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3.
5
UPPER AND LOWER
CRANKCASE
d.
Allow
the liquid
packing
to set before
joining the two crankcase halves.
2.
Route cam chain
over
the camshaft and tem-
poraly
set.
3.
Assemble
the
lower case.
4.
Handle the
starting
motor
cable
and dynamo
cord
with
care
so
as not to damage
the
clamps ; tighten the
nuts.
F.
Crankshoft
Construction
The crankshaft is constructed of high
strength
carbon steel and together
with
the connecting rod,
converts the reciprocating motion
of
the piston to
the rotary motion and,
in
addition, performs
function
of the
flywheel
by absorbing the fluctuating
torque.
On the crankshaft,
starting
sprocket and
the AC
generator
are mounted.
The cam
chain drive
sprocket
is mounted and
located
in the
center
between
the
two
throws.
(Fig.
3. 96).
The
oil under pressure is
routed
to the
four
bearing
from
the upper crankcase
to
lubricate
the
roller bearings.
(Fig.
3. 4,
3. 93)
The
oil
to
the two
center bear-
ings is further routed to the center
oil
passage in
the crank
pin
to lubricate the large end of the
connecting rod
(Fig.
3. 97).
Grooves
are provi-
ded in the oil passages
to
function as centrifugal
r,lters.
The crankshaft is supported at four points by
heavy duty roller bearing; the
outer
race which is
made of high carbon chrominum bearing steel
(SUJ-21
for greater strength and service l_ife, ore mounted
in place with dowel pins.
Further, main bearing
ore held in place by main bearing holder cap,
the right and left crankshaft, counter weight, center
crankshaft are individual
·
parts press fitted to make
up the crankshaft assembly.
It
is therefore possible
to
use
the
roller bearing in the connecting rod
large
end
and also in the main bearings.
The
crankshaft balance
which
is so important in
providing riding comfort, has been designed to
a
balance of
44% +3-.,-5%.
(CRANKSHAFT BALANCE)
The balance "A"
is computed by the following
equation : A= m/M X l 00
m :
Gyrating mass (m
is
the unbalanced obtained
by subtracting the mass of the crankpin and
the connecting rod from the total weight
of the counterweight.
Fig. 3.
96
Crankshaft assembly
Fig
.
3.
97
Sectional view of
the
crankshaft
!Right
sidel
(D
Wosher
X
FR
y
y
z
z
X
Fig.
3. 98
Crankshaft balance
47
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