Yamaha CS338G Service Manual
TABLE
OF
CONTENTS
CHAPTER
1-1.
1 -
2.
1-
3.
1-4.
CHAPT
2-1. Removing the engine
2-2.
2-3. Primary sheave
2-4. Flywheel
2-5. Carburetor
2-6.
2-
7.
2-8.
1.
GENERAL
Specifications
Service data
Construction
1-3-1.
1-
3-2
.
1-3-3.
1-3
-4.
1-3-5.
1-3-6.
Tools.
ER 2. E
Manual
2-2-1.
2-2-2.
2-
2-3.
2-2-4.
2-2-5.
2-
3-1.
2-3
-2. Cleaning and inspection .
2-3-3.
2-
4-1.
2
-4-2.
2-4 -3.
2-5-1.
2-
5-2.
2-5-3.
2-
5-4.
2-5-5.
2-5-6.
2-5-7. Main
Oil
pump
2-6-
1.
2-6-2.
2-6-3.
2-6-4.
2-6-5.
Engine
2-7-1
2-
7-2.
2-7-3Engine
. .
..
...
Engine
..
Power
transmission.
Drive
unit
Steering system
Chassis ...
Electrica l system . ............................... ...........................
NGIN
E
starter
. . . ... ............ ..
Removal ........... .
Disassembly . .
Cleaning and
Assembly
Installation
Disassembly ...
Assembly.
magneto
Removal ........... .
Inspection ....... .... ...
Installation
..
Removal ...
Disassembly .... .
Cleaning and
Assembly
Installation
Adjustment.
...
Removal
Disassembly..
Cleaning and
Assembly.
Installation
Disassembly
Cleaning and in
Assembly
mounting.
...................
............................................
jet
replacement
......
...
..
. . . . . . . . . ...
. .
.
inspection.
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...
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....................
inspection
. .......... .......................... .
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..................
inspection
...
spect
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3
5
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63
CHAPTER
3-1. Secondary sheave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5
3-2. Disc brake ..... ... .. ....... ............. ...... .........
3-3
.
3-4.
3-5.
3-6. Drive track
3-7. Chain
3.
POWER
3-1-1. Removal
3-1-2
. Cleaning and insp ect ion .
3-1
-3. Assembly ..... ..............
3-
1-4. Installation........... ........................ .. .....
3-1-5.
33-2-2.
3-2-3.
3-2-4.
Front axl
3-3-1 . Removal
333-3-4.
3-3-5.
Rear axle ........ ..... ........... ... .. .... .... ... ........... ...........
3-4-1.
3-4-2.
3-4-3.
3-4-4.
3
-4-5. In
Bogie wheels ...... .. ..............................................
3-5-1.
3-5-2.
3-5-3.
33-6-2
3-6-3. Installatio
3-6-4.
3-7-1. Removal....
3-7-2.
3-7-3.
33-7-5.
3-7-6.
Adjustments..
2-1
.
Removal ..
Cleaning and inspection .. .....
Inspection ..................
Adjustment
e..
..........
3-2.
Disasse
3-3
.
Cleaning and ins
Assembly
Insta
Removal............
Disasse
Cleaning and in
Assembly.
stallation .... ........
Removal
Cleaning and inspection ...................
Installation ........... ............. .. ............ ..
.........................
Removal ............
6-1.
Cleaning and inspection .. .....
.
Adjustment............................
housing..
Disassembly. . .............
Cleaning and inspection .. .... ..
Assembly
7-4
.
Installation
Chain
TRAIN
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adjustment
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82
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89
90
91
92
93
93
94
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98
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99
100
CHAPTER
4-1.
4-2.
4.
Steering
4-1-1.
4-1-2
.
4-1-3.
4- 1-4.
Ski .
2-1.
4-
4-2-2
.
4-2-3.
4-2-4.
STEERING
................................
Removal .................... ........................... .
Cleaning and inspection
Installation .. .. .....
Adjustment
Removal
Cleaning and inspection ............................ ........
Installation
Adjustment
(SKI)
..............
..............
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.................................................
AND
CHASSIS
.... .......
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103
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104
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105
105
106
107
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108
108
109
.109
4-3. Chassis and
4-
3-1.
Removal ...... ..........
4-3-2
. Install
4-4. Rider's
44-4-2. I-nstall
seat................................
4-1.
Removal ..
air
shroud ............................
...........
ation
...
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ation........
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110
110
111
CHAPTER
5-1.
Wiring
5-2.
Ignition circuit..
5-
3.
Ignition
Lighting
5-4.
CHAPTER
Hard
Poor
High
Troubles
5.
ELECTRICAL
diagram
timing
circuit..
6.
TROUBLE
starting
low
speed engine
speed
operation
at
both
...... ....
........
adjustment
.... ....
...............
low
SYSTEM
................................
............................
...........
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......
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....
SHOOTING
....... .... .
operation
problems
and
high
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speeds
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113
114
121
124
12
5
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125
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125
.
126
SOMMAIRE
CHAPITRE
1-1. Caracteristiques ......................... .
1-2. Donnees d'entretien................. ...... ............
1-3. Construction....... ....................... .................... .............. ........... ...........
1-4.
CHAPITRE 2. MOTEUR
2-
1.
2-
2.
3.
2-
2-4. Magneto
2-5. Carburateur .........
2-6.
7.
Moteur .. ....... ..........................
2-
2-7-1
2-7-
2-7-3. Montage
2-
8.
Montage du moteur .............. ........................... .
I.
GENERALITES
.......
... ......... ...............
..........
1-3-1
. Moteur .......... ............
1-3
-2.
Transmission de
1-3-3. Unite de commande .... ............. ..... .. .......
1-3
-4. Systeme de direction .......... ......... ......... ........ .................. ............... ...... ................ ....... .. ..
1-3-5. Chassis .......................................... ............................... ................................... ............
1-3-6. Systeme electrique ..................... ....... ..... .
Outils ....................... ............... ........ ......... ......... ......... ......................... .............. ............... .... ...
Demontage du moteur........... .......... ....... ............ ...... . .. . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 2 7
Demarreur manuel
2-2-1. Depose ............. ...... ......... ..
2-2-2. Demontage ..... ...... ............................... ........... .. ......................... .... ....... .......... .............. 32
2-2-3. Nettoyage et controle ...... ......... ..
2-2-4. Montage
2
-2-
5.
Installation ............
Poulie primaire .... .
2-3-1. Demontage ........ ............ ....... ..
2-3-2. Nettoyage et controle (Inspection) ... ................
2-3-3. Montage .... ............. ........ ........ ..................... ..................... ......... ........ ........ ................... 38
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Ia
puissance ..... ......
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a volant ....... ................. .......... ....................... ...... .................................. .. ...
2-4-1. Demontage .
2-4-2. Controle .... ........ · ....... ....
2-4-3. Installation .... ............. ........ .. ........ ........
2-5-
1.
Depose .
2-5-2.
2-5-3.
2-5-4.
2-52-5-6.
2-5-7.
Pompe a huile ............
2-62-6-
2-6-3. Nettoyage et inspection ..... ........ ................ ................ ... ... ..... ...
2-6-4. Montage .............. ......
2-6-5. Installation ............
Demontage ........................ ........ .......
Nettoyage et inspection ......
Montage ............................... .... ................... ........... ............. ..... .................................... 50
5.
Installation
Reglages ......
Rem
placement du gicleur principal ............
1.
Depose .... .. ...
2.
Demontage
. Demontage
2.
Nettoyage et inspection ....
.......
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22
31
33
33
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51
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62
63
70
71
12
14
15
15
CHAPITRE 3. TRA
3-
I.
Poulie secondaire ............... ..... ....................... ..........
3-1-1. Depose ...
2.
3-13-1-3.
3
Nettoyage et inspection
Montage ................... ..
-1
-4. Installation ......... ........... ..
3-1-5. Reglages ....
3-
2.
Frein a disque ....................
2-
I.
3-
Depose
IN
D'ENTRAINEMENT
....
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3-2-2. Nettoyage et inspection ... ...... ............ ............. ........ ................ ..... ....... ...... ........... ........... 82
3-2-3. Installation ..
3-2-4. Reglages ....
3-
3.
Arbre avant ....... ....................... ..... ........... .................. ..................... .... .............. ................... ... 84
3-3-1.
3-3-2.
3-3-3.
3-3-4.
3-3-
Depose ...........
Demontage .........
Nettoyage et inspection ..
Montage .........
Installation ................................. ............... ........ ... .... ........................ ...
5.
3-4. Arbre arriere ............. ..... .....
3-4-1. Depose
3-4-2. Demontage ...........
3-4-3. Nettoyage et inspection ......
3-4-4. Montage ............ .....
3-4-
5.
Installation ......
3-5. Bogies .... .... .. ......
3-5-
1.
Depose ............................... ..................... .... .... ... .. .................... ................. ........ .......... 93
3-5-2. Nettoyage et inspection ...... ...
3-5
-3
. Install ation .. ............................ ..........
3-6. Chenille .....
3-6-1.
3-63-63-6-4.
7.
Boitier de chaine .... .. .......... ..... ... .............. ......
3-
......
Depose ................. ... ........... ........ .
2.
Nettoyage et inspection .............. .......
3.
Installation ............... .
Reglage ... ........ .... ..... ...
3-7-1. Depose .... ......... .... ..... ....... ........................................ ....
3-7-2. Demontage ....
3.
3-73-7-
Nettoyage et inspection ... ......... .. ... ..... .............. ........................ ...................................... 99
4.
Montage ....
3-7-5. Installation ..... ............... ...... ......................... .. ....... ............ ...........................
3-7-6.
Reg!
age de
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Ia
chaine .... .................................................... ..
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78
78
IOO
01
CHAPITRE 4. DIRECTION (SKI)
4-
I.
D.irection .........
4
-1
-
I.
Depose ....... .................. .......... ..............
4-1-
2.
N cttoyage ct inspection ........... ........................................... ...................................... ......
.......
.... .......... .... ................ ........
4-1-3. Installation ....... ..... .... .....................
4-1-4. Reglage ............. .....
4-
2.
Ski
....
.....
.....
... ...
...
.. .
.........
4-2-
1.
Depose .....
....................
4-2-2. Ncttoyage et inspection ..............
4-2-3. Installation ........ .......... .... .... ...... ..
4-2-4.
Reglage ...
......
......
..............
..... ...........
ET
CHASSIS
......
... ........................ .............. ........
.......
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...
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... ... .......... .............
............
...
................................ ....... ................ 109
.........
.......
......
.......... I 03
................... ........ ............. 1 06
.....
....
.... .. ..
...........
...
....... .. .... ... .. ................. 108
..... ........... I07
.....
................ .
........ ... .................. 109
104
105
105
108
4-3. Chassis et capot ...... ............................... .......... ..
4-3-
1.
Depose ... ..
-3-2.
4
4-4. Siege ... .............. ....... ............. ..... .......... ..... ...................... ........... ......
4-4-1. Depose ..... .........................
4-4-2. Installation ....... .......... ........ .........
Installation .........
........
......... .... ...................... .
...................................................................................................
...................................
......
..........
...............
.... .. ....... ... ........... ........
....
............
...... ........ .. ........ ...
........... ....... ............... ..... ...... . 110
.................... .. ................. ...... .........
........
....
.......... .
................
......
....... .... ...... ......
............... .............. ...
.....
.......
.II
111
111
.II
.Ill
0
I
CHAPITRE
5-l. Scheme de ciiblage .......... ...................
5-
2.
5-
3.
5-
4.
CHAPITRE 6.
5.
SYSTEME ELECTRIQUE
Circuit d'allumage ......... ..... .......... .........................
Reg!
age de l'avance a l'allumage
Circuit d'eclairage ...................... .... ........... .
DEPANNAGE
Demarrage difficile ........................... ............ ....
Fonctionnement du moteur
Problemes de fonctionnement a hautes vitesses
Prob1emes a haute et
faib1e
...........
a faible vitesse defectueux ...... .......
vitesses ............. .. .. ..........
....................................
.................. .
.................
.......
.....
......
...........
............. ..... .......... ...
..........
......
... ..........
........
........... .............. ...... .. .......... .............. 129
......
.... ... ............. ........................ .............. .
.....
.............................
............. ... .. ............................... .
...
......... ....... .... ...
.....................
.........
...
..
.....
.........................
......... ....................
....
.............................. ... 124
..... ............ .... 129
..........................
113
114
121
129
..... 130
GENERAl
GENERALITE
CHAPTER
1-1.
Dimensions
Engine:
Starting
Track and suspension :
Transmission:
Frame:
Cowl
Seat:
Fuel
Front
Electrical:
Brake:
Throttle
Kill switch:
Accessories: Emergency starter rope. Service
Optional
1.
GENERAL
Specifications
MODEL
:
(w/ski
Length
Width
Height
Type
No.
of
Bor
e and stroke
Displac
Max. horsepower
Carbu
Lubrication
Magneto
system: Recoil hand
Track
Width
length
Suspension
Drive
sprocket
Wheel
Type
chain
Drive
Type
:
Type
tank:
Capacity
tank
Oil
bumper:
Headl
ight
Taillight
Stoplight
Ig
nition
Type
Control
:
Type
Type
equipment
s)
(w/windshield)
cylinder
ement
re
tor
system
output
on
ground
wheels
sprocket
capaci
ty
key
switch
parts: Tachometer and
96
33
38
Air-cooled
2
2.362 x 2.346 ins.
20.63
25 HP/
KEIHIN
"Autolub
Flywheel
Molded
15
39
12
Single polyurethane. 9
Single
Aut
Duplex roller chain enclosed in oil bath
Fabricated
Reinforced
Removable
4.5
2.4
Chromed
12V.-60/60W
12V.-8W
12V.-23W
3-
Disc brake
Handle
Handle
Push
.1 ins.
(2.440
mm.)
.3 ins.
(845
mm.)
.6 ins.
(980 mm.)
2-stroke
cu.in.
5.500
CDX42-38
e"
oil
magneto
starter
rubber. steel reinforced
ins.
(380
ins.
(990
rubber wheels. bearing
polyurethane. 9 teeth
oma
tic
centrifug
steel
fiberglass (removable)
US
gals.
qts. (2
25
tubular
position. on
lever.
lever.
button.
5-port
(60
(338
c.c.)
r.p.m.
x 1
injection
12V.-70W
mm.)
mm
)
al engagement.
(17
.0 lits.)
lits.)
steel
High-low
dash
left-hand
right-hand
right-hand
speedometer
operated
59.6
x
mounted
teeth
beam
operated
operated
GS338G
mm.)
. @
3.000
tool
r.p.m.
infinitely
kit
variable
3.5
1
~
1
:
: 1
- 1
--
GENERAL
GENERALITE
CHAPITRE
1-1.
Caracteristiques
Dimensions et poids:
Longueur (sans skis)
Largeur
Hauteur (sans pare-brise)
Moteur:
Type
Nb. de cylindres
Alesage et course
Cy
Puissance maxi
Carburateur
Graissage
Puissance du volant magnetique
Demarreur:
Chenille et suspension:
Chenille
Largeur chenille
Longueur surface portante
Suspension
Pignon d'entrainement I pignon en polyurethane (9 dents)
Pignon AR
-
Transmission:
Type
Entrainement
Chassis:
Type
-
Capot:
Type
Selle:
Reservoir de carburant:
Capacite
1-
-
Reservoir d'huile:
Capacite
Pare-choc A
--
Equipement electrique:
Phare
Feu AR
Feu stop
Contact
Frein:
Type
Commande
Accelerateur:
Commande
Commutateur
Commande
Accessoires:
En option:
I.
GENERALITES
MODELE
2.440mm
845 mm
980mm
Deux-temps, refroidissement
2
60 x 59,6 mm
lindree 338 cm
25
ch. a 5.500
KEIHIN
Systeme d'injection d'huile Autolube
12V-70W
Lanceur manuel
Caoutchouc moule,
380 mm
990 mm
I 2 galets caoutchouc montes sur roulements
I pignon
Embrayage centrifuge automatique et variateur
Chaine
Acier
Plastique
Banquette amovible
I 7 litres
2,25 litres
Tube d'acier chrome
12V -60W
12V-8W
12V-
23W
3 positions (au tableau
Frein
Main gauche, levier au guidon
Main droite, levier
Par
poussoir actionne
Corde de lanceur de secours, trousse d'outillage
Compte-tours et indicateur de vitesse
. -
V:
a cle
d'arret
---
d'urgence:
3
tr/mn
CDX42-38
a 3.000
a reenroulement
en
polyurethane (9 dents)
a rouleaux duplex baignant dans l'huile
usine
arme (amovible)
-
/60W
Feux de route et de croisement
a disque
X I
tr/mn
armature
debord)
au
guidon
par
par
d'acier
--
Ia
main droite
GS338G
air, a 5 lumieres
(3,5/
I
~
1/1)
2-
-
GENERAL
GENERA
LITE
1-2 . Ser
ENGINE
1------------------
Carburetor:
1
------------------t--
Oil
1--
---------------
DRIVE:
Clut
1--
-------------
Chain housing:
vice
der
Cylin
Piston clearance
Lubrication oil
(Recommended
Igniti on
Compression ratio
Idling
speed
plug
Spark
Model
Mai
n j
et
Opt
ional main
Pilot
screw
S
low
jet
Partial
jet
Fuel level
Valve seat
pump:
Minimum
Maximum
ch:
Primary spring
Secondary spring
V-belt
Sheave distance
Sheave
Oil
capacity
Oil
Reduction ratio (Drive ch ain
1-
sprocket/Driven
----------------+-----
Suspension:
Track
deflection
Brake:
Brake pad
Gap
between
BODY:
width
Ski
Data
MODEL
head
timing
(S.T.D.)
(S.T.D.)
(S.T.D.)
(S.T.D.)
stroke
stroke
offset
wear
(S.T
tightening
oil)
jet
chain sprocket)
limit
pad a
nd
disk
D)
torque
---
Nut
s:
16
0.0018 ~ 0.0020
1st:
YAMALU
2nd:
Another
"B
IA
With
dial gauge and
B.T.D.C. 1 5± 0 1 mm.
58:
1
6.
1
,800
±100
1':-J
.G.K. B-
-!
-----------------
KEIHIN
#14
#145 #1
1-1/4
#
60
#
70
0.1
0.07¢
--------
0
.008 ~ 0.009
0.06 ~ 0.0
0
96
+0
_0_
in.
7HS
CDX42-38
35 #130
.079.
(1.8¢
--l------------------
Part No.
Part No.
Part
Outer
10 63±0
02 +0020.
-~------
0.45
SAE 1
12/23
90501-45162
90508-35073
No. 820-17641-00
line length :
07
4
-
.
0.059
qt. oz.
OW/30
- -- -
0.
79 ~ 0.
0.04
in.
(1.0
0.
008 ~ 0.04
26.3
ins.
(670
.6 ~ 1
9.5ft-lbs
in.
BE
2-stro ke oil
brand
certified
r.p.m.
x 1 (8
( + 2 )
ln
. 5 _
196
mm)
-
-------------
in.
7 in.
(1
1.101±i3mm
(270± 2
ins.
6.0
(
ln.
------------
(430
c.c)
motor
oil "MS"
----------
98
in/22 lbs.
mm)
in.
(0
mm.)
GS338G
. (2.3 ~ 2.7
(0045 ~ 0.050
2-stroke
for
point
5
(0
65 ~ 1.87
+ 0 5 )
- 1.5 mm.
2 ~ 1 .0 mm.)
oil labeled
service TC-
checker
-
--------------
8400)
mm
.
20 ~ 0.25
-
-------
(Color code: Black)
(Color code:
(20 ~ 25 mm./
mm.)
mm)
detergent
mm)
W"
mm)
Not
m-kgs.)
--
painted)
----·-
-
---
1 0 kg.)
-
--------
--
---------
--------
----
--
-
-
Note:
The research and engineering
provements
maha Snowmobile
and
modific
Dealers as soon as
departments
ations are therefore inevitable.
of
Yamaha are
it
is available.
continual
Information
- 3 -
ly
str
ivi ng
to
further
regarding changes
perfect the
will
be
forwarded
GS338G
to
Snowmobil
all
Authorized
e. Im-
Ya-
GENERAL
1-
2.
Donnees
GENERALITE
d'entretien
MODELE
GS338G
MOTEUR:
Couple
de serrage de
Ia
culasse
Jeu du piston
Huile de graissage (recommandee)
Ecrous: 2,3 ~ 2,7 m-kg
0,045 ~ 0,050
1.
Huile deux-temps Yamalube
mm
2. Autre marque d'huile repondant aux prescriptions BIA
Calage de l'allumage
Rapport volumetrique
Regime de ralenti
Bougie (S.T.D.)
pour service
Avec Jauge
1,5±0,1
6,58:
1
1.800±100 t/min
N.G
.K. B-7HS
TC-
W
a cadran et controleur de vis platinee
mm
AV. P.M.H.
Carburateur
Modele
Gicleur principal (d'origine)
Gicleurs principaux en option
Vis
de ralenti
Gicleur de ralenti (d'origine)
Gicleur partie) (d'origine)
Niveau d'essence
Siege de pointeau
~------------
Pompe
---------------------+------------------------------------------------------
ahuile
Course minimum
Course maximum
~
------------------------------+-~----~--------------------------------------------
KEIHIN
#140
#145, 135 et 130
1/4
1#60
#70
+2
5_
¢1
0,20 ~ 0,
1,65
CDX42-38 x I (88400)
mm
5
,8 mm
25
mm
~
1,87 mm
-----------
·---·--
TRANSMISSION:
Poulies:
Ressort de poulie primaire
Ressort de poulie secondaire
Courroie trapezoidale
Distance entre poulies:
Decalage des poulies:
~
------------------------------~--------------------------------·---------------------------
Piece No. 90501-45162, Couleur de til: Noir
Piece No. 90508-35073, Couleur de til: Non colore
Piece No. 820 -1 7641 Longueur de circonference ext:
00
1,
108 ± 8 mm
270±2 mm
+0,5
6,0
-),
mm
5
Carter de chaine:
Contenance d'huile
Huile
Taux de reduction
(Pinion
430 cc (0,45 oz.)
Huile moteur detergeante SAE 10W/ 30W
12/23
"MS"
menant/pinion mene de chaine)
Suspension :
Fleche de Ia chenille:
20 ~ 25
mm/10 kg
Frein:
Limite d'usure des plaquettes
de frein
Jeu plaquette-disque
1,0mm
0,2 ~ 1,0 mm
CHASSIS:
Ecartement des skis (d'origine)
670mm
Remarque
:
Les departements de recherche et d'etude
modifications sont done inevitables. Tous
tions ou alterations.
de
Yamaha s'efforcent d'ameliorer sans cesse
Ies
concessionnaires Motoneiges Yamaha seront avises des que possible de toutes modifica-
- 4 -
Ie
motoneige GS338G. Par consequent, des
2.
Operatio
As
crankc
mixture
n
the piston
ase
is dra
buretor. As
seals
off all
til
it
is
above
During
negative
and
drive
vibrate
engine
pressure
carried
chamber.
up
diaphragm
through
then
The
tension
same
But it is
than
to
main
time.
the
the
the
spring
so
downward
The inlet
valve
seat.
ch
amber. the
rises. This rising
downwa
As
the
and
prevents
rising.)
pressure
This
is
is
rd
the
main
inlet control l
thus
the
In
is
chamber
located
turned
in, it
spring.
This
results
before
the
out.
the
diaphragm
fuel
pressure
The
amo
unt
tube
attached
level
height
adjustment
Once th
then
car
metered
justing
chamber
e fuel level
there
buretor
by
screw,
port
turi.
As
this
fuel
vaporized
crankcase
moves
drops below
wn
the
parts
and
atmospher
through
This
and dow
action
outlet.
regulator
diaphragm
through
it is forced
designed
upward,
atmospheric
into
the
piston
moves
compresses
ic
operation,
pulses
the
impulse
causes
n.
sucks
check
chamber.
is forced
the
upward
that the
crankcase
pressure.
alternating
are
caused
the
fuel
The
fuel
out
valve.
downward
inlet control lever.
by
upward
force.
control valve is usually
But
when
fuel flows into
fuel
weight
pressure
against
diaphragm
ever
the
fuel
pressure
this
manner. a constant
maintained
pressure
in
the
bottom
pushes
in
more
fuel valve is
to
shut
of
fuel
to
the
will rise
screw
is
are
two
venturi. The fuel
the
slow
it
is
discharged
and
the
enters
the
and carri
and
pressure
forces
the
force
of
is
forced
to
close
stops
flowing in. (That is, it
inside
the
regulator
.
is
variab
le.
of
the
carburetor.
more
firmly
pressure
shut
spring
off
pressure
outside
and
screwed
has
off.
relaxes. It
the
fuel valv e.
is
fall
with
been
through
registered
of
in
stabilized by
adjustments
(under
adjusting
screw
through
main
discharge
carburetor
ed along
by
the
.
GENERAL
the
pre
ssure
pressure.
from
and
the
downward, the
crankcase
volume un-
positive
in
the
crankcase
port
to
the
fuel
pump
diaphragm
up
and
down pump
from .the fuel tank.
and
inlet control valve,
by
the
the
diaphragm
force
separated
in
the
main
the
diaphragm
downward,
the
inlet control valve,
is
from
the
regulator
the
chamber
diaphragm
it caus
spring.
spring.
chamber
regulator
An
against
If
the
the
the
and
screw
carburetor.
level
out.
adjusting
If
this
the
diaphragm
the
carburetor
is
then
takes
in
a fuel level
tube
chamber
backed
adjustment,
to
control fuel to
constant
venturi,
air
pressure)
or
by
the
the
idle
port
into
it
is
broken
rushing into
main ad-
discharge
the
in
the
the
car
piston
and
pump
to
inl
et
At
the
greater
the
es
also
from
screw
screw
less
Fuel
as
the
the
ven-
up,
the
is
GENERA
2.
Fonctionnement
le
Lorsque
carter descend sous
-
lange est attire
piston se deplace vers
mettent
so
it au-dessus de
Durant
piston se deplace vers
Ia
pression atmospherique,
dans
le
carter du carburateur. Lorsq
le
Ia
compression du volume du carter
Ia
pression atmospherique.
le fonctionnement du moteur, des impulsions de
le
haut,
Ia
pression dans le
bas, les segments de celui-ci per-
jusqu'a
pression negatives et positives alternativement
le carter
d'
sence. Ainsi
le haut et le bas. Cette action de
piration de !'essence
termediaire du clapet de retenue et de
mande d'admission
et
impulsion a
sont acheminees
Ia
chambre de
Ia
membrane de
a partir du reservoir d'essence,
a
Ia
chambre
par
l'intermediaire de !'orifice
commande
Ia
pompe a essence vibre vers
de
Ia
Ia
membrane permet !'as-
Ia
soupape de
de regulation.
La membrane principale est forcee vers le bas
d'adm
ission
par
l'intermediaire du levier de
d'admission.
le
ressort de
Ia
force vers
Au
meme moment
Ia
membrane. Mais
le
haut est plus grande que
il
est force vers
sa
conception est telle que
Ia
force vers
La soupape de commande d'admission est generalement
paree
du siege de
coule
dans
Ia
pression
tion de pression force Ia membrane vers
force du ressort de
principale est forcee vers
d'admission ferme
par
suite !'essence
auss
i,
empeche
Ia
chambre de regulation). De cette
constante
dans
Ia
soupape. Mais lorsque !'essence s'e-
Ia
chambre de regulation,
dans
Ia
chambre
Ia
aug
.membrane. Lorsque
le
Ia
soupape de commande d
ne
penetre plus a l'interieur (c'est a dire
!'au
gmentation de
le
poids de !'essence et
mentent.
bas,
le
levier de commande
Ia
pression a l'interieur de
fa<;:on,
Ia
chambre de regulation est maintenue .
Cet
le
bas contre Ia
Ia
'ad
La pression de cette chambre est variable. U
glage e
st
situee a
Ia
partie inferieure du carburateur.
LITE
et
le me-
ue
ce qu'il
ont
lieu
dans
pompe a es-
par
l'in-
com
par
le
ressort
commande
le
haut
par
le
bas.
se-
te augmenta-
membrane
mission, et
une pression
ne
vis de re-
le
-
Si
cette vis est vissee, elle pousse plus fermement contre le res-
-
sort de Ia membrane.
II
en resulte plus de pression a l'interieur du
ava
nt que
Ia
Si
Ia
vis est devissee,
soupape
d'adm
ission de !'essence so
le
ressort de membrane se relache.
carb
it
faut done moins de pression d'essence pour fermer
urateur
fermee.
Ia
sou-
il
pape d'essence.
La
qu
antite de pression d'essence est enregistree
tube de niveau d'essence
fixe a l'exterieur du carburateur.
dans
un
Le niveau d'essence variera done avec le niveau du tube
lorsque
Lorsque le niveau de !'essence est stabilise
reglages
teur doivent
tante) est mesuree
n!gla
chambre et
tur
Lorsq ue !'essence entre
est pulverisee, vaporisee et transmise
ge
i.
Ia vis
de reglage sera vissee et devissee.
pour
commander !'essence au venturi du
etre effectues. L'essence (sous press i
par
Ia vis de reglage lent
principal,
iJ
est libere
par
!'orifice de liberation principal dans le ven-
par
!'orifice de liberation de
dan
s le venturi du carburateur, elle
par
par
reglage, deux
carbura
on
cons-
ou
par
Ia
vis de
Ia
I' air dans le carter.
-
- 11 -
GENERAL
1 -3-
2.
Power
Engine
power
ing
manner:
0
The
crankshaft.
through
0
The
secondary
are
mounted
secondary
down
on
the
0
As
the
sprocket.
track.
1.
Primary
As
the
side
the
trifugal force.
causes
the
primary
As a resu
sheave
ing
transmitted
drive
~
2.700
As
engine
further
belt
radially.
constant.
is
pulled
toward
sheave
change;
changed
To
sum
and
the
2. S
econdary
This
manner:
a.
When
secon
by
the
As
engine
b.
ed
together.
center
The V-belt
other
belt
on
diameter
transmission
is
transmitted
primary
through a chain
system.
secondary
at
dary
of
words.
sheave
It
transm
the
V-belt.
sheave
on
sheave.
front
axle.
front axle
The
sprocket
sheave
engine
the
toward
secondary
speed
primary
overcoming
primary sliding
fixed
lt.
the V-belt
and
the
fixed
to
The
r.p.m.
speed
the
Since
the
V-belt
by
the
the
shaft.
diameter
that
is.
according
up,
the
secondary
sheave
rest
or
sliding
rpm
increases.
the
the
secondary
wedges
the
the
primary
on
the
the
sheave
sheave.
the
increases.
fixed s
primary
This
the
reduction
sheave
at
slow
sheave
spr
V-belt is
diameter
secondary shea
to
mounts
its
power
unit
same
through
to
turns.
increases.
cap
is
sheave.
drive
V-belt
heave
the length
on
the
causes
to
secondary
reduction
to
the
sheave
speed
ing.
sheaves.
the
tw o
sheave
the
drive
track
directly
to
the
and
chaincase
shaft.
Power passes
the
drive
the
driven
it
rotates a single
meshes
the
gripped
begins
sheave
load
ratio
varies
operates
is
and
of
with.
the
weights
are
thrown
primary
sheave
side
secondary
to
between
Engine
track
through
turning
the
sliding
and
squeezes
of
the
of
the
and
the
ratio
sheave
ratio is
and
speed
between
from 3. 5 : 1
(and
high
forced
against
primary
pulled
down
the
circle
becomes larger.
ve
becomes
in
the
to
the
secondary
drive
sprocket.
sprocket
and
turn
loc
outward
spr
ing force. This
be
pushed
the
power
is
the
complete
at
about
sheave
out
V -
belt
secondary
forced
of
the
diameter
automatically
of
the
the
crankshaft
to 1 1.
in
the
following
track
load),
fixed
sheaves
closer
sheaves
formed
apart.
by
while
smaller
follow-
engine
sheave
sprocket
from
the
then
mounted
attached
s.
the
ated in-
by
cen-
toward
sliding
now
be-
2,600
moves
the
V-
rem
ains
sheave
to
move
primary
to
engine.
the
sheave
are
forc-
to
the
In
the
V-
the
.
GENERALITE
Ia
1-3-2. Transmission de
La
puissance du
Ia
fac;:on
de
0 La puolie primaire est couplee directement au vilebrequin.
Elle transmet Ia puissance
termediaire d'une courroie en
0 L'unite
chaine sont montes sur
Ia
transmise de Ia poulie secondaire
non de
chaine
avant.
0 Lorsque !'axe avant tourne,
chaine. Le pignon s'engrene et permet le mouvement des
de
chenilles.
Poulie primaire
I.
Lorsque
poids situes
sont projetes vers l'exterieur
lisant
bile primaire est poussee vers Ia poulie fixe primaire.
tre part,
Ia
poulie fixe. La puissance
transmise aux chenilles
commande
moteur
suivante:
de
poulie secondaire et le pignon
commande
au
pignon
Ia
vitcsse
a l'interieur du couvercle de
Ia
force du ressort primai re.
Ia
courroie en V est serree entre Ia poulie mobile et
complet.
a environ 2.600
ue
Lorsq
ie
l
en
cons
par
Par
le
le
fonction de
Pour resumer,
Ia
2.
Poulie secondaire
Cette
Au
a.
condaire mobile est appliquee contre
ressort secondaire.
b. Lorsque
poulies primaires
est
La courroie en V maintient les deux poulies secondaires
parees. En
Ia courroie en V
tandis que
petit.
Ia vitesse
mobile se deplace vers Ia poulie fixe
V,
de
fac;:on
tante, celle-ci du cote
Ia
poulie primaire
suite
le
rapport
diametre
rapport
pou
tiree vers
de
Ia
de
reduction est automatiquement modifie en
Ia
charge
le
lie
secondaire varie de 3,5 : I a I : I.
poulie fonctionne de
repos
ou
a faible vitesse (et forte charge),
Ia
rotation (tpm)
le
bas
d'autres
Ie
diametre
puissance
est transmise a
a
le
de
chaine, puis
de
chaine
il
de
rotation
par
La
courroie en V commence a tourner
~
2.700 tpm.
de
rotation
radiale. La longueur de
de
et
obligee
entre le diametre de Ia poulie primaire et
poulie secondaire change; c'est a dire
et
de Ia vitesse
rapport
de reduction entre
Ia
du
sont
pressees ensembles, Ia courroie en V
vers
le
centre des poulies secondaires.
termes,
le
sur
Ia poulie primaire devient plus
sur
Ia
Ia
piste d'entrainement
Ia
poulie secondaire
V.
de
commande
meme
arbre
. La puissance est
par
l'intermediaire du pig-
par
l'intermediaire de Ia
commande
assure Ia rotation
du
par
Ia force centrifuge, neutra-
du
l'intermediaire du systeme de
du
moteur
Ia
poulie secondaire est tiree
de
fac;:on
moteur
diametre
pou
lie secondaire devient plus
monte sur !'axe
d'un
moteur
Par
moteur
se deplacer vers !'axe.
augmente, les
Ia
poulie primaire
suite Ia poulie mo-
est maintenant
augmente,
et
serre Ia courroie
Ia
courroie
du
moteur.
le
vilebrequin et
suivante:
Ia poulie se-
Ia
poulie fixe
augmente, et que les
du
cercle forme
par
pignon
D'au
Ia
etant
par
grand,
l'in-
de
-
pou-
que
le
se-
par
-12-
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