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3. 1
ENG I NE
A.
Construction
It
is
no exaggeration to state that the quality of
the engine reflects the superiority of the motorcycle.
An engine that is light
in
weight, compact, and
having
a large power output is a desireable attri-
bute, however, the engine must have a well balanced
appearance which matches the frame, in order to
produce a perfect motorcycle.
This model was designed to fulfill this aim by
employing
many
new ideas and the latest in tech-
nology.
The fruit of the effort is reflected in the
motorcycle of high performance and a beautiful piece
of machinery much sought after by avid riding fans.
Features such as the twin cylinder double overhead
cam, torsion bar valve
springs
(which eliminates
surg-
ing
during
hig
h speed), and a regulating mechanism
featured
with
an eccentric cam follower shaft which
practically eliminates tappet adjustment, are typical
of the revolutionary
features of this motorcycle.
Also, the
system of
seven guide rollers suppresses
the chain noise to the level which is unnoticeable;
extra heavy duty bearings at
the
crankshaft and the
transmission, and the dual oil
filtering
system in-
corporating
both the centrifugal
and the filtering
mesh to enhance the durability and the long econo
-
mical life of the
engine.
The two variable venturi
system of the CV carburetors
assures
uniform fuel
mixture
independently to
the respective cylinders to
provide smooth power
output
at all
speed
ranges.
We are proud of the engine's responsive accele-
ration and
its
high fuel economy.
Power
Transmission
The sequence in the
generation of
power and its
transmission to perform useful work at
the
rear
wheel
is as follows :
Combustion
-
piston -
connecting rod--
crankshaft-primary
drive
gear-lprimary
driv-
en gear) clutch
outer-seven
friction discs-
seven clutch plates-clutch
center-transmission
mainshaft-mainshaft
gear-
countershaft gear
-countershaft-drive
sprocket-drive
chain
-rear
wh
eel. {Refer to
Fig. 3. 3)
35
fi g.
3. 3
Gear
ratio
Low
2. 412 141/171
2nd
1.
636
{36/
221
3rd
1.
269
133/261
4th
1.
000
129/291
5th
0.
844
127
/
321
Reduction ratio
Primary
3.
304 (7 6/231
Secondary
2. 333 135
/
151
13
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