Checking The Valve Guides; Replacing The Valve Guides - Yamaha F200C Service Manual

POWR
Valve stem runout:
Intake: 0.01 mm (0.0004 in)
Exhaust: 0.01 mm (0.0004 in)

Checking the valve guides

NOTE:
Before checking the valve guide make sure
that the valve stem diameter is within specifi-
cation.
1. Measure the valve guide inside diameter
a.
Valve guide inside diameter a:
5.504–5.522 mm
(0.2167–0.2174 in)
2. Calculate the valve stem-to-valve guide
clearance as follows. Replace the valve
guide if out of specification.
Valve stem-to-valve guide clearance
= valve guide inside diameter – valve
stem diameter:
Intake:
0.025–0.058 mm
(0.0010–0.0023 in)
Exhaust:
0.025–0.058 mm
(0.0010–0.0023 in)

Replacing the valve guides

1. Remove the valve guide 1 by striking
the special service tool from the combus-
tion chamber side.
5-35
Power unit
S69J5770
Valve guide remover: YB-06801
2. Install the new valve guide 2 by striking
the special service tool from the cam-
shaft side until the valve guide installer
3 contacts the cylinder head.
NOTE:
Apply engine oil to the surface of the new
valve guide.
Valve guide remover: YB-06801
Valve guide installer: YB-06810
3. Insert the special service tool into the
valve guide 2, and then ream the valve
guide.
S69J5790
E
S69J5800
69J1D11