Valve Guide Replacement; Service Limits - Honda CH250 Elite 1986 Service Manual

NOTE
VALVE GUIDES
a
ball
guage
or valve guide
I.D.
to remove any carbon build-up before
Subtract each valve stem
O.D.
from the
cor're~)ponding
LD. to obtain the clearance.
SERVICE LIMIT: 5.03 mm .(0. , 98 in)
MeiaSILlre and record
inside micrometer.
CYLINDER HEAD/VAlVES
NOTE
NOTE
stEim-to-auide clearance exceeds the service limits with
the valves also.
new
• If the clearance exceeds the service limits,
determine if
a
new with standard dimensions would
the clearance within tolerslnce.
If so, replace any as necessary
SERVICE LIMITS:
IN 0.08 mm 10.003 in)
EX: 0.10 mm
10.004
in)
• Reface the valve seats whenever the valve
6-10).
are re-
• Do not use a torch to heat the cVj'imter head; it may cause
Support the cylinder head and drive out the old guides from the
combustion chamber side of the head.
or
gloves when haJ'uiling the heated • To avoid burns, wear
ru!J,nn,'r
head.
CAUTION
Heat the cyliindl6r head to 100°C {212°Fi with a hot
oven.
VALVE GUIDE REPLACEMENT
6-8