Checking The Rocker Arms And Rocker Arm Shaft; Checking The Camshaft - Yamaha FT50C Service Manual

10. After every lapping procedure, be sure to
clean off any remaining lapping com-
pound from the cylinder head and the
valve.
11. Check the valve seat contact area of the
valve again.
Checking the rocker arms and rocker
arm shaft
1. Check the rocker arms, rocker arm shaft,
and rocker arm contact surface a for
wear. Replace if necessary.
2. Measure the rocker arms inside diameter
b and rocker arm shaft outside diameter
c. Replace if out of specification.
Rocker arm inside diameter b:
16.00–16.01 mm
(0.6299–0.6303 in)
Rocker arm shaft outside diameter
c:
15.98–15.99 mm
(0.6291–0.6295 in)

Checking the camshaft

1. Measure the cam lobe. Replace if out of
specification.
62Y5A11
Cam lobe a:
Intake:
30.89–30.99 mm
(1.2161–1.2200 in)
Exhaust:
30.82–30.92 mm
(1.2135–1.2175 in)
Cam lobe b:
Intake:
25.95–26.05 mm
(1.0217–1.0256 in)
Exhaust:
25.95–26.05 mm
(1.0217–1.0256 in)
2. Measure the camshaft runout. Replace if
out of specification.
Camshaft runout limit:
0.04 mm (0.0016 in)
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.
Cylinder head
5-30
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