Yamaha F200B, Service Manual

Page: 321 / 579

7-62
7
TIP:
Make sure to keep the parts in the order as
they were removed.
3. Remove the valve seals 4 .
Checking the cylinder head
1. Eliminate carbon deposits from the com-
bustion chambers and check the cylinder
head for damage and scratches.
2. Check the cylinder head warpage using a
straightedge
1 and thickness gauge 2
in the directions shown. Replace the cyl-
inder head assembly if above specifica-
tion.
Checking the valve spring
1. Measure the valve spring free length
a
.
2. Measure the valve spring tilt
b
. Replace
if above specification.
Checking the valve
1. Check the valve face. Replace if pitted or
worn.
2. Measure the valve margin thickness
a
.
Replace if out of specification.
Valve spring compressor
2
: 90890-04019
Valve spring compressor attachment
3
:
90890-06320
4
1
2
Cylinder head warpage limit:
0.10 mm (0.0039 in)
Valve spring free length
a
:
48.1 mm (1.89 in)
Valve spring tilt limit
b
: 1.7 mm (0.07 in)
a
b
a
Cylinder head