2006 YAMAHA TTR90 transmission oil

CHAPTER 4
ENGINE
CARBURETOR ..........................................4-1
CYLINDER HEAD ......................................4-8
CAMSHAFT AND ROCKER ARMS ........4-13
VALVES AND VALVE SPRINGS ............4-16
CYLINDER AND PISTON ........................4-21
CLUTCH ...................................................4-27
KICK AXLE ..............................................4-33
SHIFT SHAFT ..........................................4-34
OIL PUMP ................................................4-36
CDI MAGNETO (TT-R90) ........................4-39
CDI MAGNETO AND
STARTER CLUTCH (TT-R90E) ...............4-41
CRANKCASE AND CRANKSHAFT ........4-45
SHIFT FORK, SHIFT CAM AND
TRANSMISSION ......................................4-48
CHAPTER 5
CHASSIS
FRONT WHEEL AND REAR WHEEL .......5-1
FRONT FORK ..........................................5-10
HANDLEBAR ...........................................5-13
STEERING ...............................................5-18
SWINGARM .............................................5-20
CHAPTER 6
ELECTRICAL
ELECTRICAL COMPONENTS AND
WIRING DIAGRAM ....................................6-1
IGNITION SYSTEM ....................................6-3
ELECTRIC STARTING SYSTEM
(TT-R90E) ..................................................6-7
CHARGING SYSTEM (TT-R90E) ............6-15
CARBURETOR HEATING SYSTEM .......6-17
MAINTENANCE RECORD ......................6-21

GEN
INFO
1 - 13
STARTING AND OPERATION
STARTING AND OPERATION
CAUTION:
Prior to operating the machine, perform
steps listed in pre-operation check list.
WARNING
Never start your engine or let it run for any
length of time in a closed area. The exhaust
fumes are poisonous and can cause loss of
consciousness and death within a short
time. Always operate your machine in an
area with adequate ventilation.
STARTING A COLD ENGINE
TT-R90
WARNING
Before starting the engine, be sure to shift
the transmission into neutral.
1. Turn the fuel cock to “ON”.
2. Operate the starter (choke) and completely
close the throttle grip.
3. Slide the “ENGINE STOP” switch to the
“”.
4. Kick the kick starter with full strength to
start the engine.
5. After the engine starts, warm up for one or
two minutes. Make sure the stater (choke)
is returned to the original position before
riding.
TT-R90E
WARNING
Before starting the engine, be sure to shift
the transmission into neutral.
NOTE:
This model is equipped with an ignition cir-
cuit cut-off system. In case of electric start-
ing, the engine can be started only when the
transmission is in neutral.
If the engine fails to start by pushing the start
switch, release the switch, wait a few sec-
onds, and then try again. Each starting
attempt should be as short as possible to
preserve the battery. Do not crank the
engine more than 10 seconds on any one
attempt. If the engine does not start with the
starter motor, try using the kickstarter.1. Turn the fuel cock to “ON”.
2. Turn the main switch to “ON”.
3. Shift the transmission into neutral.
4. Operate the starter (choke) and completely
close the throttle grip.
5. Slide the “ENGINE STOP” switch to the
“”.
6. Start the engine by pushing the start switch
or by kicking the kickstarter.
7. After the engine starts, warm up for one or
two minutes. Make sure the stater (choke) is
returned to the original position before riding.
STARTING A WARM ENGINE
To start a warm engine, refer to the “Starting a
cold engine” section. The starter (choke)
should not be used. The throttle should be
opened slightly.
CAUTION:
See “Engine break-in Section” prior to
operating engine for the first time.
WARMING UP
To get maximum engine life, always “warm-up”
the engine before starting off. Never accelerate
hard with a cold engine! To see whether or not
the engine is warm, see if it responds to throttle
normally with the stater (choke) turned off.
WARNING
Before starting off, be sure to turn up or
remove the side stand.
Failure to retract the side stand completely
can result in a serious accident when you
try to turn a corner.
ENGINE BREAK-IN
Brake-in is important to better fit the moving
and sliding parts as well as the installed parts.
It is also important to accustom the rider to the
machine better.
Avoid full-throttle run on a new machine for the
first 5 hours.
After the trial run, check for loose parts, oil
leakage and other problems.
Make full inspection and adjustment especially of
slack cables and drive chain and loose spokes.
CAUTION:
After the break-in period, check every fit-
ting and fastener for looseness.
If any loose is found, retighten it securely.

GEN
INFO
1 - 14
CLEANING AND STORAGE
EC1B0000
CLEANING AND STORAGE
EC1B1000
CLEANING
Frequent cleaning of your machine will
enhance its appearance, maintain good overall
performance, and extend the life of many com-
ponents.
1. Before washing the machine, block off the
end of the exhaust pipe to prevent water
from entering.
2. If the engine is excessively greasy, apply
some degreaser to it with a paint brush. Do
not apply degreaser to the chain, sprock-
ets, or wheel axles.
3. Rinse the dirt and degreaser off with a gar-
den hose; use only enough pressure to do
the job.
CAUTION:
Excessive hose pressure may cause water
seepage and contamination of wheel bear-
ings, front forks, brakes and transmission
seals. Many expensive repair bills have
resulted from improper high pressure
detergent applications such as those avail-
able in coin-operated car washers.
4. After the majority of the dirt has been
hosed off, wash all surfaces with warm
water and a mild detergent. Use an old
toothbrush to clean hard-to-reach places.
5. Rinse the machine off immediately with
clean water, and dry all surfaces with a soft
towel or cloth.
6. Immediately after washing, remove excess
water from the chain with a paper towel
and lubricate the chain to prevent rust.
7. Clean the seat with a vinyl upholstery
cleaner to keep the cover pliable and
glossy.
8. Automotive wax may be applied to all
painted or chromed surfaces. Avoid combi-
nation cleaner-waxes, as they may contain
abrasives.
9. After completing the above, start the
engine and allow it to idle for several min-
utes.
EC182001
STORAGE
If your machine is to be stored for 60 days or
more, some preventive measures must be
taken to avoid deterioration. After cleaning the
machine thoroughly, prepare it for storage as
follows:
1. Drain the fuel tank, fuel lines, and the car-
buretor float bowl.
2. Remove the spark plug, pour a tablespoon
of SAE 10W-30 motor oil in the spark plug
hole, and reinstall the plug. With the engine
stop switch pushed in, kick the engine over
several times to coat the cylinder walls with
oil.
3. Remove the drive chain, clean it thoroughly
with solvent, and lubricate it. Reinstall the
chain or store it in a plastic bag tied to the
frame.
4. Lubricate all control cables.
5. Block the frame up to raise the wheels off
the ground.
6. Tie a plastic bag over the exhaust pipe out-
let to prevent moisture from entering.
7. If the machine is to be stored in a humid or
salt-air environment, coat all exposed
metal surfaces with a film of light oil. Do not
apply oil to rubber parts or the seat cover.
NOTE:
Make any necessary repairs before the
machine is stored.

SPEC
2 - 3 Transmission:
Primary reduction system Spur gear
Primary reduction ratio 67/18 (3.722)
Secondary reduction system Chain drive
Secondary reduction ratio 35/14 (2.500)
Transmission type Constant mesh, 3-speed
Operation Left foot operation
Gear ratio: 1st 37/13 (2.846)
2nd 33/19 (1.736)
3rd 28/23 (1.217)
Chassis:
Frame type Steel tube backbone
Caster angle 24.83°
Trail 56.0 mm (2.2 in)
Tire:
Type With tube
Size (front) 2.50-14 4PR
Size (rear) 3.00-12 4PR
Manufacturer (front and rear) CHENG SHIN
Type (front and rear) KNOBBY
Tire pressure (front and rear) 100 kPa (1.00 kgf/cm
2, 14.5 psi)
Brake:
Front brake type Drum brake
Operation Right hand operation
Rear brake type Drum brake
Operation Right foot operation
Suspension:
Front suspension Telescopic fork
Rear suspension Swingarm (monocross suspension)
Shock absorber:
Front shock absorber Coil spring/oil damper
Rear shock absorber Coil spring/gas, oil damper
Wheel travel:
Front wheel travel 110 mm (4.33 in)
Rear wheel travel 95 mm (3.74 in)
Electrical:
Ignition system CDI
Generator system (TT-R90E) CDI magneto
Battery type (TT-R90E) GT4B-5
Battery voltage/capacity (TT-R90E) 12 V/2.5 AH
Specific gravity (TT-R90E) 1.350
GENERAL SPECIFICATIONS

2 - 4
SPECCARACTERISTIQUES D’ENTRETIEN
CARACTERISTIQUES D’ENTRETIEN
MOTEUR
Elément Standard Limite
Culasse:
Limite de déformation ---- 0,03 mm
(0,0012 in)
Cylindre:
Alésage 47,000 à 47,005 mm
(1,8504 à 1,8506 in)47,05 mm
(1,8524 in)
Limite d’ovalisation ---- 0,05 mm
(0,0020 in)
Arbre à cames:
Méthode de transmission Transmission par chaîne (gauche) ----
Dimensions de came
Admission“A”25,428 à 25,528 mm
(1,0011 à 1,0050 in)25,400 mm
(1,0000 in)
“B”21,034 à 21,134 mm
(0,8281 à 0,8320 in)21,000 mm
(0,8268 in)
Echappement“A”25,286 à 25,386 mm
(0,9955 à 0,9994 in)25,260 mm
(0,9945 in)
“B”21,047 à 21,147 mm
(0,8286 à 0,8326 in)21,017 mm
(0,8274 in)
Limite de voile d’arbre à cames ---- 0,03 mm
(0,0012 in)

2 - 11
SPECCARACTERISTIQUES D’ENTRETIEN
CHASSIS
Elément Standard Limite
Système de direction:
Type de roulement de direction Roulement oblique ----
Suspension avant:
Débattement de fourche 110 mm (4,33 in) ----
Longueur libre de ressort de fourche 425,1 mm (16,74 in) 417 mm (16,4 in)
Longueur de ressort de fourche installé415,1 mm (16,34 in) ----
Raideur de ressort, standard K = 3,4 N/mm
(0,35 kg/mm, 19,41 lb/in)----
Ressort/entretoise en option Non ----
Capacité d’huile 64 cm
3 (2,26 Imp oz, 2,16 US oz) ----
Niveau d’huile 185 mm (7,28 in) ----
Qualité d’huile Huile de fourche 15W ou équivalente ----
Suspension arrière:
Débattement d’amortisseur 48 mm (1,89 in) ----
Longueur de ressort libre 169 mm (6,65 in) ----
Longueur monté165 mm (6,5 in) ----
Raideur de ressort, standard K = 45,6 N/mm
(4,65 kg/mm, 260 lb/in)----
Ressort en option Non ----
Pression du gaz enfermé2.000 kPa
(20 kg/cm
2, 290 psi)----
Bras oscillant:
Limite de jeu du bras oscillant
A l’extrémité---- 1,0 mm (0,04 in)
Jeu latéral ---- 0,3 mm (0,01 in)
Roue:
Type de roue avant Roue à rayons ----
Type de roue arrière Roue à rayons ----
Taille/matériau de la jante avant 14 × 1,40/acier ----
Taille/matériau de la jante arrière 12 × 1,60/acier ----
Limite de voile de la jante:
Radial ---- 2,0 mm (0,08 in)
Latéral ---- 2,0 mm (0,08 in)
Chaîne de transmission:
Type/fabricant DID420(I)/DAIDO ----
Nombre de maillons 86 maillons ----
Flèche de la chaîne 40 à 53 mm (1,6 à 2,1 in) ----
Longueur de la chaîne (15 maillons) ---- 194,3 mm
(7,65 in)

INSP
ADJ
CONTROLES ET ENTRETIENS AVANT UTILISATION
CONTROLES ET ENTRETIENS AVANT UTILISATION
Avant d’entamer le rodage de la moto ou un entraînement, s’assurer que la moto est en bon état de marche.
Contrôler les points suivants avant d’utiliser cette moto.
CONTROLES ET ENTRETIENS GENERAUX
Elément Travail Page
Freins Contrôler le fonctionnement et le réglage. P3-12
Huile moteur Changer l’huile comme spécifié. P3-6 à 8
Chaîne de transmission Contrôler l’alignement, le réglage et la lubrification. P3-13 à 15
Bougie Contrôler la couleur et l’état. P3-23
Accélérateur Contrôler le bon fonctionnement du câble des gaz. P3-4
Filtre à air En mousse – doit toujours être propre et légèrement imbibé d’huile. P3-4 à 5
Roues et pneusContrôler la pression de gonflage, le voile, le serrage des rayons, la butée de
talon et les écrous d’axe.P3-17 à 20
Visserie Contrôler tout – resserrer si nécessaire. P2-13
3 - 3