Checking The Cylinder Head - Yamaha F50A Service Manual

3. Measure the camshaft journal diameter
c and cylinder head journal inside diam-
eter d. Replace the camshaft and cylin-
der head if out of specification.
Camshaft journal diameter c:
#1: 36.93–36.94 mm (1.4539–1.4543 in)
#2, #3, #4:
36.94–36.95 mm (1.4543–1.4547 in)
Cylinder head journal inside diameter d:
37.00–37.02 mm (1.4567–1.4575 in)
4. Calculate the camshaft oil clearance e
as follows. Replace the camshaft and
cylinder head as a set if out of specifica-
tion.
e = d – c:
#1: 0.06–0.09 mm (0.0024–0.0035 in)
#2, #3, #4:
0.05–0.08 mm (0.0018–0.0031 in)

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 five directions as shown. Replace if out
of specification.
62Y3A11
Cylinder head warpage limit:
0.1 mm (0.004 in)
Cylinder head
1
2
3
4
5
6
7
8
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