Yamaha F50D Servise Manual - page 179
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A
Checking the camshaft
1.
Measure the cam lobe. Replace if out of
specification.
2.
Measure the camshaft runout. Replace if
above specification.
3.
Measure the camshaft journal diameter
c
. Replace the camshaft if out of specifi-
cation.
Checking the cylinder head
1.
Eliminate carbon deposits from the com-
bustion chambers and check for deterio-
ration.
2.
Check the cylinder head warpage using
a straightedge
1
and thickness gauge
2
in 5 directions. Replace if above spec-
ification.
Rocker arm inside diameter
b
:
16.000–16.018 mm (0.6299–0.6306 in)
Rocker arm shaft outside diameter
c
:
15.971–15.991 mm (0.6288–0.6296 in)
Cam lobe
a
:
Intake:
30.888–30.988 mm (1.2161–1.2200 in)
Exhaust:
30.824–30.924 mm (1.2135–1.2175 in)
Cam lobe
b
:
Intake:
25.950–26.050 mm (1.0217–1.0256 in)
Exhaust:
25.950–26.050 mm (1.0217–1.0256 in)
c
a
b
a
b
Camshaft runout:
0.030 mm (0.0012 in)
Camshaft journal diameter
c
:
#1:
36.925–36.945 mm (1.4537–1.4545 in)
#2, #3, #4:
36.935–36.955 mm (1.4541–1.4549 in)
c
c
c
c
Camshaft and valve