Honda C77 - POINTS OF CONSTRUCTIONAL DIFFERENCE BETWEEN HONDA 250, 300 MODEL C72, 77 AND CB72, 77.

CONTENTS
1. DIFFERENCE BETWEEN C72· 77 & CB72 . 77
A.
Engine
. ... . .......... ... ........ . . ..... . . . ... . .. .. ...... . .
B. Frame ....... . . .. · .• ···· · •· ··· · • ·· ··· · · ·•··· • •····• · · ···· · ··
2. E NG INE
A. Main Parts of Engine ...... .•• . . . • •. ... ••.... . . .. • .. . .. . .....
B. L ubricating System .... . .. . . . • ' .. .. .• • . .• •. ... •....•. . ..•• . ..•..
C. Ce ntrifugal Oil Filter . . . .• • .•.. . . . ···••··· ···•·· •·· . .••. . . . . . . .
3.
POW ER TR ANSMISSI ON
93
93
95
97
99
A. Clutch and Primary Chain. . . . . . . . . . . • . . . . • . . . . • . . . . • . . . . • . . . . .. 100
103
T r ansmissi'On Sys tem . .. . ... . . ....•... . .. . .. .. .......... . . .. . ..
B.
C.
4.
5.
6.
7.
e.
Final Drive Mechanism
AUXI LI ARY PART S
A. Funnel T ype Br ea th er
B. Kick Starter Mechanism
.. ..... . .. .. ........ . .. ....
... . .. ...... .
.. . .. . ... . .. .. , ..... ... .. . ... .. .. ... .
.... .. ... .. .. .. . ... . .... .. .. .. . ..... ..
C. Cam Chain Tensioner . ... . . . . ......•. .. • •. . . .. . . . . . ..•••.. • ..
CARBURETTOR
.. .. .. ..... . .. ....... . ... ... .... .. .... . . .. .. . ' . .. ... .
FRA ME . ......... .. . . . .... .. . .. ... . . , ... ... .. . ... . . . .. .. .... .... .
SUSP E NSION
A. Front Wheel Suspension
.... . . . ....... . ... .... . .. . . ..... ... .. .
B. Rear Whee l Suspension
... , .. .. ...... ... . .. .... . .. ...... .... .
S TEE RING SYSTEM
A. Handle .. ...... . . .... ... . . .. ............ . .... .. ... ...... . . .
B. Steering .... .. .. . . ..•.... .• • . . .. • . . ....•... • ... . .. . . ... . ....
9 . . BRAKE I NSTA LL ATION
10.
1 1.
W HEEL
A. Fr ont Wheel
B. Rear Wheel
. ... .. .. . .... . ... . ... .. .. .. .
.
.... . . .. . . .. . .. . ...
.. .. . . .. . .. .. .. . ..
. .. . .... . .. . .... .. . .. . .... . .. .
AUXILIARY EQUIPMENT
A. Ai r Cleaner . .. . . ...• ... .. .. . .......... . .. .. •. .... .. . .. .... .
B. Muffler ........ .. ..... . .. .• · · · ···· ·· ·· •... ... . ..•.... . . .. ..
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109
110
110
1 1 1
11 3
118
1 20
1 21
123
124
1 28
129
131
1 32
CONSTRUCTION
1. POINTS OF CONSTRUCTIONAL DIFFERENCE BETWEEN HONDA
2S0, 300 MODEL C72, 77 AND CB72, 77.
Honda 250. 300 sup er sport Model CB72. 77 has a newly designed chassis equipped
with engine which
partly reconstructed fr om those of Mod el C72. 77. and aimed mainly
to be used as spor ts car maintaining availability as racer interchanging some of its par ts .
As this engine is high rotation. high power type and chassis is light weight. high rigidity
type. the special constructional featurer comparing with Model C72. 77 could be cited
as follow.
A. Engine
1. T win carbur e tor
To raise horse power adopted Twin carburetor system removing iunction of suction
manifold.
2. Reciprocating change
Change control system suitable for high speed running and ra cing.
3. Kick of for wa rd step
ConSidering relation with frame. direction of step of kick arm was set forward.
4.
180 de gr ee (I-Typ e) cr ank angl e
To get
stabil ity at high speed r ed ucing vibration left and ri ght crank arm angle was
set as 1 80 degrees.
B. Frame
1. Frame and rear fork o f steel tubing
To attain
light weight and raise rigidity main constructional member is constructed by
high carbon ste el pipes.
2. Telescopic type fork
To raise stability at hi gh speed running on rou gh road maintaining rigidity. Telescopic
type fork was adopted on the front
wheel suspension.
3. Rear cushion of thr ee step ad jus tment
Rear cushion is adjustable according to load a nd road condition.
4. 1 B in
ch ty pe
To
enlarge bank angle and to help pleasant feeling
front
wh ee l 2.75- 1 8. and rear wheel 3.00- 18.
93
on rough road. equipped with