Honda 88-91 NT650 HAWK GT Serviceanleitung Seite 113

CYLINDER HEAD/VALVES
Valve stem-to-guide clearance
Inspect each valve for bending, burning, scratches or
abnormal stem wear.
Check valve movement in the guide and measure and record
each valve stem O.D.
SERVICE LIMITS: IN: 5.47 mm (0.215 in)
EX: 6.55 mm (0.258 in)
Measure and record each valve guide I. D.
NOTE
Ream the guides to remove any carbon deposits before
checking clearances.
SERVICE LIMITS: IN: 5.53 mm (0.218 in)
EX: 6.66 mm (0.262 in)
Subtract each valve stem O.D. from the corresponding guide
I.D. to obtain the stem to guide clearance.
SERVICE LIMITS: IN: 0.07 mm (0.003 in)
EX: 0.11 mm (0.004 in)
If the stem-to-guide clearance exceeds the service limits, de-
termine if a new guide with standard dimensions would
bring the clearance within tolerance. If so, replace any guides
as necessary and ream to fit.
TOOLS:
Valve guide reamer
IN: 07984-2000001 or 07984-200000B
J
U.S.A. only
EX: 07984-ZE20001 or 07984-ZE2000B
NOTE
It is important that the reamer always be rotated in the
same direction when it is inserted or removed.
If the stem-to-guide clearance exceeds the service limits with
new guides, also, replace the valves.
NOTE
Reface the valve seats whenever the valve guides are re-
placed.
9-10
(1) VALVE STEM