Checking The Valves And Valve Guides - Yamaha FZS600'98 Service Manual

VALVES AND VALVE SPRINGS
a
b
EB403400
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of the
valves and valve guides.
1. Measure:
S valve-stem-to-valve-guide clearance
Valve-stem-to-valve-guide
clearance =
Valve guide inside diameter
Valve stem diameter
Out of specification ! Replace the valve
guide.
Valve-stem-to-valve-guide
clearance
Intake
Limit: 0.08 mm
Exhaust
Limit: 0.1 mm
2. Replace:
S valve guide
NOTE:
To ease valve guide removal and installa-
tion, and to maintain the correct fit, heat the
cylinder head to 100_C (212_C) in an oven.
a. Remove the valve guide with a valve
guide remover 1 .
b. Install the new valve guide with a valve
guide installer 2 and valve guide remov-
er 1 .
c. After installing the valve guide, bore the
valve guide with a valve guide reamer 3
to obtain the proper valve-stem-to-valve-
guide clearance.
NOTE:
After replacing the valve guide, reface the
valve seat.
Valve guide remover (ø4.0 mm)
90890-04111
Valve guide installer (ø4.0 mm)
90890-04112
Valve guide reamer (ø4.0 mm)
90890-04113
3. Eliminate:
S carbon deposits
(from the valve face and valve seat)
4-19
ENG
a
–
b