Yamaha FT50C - Checking the Cylinder Head; Checking the Oil Pump

POWR
Power unit
5-31
62Y5A11
4. Calculate the camshaft oil clearance
e
as follows. Replace the camshaft and
cylinder head as a set if out of specifica-
tion.
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.
Checking the oil pump
1. Measure the oil pump rotor clearances
as shown. Replace 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)
e
=
d
–
c
:
#1:
0.06–0.10 mm
(0.0022–0.0039 in)
#2, #3, #4:
0.05–0.09 mm
(0.0018–0.0035 in)
Cylinder head warpage limit:
0.1 mm (0.004 in)
Clearance
a
:
0.09–0.15 mm (0.004–0.006 in)
Clearance
b
:
0.01–0.10 mm (0.0004–0.0039 in)
Clearance
c
:
0.03–0.08 mm (0.001–0.003 in)