Yamaha F50A - Checking the Oil Pump; Installing the Valves

POWR
Power unit
5-47
62Y3A11
Checking the oil pump
1. Measure the oil pump rotor clearances
as shown. Replace if out of specification.
Installing the valves
1. Install the new valve stem seal
1
to the
valve guide, and then apply engine oil to
the valve guide.
2. Install the valve
2
, spring seat
3
, valve
spring
4
, and spring retainer
5
in the
sequence shown, and then attach the
special service tool.
NOTE:
Face the fine pitch side
a
of the valve spring
toward the spring seat.
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)
Valve spring compressor
6
:
YM-01253 / 90890-04019
Valve spring compressor attachment
7
:
90890-06320
S62Y5590
E
1