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6-3-6
STARTING
PULLEY
and
FLYWHEEL
(magneto)
Remove
3
pieces mounting bolts to detach starting
pulley from flywheel.
Remove flywheel from crankshaft.
Insert a socket wrench
or
box wrench into an
18mm
nut, and give the wrench a sharp blow with a soft
hammer. Remove nut and spring washer.
Attach flywheel puller to flywheel as shown in Fig.
6-3-1,
and turn center bolt clockwise until flywheel
becomes loose enough to be removed.
Disconnect high tension cable
of
ignition coil from
spark plug, disconnect cable clip from crankcase, and
Fig.
6-3-1
then, remove ignition coil from crankcase
(6mm
X
25mm screw
X
2).
Remove cable clip from lighting coil cable, and detach lighting coil from crankcase (6mm
X
30mm screw
x
2).
Remove breaker cover, and then remove contact breaker and condenser from crankcase.
In reassembly
;
Refer to “7-2 BREAKER POINT ADJUSTMENT” and
“7-3
TIMING ADJUSTMENT”.
6-3-7
CYLINDER HEAD
and
SPARK PLUG
1)
Detach spark plug from cylinder head.
2) Detach cylinder head and gasket from cylinder by loosening lOmm nut.
In
reassembly;
1)
Remove carbon from combustion chamber and also remove dirt from the vicinity
of
cooling fins of cylinder head.
-
Check head face for distortion. Replace cylinder head, if needed.
2) Replace gasket with new
one.
3)
Clamping torque
of
cylinder head
is
450-500
kg-cm (32.5-36 ft-lbs).
NOTE:
Leave spark plug detached temporarily to facilitate engine rotation during timing adjustment. When mounting
finally, tighten
it
250-300
kg-cm
(18-21.7
ft-lbs).
6-3-8
INTAKE
and
EXHAUST VALVE
CA
1
Detach inner and outer tappet cover from cylinder
block
(6mm
bolt
x
2).
Detach retainer locks and valves by Lifting valve spring
using
a
valve spring retainer. Proceed in the same way
both for intake valve and exhaust valve.
(Fig. 6-3-2)
Then, remove valve springs and spring retainers.
JTION:
DO
NOT DAMAGE GASKET SURFACE
OF
TAPPET
CHAMBER
WITH
THE
COMPRESSOR
TOOL .
Fig.
6-3-2
-1
2-