Yamaha F50A - Checking the Rocker Arms and Rocker Arm Shaft; Checking the Camshaft

POWR
Power unit
5-45
62Y3A11
CAUTION:
Do not get the lapping compound on the
valve stem and valve guide.
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.
Checking the camshaft
1. Measure the cam lobe. Replace if out of
specification.
2. Measure the camshaft runout. 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)
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)
Camshaft runout limit: 0.04 mm (0.0016 in)