Front Cushion - Honda CB450 1968 Service Manual

4. 3 FRONT CUSHION
71
NOTE:
If the handle bar pipe under holders are to be
removed, it is recommended that the l O mm hex
nut on the pipe holders be first removed before
removing the handle bar. This is to prevent
pipe holder from the turning. (Fig. 4. 14)
C.
Inspection
1. Inspect the fork top bridge for cracks or other
damages.
2. Inspect the handle bar cushion rubber for
damages and wear .
D. Reassembly
1. Mount the fork top bridge on the front fork,
install the front fork bolts, steering stem nut and
tighten the 8 mm locking bolt.
2. Assemble the handle bar according to Section
4. 1 D above.
3. After completing the installation, check to
make sure that the headlight and the turn signal
light are operating properly.
4. 3 Front Cushion
A.
Construction
The front fork must not only absorb the vertical
shock caused from the road conditions but must
also be able to sustain the horizontally applied force
resulting from the steering function. The suspension
and damping components directly influence the steer-
ing characteristics and stability of the motorcycle.
The bottom case is made of aluminum to reduce
the weight of the front wheel assembly. (Fig. 4. 15)
l.
Operation
The front cushion of the CB 450, CL 450 is
a telescoping damper type with the externally
assembled spring accepting the compressive load
and the rebound extension being dampened by the
hydraulic damper.
(Fig. 4, 16)
Hydraulic damper functions in the following
manner. (Fig. 4 . 16 C)
( l l When the frame load is recieved, the fork
pipe
CD
attached to the piston
@
drops and
compresses the oil in chamber "A".
(2! The compressed oil in chamber "A" passes
to chamber "B" through the orifice s "a" located
around the fork pipe and lifts the valve
®·
I
Fig. 4. 14 Removing handle bar under holder
CD
Handle bar under holder
®
10mm nut
L___ _
- -- ·- - - - - -,~ -------i
Fig .
4 .
15 Fron t fork assembly
(i)
Front fork pipe
(2)
Front fork bottom case