Checking The Rocker Arms And Rocker Arm Shaft; Checking The Camshaft - Yamaha F50F Service Manual

POWR
9. Apply a thin, even layer of lapping com-
pound onto the valve seat, and then lap
the valve using a valve lapper (commer-
cially available).
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 arm inside diameter
b and rocker arm shaft outside diameter
c. Replace if out of specification.
5-29
Power unit
Rocker arm inside diameter b:
16.000–16.018 mm
(0.6299–0.6306 in)
Rocker arm shaft outside
diameter c:
15.971–15.991 mm
(0.6288–0.6296 in)

Checking the camshaft

1. Measure the cam lobe. Replace if out of
specification.
Cam lobe a:
Intake:
30.888–30.988 mm
(1.2161–1.2200 in)
Exhaust:
30.824–30.924 mm
(1.2135–1.2175 in)
Cam lobe b:
Intake and exhaust:
25.950–26.050 mm
(1.0216–1.0256 in)
2. Measure the camshaft runout. Replace if
above specification.
Camshaft runout limit:
0.03 mm (0.0012 in)
6C13G11