Yamaha F50F - Checking the Valve Springs; Checking the Valves

6C13G11
5-24
1
2
3
4
5
6
7
8
9
6. Remove the intake and exhaust valves.
NOTE:
Be sure to keep the valves, springs, and
other parts in the order as they were
removed.
Checking the valve springs
1. Measure the valve spring free length
a
.
Replace if below specification.
2. Measure the valve spring tilt
b
. Replace
if above specification.
Checking the valves
1. Check the valve face for pitting or wear.
Replace if necessary.
2. Measure the valve margin thickness
a
.
Replace if below specification.
Valve spring compressor
6
:
90890-04019
Valve spring compressor
attachment
7
:
90890-06320
Valve spring free length
a
:
39.85 mm (1.5689 in)
Valve spring tilt limit
b
:
1.7 mm (0.07 in)
Valve margin thickness
a
:
Intake:
0.8–1.2 mm (0.031–0.047 in)
Exhaust:
1.0–1.4 mm (0.039–0.055 in)
Cylinder head