Honda C70 Manual

							 
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HONDA

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lame:
 May,
1980
 35

EIHDNDA
 MDTCIH
£26.,
LTD_  
						

							 
FUEL

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ETHCINEIA
 MOTDFE
C'O.,
LTD.
 E

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 %

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F“
 4.

FUEL
 SYSTEM

SERVICE
 INFORMATION

THDUBLESHCIUTING

FLOAT
 END
JETS

FLOAT
 LEVEL

tmneuneton

nemowu

THFIDTTLE
 vnwe
DISASSEMBLY

BAH
 B
UR
 ETCIH
 ASSEMBLY
 4-1
4-1

-1-2

4-2
4-3

I-4
I-5
 THROTTLE

VALVE
ASSEMBLY

UAFIBUHETDH
 INSTALLATION

FUEL
 STFIAINEFI

PILOT
 SCFIEW

HIGH
 ALTITUDE
 ADJUSTMENT

FUEL
 TENN
 -1-5

4-6

III--E»

4»-T

4-8

4-El

SEIWIEE
 IIIFIIIIIIIITIIIII

GENERAL
 INSTRUCTIONS

I
 Use
 caution
 when
working
 with
gasoline.
 Always
work
In
I
will-vlmllntfld
 mun
nrtl
um?
 Ifl-In‘-I
tpflrili
 DI‘
Opflrl
 f|il'I‘HI!-

I-
 '|".I'h-on
 dlnsmmhling
 Iunl
Ilfsllrlfl
 nl;||'l:_
n-mu
lho
loonllunu
 of
me
 D-rlnqa.
 Fieoluoa
them
with
new
onui
 on
rnaisefnbly.

I
 The
 float
 howl
has
a
drain
 ol-u|]
that
I:-an
be
lo-oennod
 to
clrlirl
 rcslcbunl
 qnmlirln.

TDD
 L

Common

Float
 ga-up

$.l§§LEI§+‘l\T|D"5
 -
 UT-I-I11-IHIIEIIEHII

‘.F§."1
 __
1§§1._-

Venmrl
 die.
 14
mm
 IEIL55
 inl
 ‘hi

_"=.‘fF'.'!‘lI.'F?3'il“_‘!"'
 N
 P'B-‘E211

PEIIIEC

9:-

Float
 level

1Iil.T
mm
{EH2
 inl
 ‘ii

Maln
 iet

5-low
 put
 _

___
 IE‘
 *3“

#35
 -i-
_

Throttle
 valve
 _

-___
_

#15
 . 

-.|It
 needle

Thmttla
 -gripfrom
plw

Plim
 mrew
 |n|1|.l;|l'
u|:eni|1g
 TEA

1'26

1"—Bn1rnI‘l.l'El—‘Il'-IIIHI
 ‘T

Seepuge-L
 II
 -I-i—

TRIIIIBLESIIIIIITIIIII
 En-pin:
 uranlu
but
won't
 run

1.
 No
 fuel
 In
tank

2.
 No
 fuel
 to
carburetor

3.
 Ertgifll
 IICIDGHBI
 'I\I'i'II"l
Full]

4.
 No
 spark
 at
olug

Ilgnition
 m-alfunotlonl

E.
 Air
 oleaner
 clogged

B.
 Intake
 al-r
hank

7'.
 I-m12Il'fl|Jfll‘
 dtoltn
opnratlon

B.
 lrnrlropur
 throttle
on-erntlon

Hard
 Illrtlng
 II
llailinq
 liter
nuflrq

1.
 Improper
 chain
operation

2.
 lgnilion
 maliunotion

3.
 C-arbu-retor
 rnalfumtlun

4.
 Fuel
 oontmuirumd

5.
 I|1I.BIt1&
 alr
leak

Fl.
 It-He
 speed
 incorrect
 Ftnunh

HI:

1.
 Ignifiorn
 mlllunotlun

2.
 Idle
 speed
 innorr-not

3.
 Carlzurfltur
 rnalfunctloo

4.
 Funlconlirnlmrted

l|'i|firin|
 dturlng
mobliurnicn

I.
 lqnltlnn
 malluncrlon

Bldtllring

I.
lgoltlnn
 madfunotlon

2.
 Carhurntor
 nt-ulfuottiorl
 ,

1.
 Clrnggtd
 alrleti

"'5'
 |!"'“l"'""'3'I*
 I'H""*u“"I'I
 1
Faulty
 float
veliue

I'll
 P""l"I|1l|
 l°""|"5""\"
 3.
Flr;-.111
 value
tun
lugh

1-
 Fuel
 witel"
 M9986
 4.
chum
 mm:
closed

2-
 |El"i|5|1"
 ""|"""|'=""'"
 5-.
Dirty
 air
odeaner

Llln

milturl

I.
 Clogged
 fuel
iuti

2.
 Faulty
 flout
value

3,
 Float
 level
low

-I.
 Fuel
 up
vent
 |.1lm-.Iu:=!

Er.
 Fuel
 etrainer
 screw.-n
clogged

B.
 Flestrlotocl
 fuel
line

7.
 Intake
 olr
leak

B.
 Air
 1-unttuhn
 nlomnd

Rich
 rnhttllrl

Date
 of
Issue:
 May,
195]

I3!-I€.lP-IIII-'5.
 MDTDFI
GU
.
LTD
 41

4-
11  
						

							 
.-

—._‘_

HONDA
 I.--"

FUE
 L
SYSTEM
 BTU
~.?;E,x,.-

I_

BIIIBIIHIETIIII
 III-II|Il]\'lll
 Toe
ao|_Ts

|.:rr'
 |l1e
iuel
 ~.'al'.'e
 DFF.
 T

Dr;
 in
rg5i|;I||.:I
 Iunl
Into
 a
oont.a5rIer
 bv
l
						

							 
/'

I-Ionrna.

~;§.:.j,»l
 cm

If-\_

.-Ft--I
 I'Iarr'oI.'r~
the
ncaoln
 alio
Petr-I"-er.

Fl
 FUEL

SYSTEM

TI-FFI-OTTL
 VAL

emoue
 the
iet
needle
 anrl
ciip.

lr‘.5CE|3t
 the
Ihnzrllle
 value
al1r;l
jel
"‘IEElIIH'
 l1:|r
rI|rl_

H"-r-ntchn-r.~
 or
weer.

IF
 E

II
I
I II

‘II-—’—_
 .-.;-gt’

P-
 ,r"'f
ll
I

M"-"
 /

'

JET
 NEEDLE
 |

NEEDLE
 our

FI.IIl\'I'
 MID
JETS
 FLICIAT

F
LCt:\T
 P"|I~l

Remove
 the
float
 |:I|ernt:ar
 am-I
null
 |;;-ut
the
flgat
 pi;-|_

Fh'Imrwa
 the
float
 and
-‘Ioa:
 valve.

.r"~

"JP-L

lot:-aot
 the
float
 vulva
 and
'iE‘=El1
 For
r|roo~aa.
 nicks
or

elepuaita.

Ins-pact
 the
float
 t'al'.'e
 ooeration.

1'-‘\

,,_
 J

I.

I

1+]
 -"I1-I

ir.-"
 1'

ft‘-fi.I
 ._'1'J."

.
 I
1'
 erg?"

~f-
 ‘ti

"
 I
'.

I
 I‘!

FI.DP1.T
 ‘I.-‘P-.l.".1'E

Date
 of
lsaua;
 Ma-v
I93
 .

FLUPIT

I
 D
 I13
_

'-EHDNDA
 MDTCIH
L'l'U..
LTD.
 ‘q"E

NEEDLE
CIJF

-__...r."

£-

RETAINER

4-3  
						

							 
FUEL

evetem
 CTU

I-Ionana.

F--"=-.“~
|.L'|-'-

-\-PI‘

I_
 _

Remove
 the
main
 jet.
needle
 jet
holder
 and
needle

jet.

The
 stow
 air
get
eannot.
 be
remoued-
 It
is
a

ores:
 fit.

Blow
 nil
Iete
 end
buoy
 omflflgflfi
 with
camera-wed
 alr-

BARBURETIIII
 IISSEIIIBLY

Install
 the
|'||:l:|:lI:
 |et_
needle
 jet
holder
 and
fl'lBil'I
 FET-

Ineiitll
 the
float
 and
line:
 I-naive
 ta-getl'|er-

NOTE

r 
 it

Tel-te
 care
not
to
damage
 the
ieti
when

inetalling.
 NEEDLE

JE
T
H-OLDEFI

FLOAT
 1.
MAIN

JET
 Sl.C|'\II'
JET

I
 /

I

NEED
 L
E
 JET

MAIN
JET

PIN

4-4
 N

Date
of
Issue"
 Mev,
IBBCI

IEHDNDA
 MOTOR
CCL.
LTD.
 ___

.—.

.---,
 1""-I
 '\.  
						

							 
I-:t:::%n.a.

FU
E
L
 SYSTEM

FLINT
 LEVEL

Flemcrve
 the
floltt
 tilfllniilfl

Measure
 the
float
 level
'n'itI'l
 the
flan!
 Illa
II-Lit

:|;||'|tI|;.'H|1g
 the
Iluat
 ualve_

FLOAT
 LEVEL:
 10.1‘
rnrn
Ilhti
 lnl

flgplglx
 the
fleet,
 if
lhe
 Iloat
 Laval
Ia
not
 wifltirl

lpEGII‘Il'.'.B1II0l'I.

TIIRIITTLE
 HUIE
ISSEIIBLY

Install
 the
olilp
 on
the
 jet
neelrie.

lnmlll
 the
lot
nlmlla
 lnm
the
throttle
 valve
and

demo
 It
vvlth
 the
rl-eedl-a
 clip
FI'lIiIi"lIl’.

NOTE

i
 the
 throttle
 valve
bottom.
 FLOAT

LEVEL

III
 '?n'll'l‘l
 I042
Inl

Cl?-ll-CI1
 DUIMIIIIIII

Install
 1-he
huadl:
 ellp
retalnul
 to
lt
mt:
 an
 I
I

E‘:ol-npresi
 the
1:I'lrot:tIa
 vellra-toting
 and
lnltall
 the

l:lll'.|Ie
 lnta
the
valve.
 NEEDLE

CLIP

Date
 of
lame:
 May,
IEIBIJ
 _
 _

!E'HONOA
 MOTOFI
C11.
LTD.  
						

							 
1-Iotstna.

FUEL
 evetem
 BTU
1,
-

'-_
 _-

Illllfili
 lI'|u
1|1rr!l|[I|:
 valve
with
1Ifll!
lttr-::|t||ef:
 ‘rnlvtt

oroove
 all-;|ne-cl
 wittl
the
tllrottle
 stop
so-revv.

IIIIIPIBIIIIETIIII
 IIISTIILUITIIIII

The
 lrateiletion
 sequence
ls
essantlallv
 the
reverse

of
 rel-noual.

I‘-IOTE

lo
 __

"\'ii’*Bfl
 -Itfitnli-rlg
 the
throttle
 l|'IIve_
QIFHT-l
the

li'lr'nItl:
 valve
l}I'|I|O't'E'
 with
the
throttle
 $!||:|p-

I|CI'LI'|I‘|
 .

-
 Cramp
 the
1-.l-I-ollre
 oe-ble
and
on
the
 ca
ble
 clamp,

Perform
 the
lullmvlrlg
 Ihepnfllldfls
 and
arlgualrneltu.

-
 Throttle
 operation
 ll:-age
3-3|

'
 E&rI':|.lre'lr:lr
 |:hltI-te
l:tJ.ng:
3--‘III
 CHOKE
CABLE
I

'
 Carburetor
 Idle
soeed
 -loaqll
I3
IIJI

FIIEI.
 STRMIIEII

Turn
 the
Iuel
 valve
 OFF.

Dlalrl
 the
l;iIl‘L'l.IfI-“IIDT
 hv
lrloetrnlng
 the
rirelrl
 sl:re\v-

Hemove
 the
fuel
 value,
 O-ring
 erltl
seralnar.

Clean
 the
strainer

Install
 Ihr:
olmlrver,
 If]-rirllg
Illl
Iu|:I
 valve.
 THFIOTTLE

'u'.\!IlI.‘u'E
 T

OI-IO-O'v'E

THFIOTTL
 E
STOP

SC
 HEW

Cl-H
 I‘-IE
 FUEL
STFIAINEFI

4_6
 as

Date
of
Issuer
 Mav.
IHEIU

l'l5.l
 PIUNDA
 IJIOTOI-ICO.,
LTD.
 o-.,

.-"I-.

_,.|-|_  
						

							 
|I"lI-t

r-L

Ir

I’-‘~.

F“
 F“

F‘

r-.

f"‘~.

F‘
 |,.v""_
 .

1"“-
 I-IcE%na.

F
Ll
 E
L
 SYSTEM

Fll.ll'l'
 SCREW

HEMUVALi'lN5TALLATlDN

NOTE
 The
 |J=i|DT
 ecnuw
 ls
lento":
 on
W1
="r-F
 fl1fl'Hlfl

not
 lg
rqrnmlud
 unrest
the
oathurttflf
 ll
UNIT-

_
 hau
 lod-
 _
L

Remove
 the
carburetor.

Remove
 the
flout
 chamber-

Torn
 the
pilot
 screw
 in
ind
 lawfully
 mount
the

numkpr
 -;tl
turn!
 hniluré
 it
wea'r_s1ight1~,~.

Hal-to
 i
nut:
 nf
this
 l|.'|
ul-E
 -11-
1
relererioe
 when

installing
 the
pilot
 5|:-raw.

CAUTION:
 Darnoge
 to
the
 pillor
 screw
 and
roorwlllooetor
 I

if
 the
 pillar
 :‘:'NW
 ts
rlglarmed
 mrbut
the
marl.

Hemflvfl
 i|‘|E
lilil-U1
 screw
 \n'lt|'|
the
lin1:t1|r
 mp
it-

inched-

C.»\'\UTlU'N:

I
 Any
 fomgole
 ortnmtlr
 Jo
remote
 the
p1'l=r.|I

|
 """""
 “"""""
 "P
“ii
i”T“"i‘Fi‘.@‘i*.3“""“""

Inspect
 thl
pilot
 Ioruw
 for
-I-lint
 and
rnplflne
 ll

neoessarv.

In-rtall
 tho
pilot
 sum
 Ind
return
 it
to
 It-1
 origlnn-I

potltlon
 u
noted
 nlutlng
 re-rn-oval.

Purfonn
 pilots-or-aw
 edluttrnlntif
 anuw
pilot
|I:rl=‘w

limstallecl.

HDTE
 DD
 HUI
 il'|!-‘till
 El
iimitpr
 i;p|;|
un
|
|1q-w
 pllut

Htruw
 until
aftlr
 idiustmont
 ha:
been
 mid:

lie-a
 helowl.

ADJUSTMENT

NQKTE
 .

'i=l'|o
 nilot
 new
 it
hiztorv
 pro-sol
and
no

5d|u5‘|;|'r||nl
 is
nEtEl5Bl"|'
 unlos
the
pilot
 scruw

I:
 replaced,

Tum
 the
pilot
 suew
 olooltwise
 until
it
teat;
 llghtlv

and
 hick
 it
uul
 to
the
 specification
 given.
Thin
I:
in

Initial
 setting
 prior
to
Th:
 llnai
 pilot
 screw
 ndiuw

mont-

l|\IlTl.|l|.L
 DFENING:
 ‘IBGD
—
I
turns
 out

‘EH31
 —
2
‘H2
 turn!
 out

if
 the
 pilot
 screw
 is
riekrencki
 opmlnir
N41‘
mt.

C|fl|.'i:lTiONI

_
 __
__

|%['!flr;q;;|§\;
 ml
H31,"
 p|'I|'_rt
 .\1",|'£l|\*
 flifl
MEI
 ‘l-\-‘I11.
O\£'£1l!‘—‘

Warm
 the
|:ng.|.l‘1E
 up
to
operafino
 lnmperflmtil.

Stop
 and
go
riding
 for
IEI
minute:
 ii
s1|llicHirl-T-

Connect
 u
to|:-'l1I:|n'|I=tI=r-

.I'4.|:Iiult
 1he
IIIHE
speed
 with
the
lhlottle
 flop
www-

IULE
 SPEED:
 1,5!!!‘
iflflrpm

Tom
 the
pilot
 arxew
 |n
or
 out
 to
obtain
 the
hiuhflll

nnglne
 =pn-url

Ha-adjust
 the
'~|;ll|::pBEI1
 to
1,511!
 i
HID
 r|.-rm,
 uemg

the
 tltrottle
 stop
-so-rew.
 PILDT

SCFIEW
 WITH
LIMITEH
 CAP

FLOAT
 Cl-{AME
E
H

Doteof
 issue:
Mn,
THBD

IEHOI“-IDA
 MDTUR
El.'l..
LTD-  
						

							 
HONDA

[/

FUEL
 svstem
 fl]l[|
/»'
-~.

LiMiTEH
 CAP
l|"~iSTfl\Li_o'J\TiUN

if
 the
 |J-iiflt
 sore-at
 ii&5
beeit
 li:|'_|lei:ir:d_
 3
new
 limiter

-BB1‘-‘I
 rI1~=ll
 |-1|r
installed
 utter
pliot
 screw
 soiluetment
 it

completed-

After
 atliustmerit,
 tzment
lhrr
limiter
 eeo
over
 the

Diiu-I
 !n’:tr:w.
 using
LDGTITE
 FEI
#501
 or
equiunlent.

The
 limiter
 |:=ep
shouitl
 Lt:
pinned
 isgeirm
 51;;
5t|;|p,

ore».-enring
 further
udiuetment
 that
would
 e-nrioi-i
 mi:

fuel
 mi
rtture
 ilimiter
 mp
position
 pqri-him
|;I|J{;ii;wi55

rt-I1-Btl~::n
 mti
prevents
 counterclockwise
 rotetionl.

MUTE

'
 A
pilol
 strew
 iimiier
 cep
Inuit
 be
installed.
 It
J

i
 prevents
 misseilustment
 that
eoulti
 |:lLl5e
pour

,
 peiforrmnci:
 Bod
|rlttrt:t|H:
 emissions.

HIGH
 .\i.'i'iTl.|l]E
 IiI1iliSTllEliT

For
 suetsined
 high
altitude
 operation
 [above
2,000

I‘I'|."E.5lIi
 i'I|'
lmtn-ll
 s
I535
 main
 let
an-r.i
 reridiuttlsiie

speed.

RHH-flu‘!
 the
fllrifiiunetiir
 irtaln
the
Iinqme
 sntl
rrrni-eve

the
 flout
 I;i1smi:|er-

Fliepisce
 the
standard
 tnsin
int
with
 the
high
 B11i’rlJEiB

#35
 rnsin
 ist.

Assemble
 tH‘|lLi
imtsii
 the
oar
iJLlr!trJt.

-'\I:i,|l-1:!
 Idle
spurt
 1|!
1.500
 1
IUD
 rpm,
 Lrtinp
 the

throttle
 itoo
screw

CAi..i_TiC_il'Nr
 '
 Stilt-rn'irrcti'
 anterior:
or
eir1!r.w.fe.i'
 in-war
rim:

T-55!?‘
 HI
|'-i.Ut?i'-'
 fh
v-iltil
 riir
Irtgii
 erl't‘|'i‘rm‘e

mil-bi
 In
.I'rt.'i'i‘.-r-li5rtri'
 me'_v
reuse
 elrgirie
 ¢.|ver.||.rer-

rieg
 om!
 oiermrge,
 For
.-ru-rr.e.|'r1eo‘
 r:-_|-,\er¢m'|;i-,1-,1

below
 I
.56'i.1
 m
|'.?.rh'J-‘.1
 _i"r_.l_
roiettofl
 rim
!'I.e'.re:l'-

ertl
 win
 fr:
strrd
 nsro',|iu'ir
 mu»:
speed.

i
 smneaie
 High
i=|mue=
 t'|'DtI

.
 3
 MO
 rn
 1.500
rn
(5,000
 tri~

i
 i6.5Elfl
 ftil
max.
 min.

Main
 iet
 man.
.u-en
 #35

'
 1981-
was

ilctl:-toned
 1.5001
l0ETr1=rn
 -e

he
 ..=...;;.'
 '
 -

iupening
 Faittuqg

pt:-not
 oi
-_
_-

i

4-B
 Lli'|iITEFl:

CAP

J

Date
 of
imm:
 H-iv.
‘I990

fiH[IlT\ilIiA
 MDTDH
G-‘DH
LTD.
 -|—._

ET
 ..-_