-
tact  Replace.
CHECKING THE VALVE SEATS
The following procedure applies to all of the valves and
valve seats.
1.
Remove carbon deposits from the valve face and
valve seat.
2.
Apply a small amount of coarse mechanic’s blue lay-
out fluid to the valve face “a”.
b
a
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)
a
Tilt limit:
1.7 mm (0.0669 in)
a
a