wheel YAMAHA TTR50 2007 User Guide

PERIODIC MAINTENANCE AND MINOR REPAIR
6-25
6
EAU24350
Supporting the motorcycle Since this model is not equipped with a
centerstand, follow these precautions
when removing the front and rear
wheel or performing other maintenance
requiring the motorcycle to stand up-
right. Check that the motorcycle is in a
stable and level position before starting
any maintenance. A strong wooden
box can be placed under the engine for
added stability.
To service the front wheel
1. Stabilize the rear of the motorcycle
by using a motorcycle stand or, if
an additional motorcycle stand is
not available, by placing a jack un-
der the frame in front of the rear
wheel.
2. Raise the front wheel off the
ground by using a motorcycle
stand.
To service the rear wheel
Raise the rear wheel off the ground by
using a motorcycle stand or, if a motor-
cycle stand is not available, by placinga jack either under each side of the
frame in front of the rear wheel or under
each side of the swingarm.
EAU24360
Front wheel
EAU39791
To remove the front wheel
WARNING
EWA10820


It is advisable to have a Yamaha
dealer service the wheel.


Securely support the motor-
cycle so that there is no dangerof it falling over.
1. Remove the guard from each front
fork leg by removing the bolts.
2. Disconnect the brake cable at the
wheel by removing the brake lever
free play adjusting nut at the brake
1. Front fork leg guard
2. Bolt
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-26
6 camshaft lever, then remove the
cable from the brake camshaft le-
ver.
3. Loosen the axle nut.4. Lift the front wheel off the ground
according to the procedure on
page 6-25.
5. Remove the axle nut and washer.
6. Pull the wheel axle out, and then
remove the wheel.
EAU39801
To install the front wheel
1. Lift the wheel up between the fork
legs.
2. Insert the wheel axle from the
right-hand side.NOTE:Make sure that the slot in the brake
shoe plate fits over the retainer on thefork leg.3. Lower the front wheel so that it is
on the ground.
4. Install the washer and axle nut,
and then tighten the axle nut to the
specified torque.
5. Connect the brake cable to the
brake camshaft lever, and then in-
stall the brake cable free play ad-
justing nut on the brake cable.
6. Adjust the brake lever free play.
(See page 6-14.)
1. Brake cable
2. Brake camshaft lever
3. Brake lever free play adjusting nut
1. Axle nut
2. Washer
1. Wheel axle
1. Slot
2. Retainer
Tightening torque:
Axle nut:
35 Nm (3.5 m·kgf, 25 ft·lbf)
1
2
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-27
67. While applying the front brake,
push down hard on the handlebar
several times to check for proper
fork operation.
8. Install each front fork leg guard by
installing the bolts.
EAU25080
Rear wheel
EAU39770
To remove the rear wheel
WARNING
EWA10820


It is advisable to have a Yamaha
dealer service the wheel.


Securely support the motor-
cycle so that there is no dangerof it falling over.
1. Loosen the axle nut.2. Remove the brake pedal free play
adjusting nut, and then disconnect
the brake rod from the brake cam-
shaft lever.
3. Loosen the locknut and drive chain
adjusting nut on each end of the
swingarm.
4. Lift the rear wheel off the ground
according to the procedure on
page 6-25.
5. Remove the axle nut and washer,
then pull the wheel axle out.
1. Axle nut
2. Washer
3. Drive chain slack adjusting nut
4. Locknut
1
4
3
2
1. Brake pedal free play adjusting nut
2. Brake rod
3. Brake camshaft lever
1
2
3
U1P681E0.book Page 27 Tuesday, April 18, 2006 2:38 PM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-28
6 6. Push the wheel forward, and then
remove the drive chain from the
rear sprocket.
NOTE:The drive chain does not need to be
disassembled in order to remove andinstall the wheel.7. Remove the wheel.
EAU39781
To install the rear wheel
1. Install the drive chain onto the rear
sprocket, and then install the
wheel by inserting the wheel axle
from the right-hand side.NOTE:Make sure that the slot in the brake
shoe plate fits over the retainer on theswingarm.
2. Connect the brake rod to the brake
camshaft lever, and then install the
brake pedal free play adjusting nut
onto the brake rod.3. Adjust the drive chain slack. (See
page 6-16.)
4. Install the washer and axle nut,
and then lower the rear wheel so
that it is on the ground.
5. Tighten the axle nut to the speci-
fied torque.
6. Adjust the brake pedal free play.
(See page 6-15.)
1. Wheel axle
1. Slot
2. Retainer
Tightening torque:
Axle nut:
60 Nm (6.0 m·kgf, 43 ft·lbf)
U1P681E0.book Page 28 Tuesday, April 18, 2006 2:38 PM

MOTORCYCLE CARE AND STORAGE
7-1
7
EAU40461
Care While the open design of a motorcycle
reveals the attractiveness of the tech-
nology, it also makes it more vulnera-
ble. Rust and corrosion can develop
even if high-quality components are
used. A rusty exhaust pipe may go un-
noticed on a car, however, it detracts
from the overall appearance of a motor-
cycle. Frequent and proper care does
not only comply with the terms of the
warranty, but it will also keep your
motorcycle looking good, extend its life
and optimize its performance.
Before cleaning
1. Cover the muffler outlet with a
plastic bag after the engine has
cooled down.
2. Make sure that all caps and covers
as well as all electrical couplers
and connectors, including the
spark plug cap, are tightly in-
stalled.
3. Remove extremely stubborn dirt,
like oil burnt onto the crankcase,
with a degreasing agent and a
brush, but never apply such prod-ucts onto seals, gaskets, sprock-
ets, the drive chain and wheel
axles. Always rinse the dirt and de-
greaser off with water.
Cleaning
CAUTION:
ECA10770


Avoid using strong acidic wheel
cleaners, especially on spoked
wheels. If such products are
used on hard-to-remove dirt, do
not leave the cleaner on the af-
fected area any longer than in-
structed. Also, thoroughly rinse
the area off with water, immedi-
ately dry it, and then apply a cor-
rosion protection spray.


Improper cleaning can damage
windshields, cowlings, panels
and other plastic parts. Use only
a soft, clean cloth or sponge
with mild detergent and water to
clean plastic.


Do not use any harsh chemical
products on plastic parts. Be
sure to avoid using cloths or
sponges which have been in
contact with strong or abrasivecleaning products, solvent or
thinner, fuel (gasoline), rust re-
movers or inhibitors, brake flu-
id, antifreeze or electrolyte.


Do not use high-pressure wash-
ers or steam-jet cleaners since
they cause water seepage and
deterioration in the following ar-
eas: seals (of wheel and swing-
arm bearings, fork and brakes),
electric components (couplers,
connectors, instruments,
switches and lights), breather
hoses and vents.


For motorcycles equipped with
a windshield: Do not use strong
cleaners or hard sponges as
they will cause dulling or
scratching. Some cleaning com-
pounds for plastic may leave
scratches on the windshield.
Test the product on a small hid-
den part of the windshield to
make sure that it does not leave
any marks. If the windshield is
scratched, use a quality plastic
polishing compound afterwashing.
U1P681E0.book Page 1 Tuesday, April 18, 2006 2:38 PM

MOTORCYCLE CARE AND STORAGE
7-3
7
EAU26150
Storage Short-term
Always store your motorcycle in a cool,
dry place and, if necessary, protect it
against dust with a porous cover.CAUTION:
ECA10810


Storing the motorcycle in a
poorly ventilated room or cover-
ing it with a tarp, while it is still
wet, will allow water and humid-
ity to seep in and cause rust.


To prevent corrosion, avoid
damp cellars, stables (because
of the presence of ammonia)
and areas where strong chemi-cals are stored.
Long-term
Before storing your motorcycle for sev-
eral months:
1. Follow all the instructions in the
“Care” section of this chapter.
2. For motorcycles equipped with a
fuel cock that has an “OFF” posi-
tion: Turn the fuel cock lever to
“OFF”.3. Drain the carburetor float chamber
by loosening the drain bolt; this will
prevent fuel deposits from building
up. Pour the drained fuel into the
fuel tank.
4. Fill up the fuel tank and add fuel
stabilizer (if available) to prevent
the fuel tank from rusting and the
fuel from deteriorating.
5. Perform the following steps to pro-
tect the cylinder, piston rings, etc.
from corrosion.
a. Remove the spark plug cap
and spark plug.
b. Pour a teaspoonful of engine oil
into the spark plug bore.
c. Install the spark plug cap onto
the spark plug, and then place
the spark plug on the cylinder
head so that the electrodes are
grounded. (This will limit spark-
ing during the next step.)
d. Turn the engine over several
times with the starter. (This will
coat the cylinder wall with oil.)
e. Remove the spark plug cap
from the spark plug, and then
install the spark plug and the
spark plug cap.
WARNING
EWA10950
To prevent damage or injury from
sparking, make sure to ground the
spark plug electrodes while turningthe engine over.
6. Lubricate all control cables and the
pivoting points of all levers and
pedals as well as of the side-
stand/centerstand.
7. Check and, if necessary, correct
the tire air pressure, and then lift
the motorcycle so that both of its
wheels are off the ground. Alterna-
tively, turn the wheels a little every
month in order to prevent the tires
from becoming degraded in one
spot.
8. Cover the muffler outlet with a
plastic bag to prevent moisture
from entering it.
9. Remove the battery and fully
charge it. Store it in a cool, dry
place and charge it once a month.
Do not store the battery in an ex-
cessively cold or warm place [less
than 0 °C (30 °F) or more than 30
U1P681E0.book Page 3 Tuesday, April 18, 2006 2:38 PM

SPECIFICATIONS
8-1
8
Dimensions:Overall length:
1305 mm (51.4 in)
Overall width:
595 mm (23.4 in)
Overall height:
775 mm (30.5 in)
Seat height:
555 mm (21.9 in)
Wheelbase:
925 mm (36.4 in)
Ground clearance:
135 mm (5.31 in)
Minimum turning radius:
1400 mm (55.1 in)Weight:With oil and fuel:
57.0 kg (126 lb)Engine:Engine type:
Air cooled 4-stroke, SOHC
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
49.0 cm³ (2.99 cu.in)
Bore × stroke:
36.0 × 48.6 mm (1.42 × 1.91 in)
Compression ratio:
9.50 :1
Starting system:
Electric starter
Lubrication system:
Wet sump
Engine oil:Type:
SAE10W30 or SAE10W40 or SAE15W40
or SAE20W40 or SAE20W50
(AUS)(AUT)(BEL)(CHE)(DEU)(DNK)(ESP
)(FIN)(FRA)(GBR)(GRC)(IRL)(NLD)(NOR)
(NZL)(PRT)(SWE)(ZAF)
YAMALUBE 4, SAE10W30 or SAE20W40
(CAN)
Recommended engine oil grade:
API service SE, SF, SG type or higherEngine oil quantity:
Periodic oil change:
0.80 L (0.85 US qt) (0.70 Imp.qt)
Air filter:Air filter element:
Wet elementFuel:Recommended fuel:
Regular unleaded gasoline only
(AUT)(BEL)(CAN)(CHE)(DEU)(DNK)(ESP
)(FIN)(FRA)(GBR)(GRC)(IRL)(NLD)(NOR)
(PRT)(SWE)(ZAF)
Unleaded gasoline only (AUS)(NZL)
Fuel tank capacity:
3.1 L (0.82 US gal) (0.68 Imp.gal)
Fuel reserve amount:
0.4 L (0.11 US gal) (0.09 Imp.gal)Carburetor:Manufacturer:
MIKUNI
Type × quantity:
VM11 x 1Spark plug (s):Manufacturer/model:
NGK/CR7HSA
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)Clutch:Clutch type:
Wet, multiple-disc and centrifugal
automaticTransmission:Primary reduction system:
Spur gear
-20 -10 0
10 20 30
40
50 ˚C
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40
10° 30° 50° 70° 90°
110°
0°
130°F
YAMALUBE 4 (10W30)
or SAE 10W30
YAMALUBE 4 (20W40)
or SAE 20W40
–10° 0° 10° 20° 30°
40° –20°
50°C
U1P681E0.book Page 1 Tuesday, April 18, 2006 2:38 PM

SPECIFICATIONS
8-2
8
Primary reduction ratio:
67/18 (3.722)
Secondary reduction system:
Chain drive
Secondary reduction ratio:
37/13 (2.846)
Transmission type:
Constant mesh 3-speed
Operation:
Left foot operation
Gear ratio:
1st:
39/12 (3.250)
2nd:
33/19 (1.736)
3rd:
28/23 (1.217)Chassis:Frame type:
Steel tube backbone
Caster angle:
25.50 °
Trail:
34.0 mm (1.34 in)Front tire:Type:
With tube
Size:
2.50-10 4PR
Manufacturer/model:
CHENG SHIN/KNOBBYRear tire:Type:
With tubeSize:
2.50-10 4PR
Manufacturer/model:
CHENG SHIN/KNOBBY
Tire air pressure (measured on cold
tires):
Front:
100 kPa (15 psi) (1.00 kgf/cm²)
Rear:
100 kPa (15 psi) (1.00 kgf/cm²)
Front wheel:Wheel type:
Spoke wheel
Rim size:
10x1.40Rear wheel:Wheel type:
Spoke wheel
Rim size:
10x1.40Front brake:Type:
Drum brake
Operation:
Right hand operationRear brake:Type:
Drum brake
Operation:
Right foot operationFront suspension:Type:
Telescopic forkSpring/shock absorber type:
Coil spring
Wheel travel:
96.0 mm (3.78 in)
Rear suspension:Type:
Swingarm (monocross)
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
71.0 mm (2.80 in)Electrical system:Ignition system:
CDI
Charging system:
AC magnetoBattery:Model:
YT4B-BS/GT4B-5
Voltage, capacity:
12 V, 2.3 Ah/12 V, 2.5 AhFuse:Fuse:
10.0 A
U1P681E0.book Page 2 Tuesday, April 18, 2006 2:38 PM

INDEXAAccessories and replacement parts ...... 6-14
Air filter element, cleaning....................... 6-8BBattery................................................... 6-22
Brake and shift pedals,
checking and lubricating ..................... 6-19
Brake lever .............................................. 3-3
Brake lever, checking and lubricating ... 6-20
Brake lever free play, adjusting............. 6-14
Brake pedal ............................................. 3-3
Brake pedal free play, adjusting............ 6-15
Brake shoes, checking .......................... 6-16CCables, checking and lubricating .......... 6-19
Carburetor, adjusting ............................ 6-10
Care ........................................................ 7-1DDrive chain, cleaning and lubricating .... 6-18
Drive chain slack ................................... 6-16EEngine break-in ....................................... 5-3
Engine idling speed............................... 6-11
Engine oil ................................................ 6-6
Engine, starting a warm .......................... 5-2
Engine stop switch .................................. 3-1FFront fork, checking .............................. 6-21
Fuel ......................................................... 3-4
Fuel cock................................................. 3-5
Fuel tank breather hose .......................... 3-5
Fuel tank cap .......................................... 3-3
Fuse, replacing ..................................... 6-24
HHandlebar switches ................................ 3-1IIdentification numbers ............................ 9-1KKey identification number ....................... 9-1LLabels, location of................................... 1-4MMain switch ............................................. 3-1
Maintenance and lubrication, periodic .... 6-3
Maintenance, emission control system... 6-2
Maintenance, periodic ............................ 6-1
Model label ............................................. 9-2PParking ................................................... 5-4
Part locations .......................................... 2-1
Pre-operation check list .......................... 4-2SSafety information................................... 1-1
Seat ........................................................ 3-7
Shifting.................................................... 5-2
Shift pedal............................................... 3-2
Sidestand................................................ 3-7
Sidestand, checking and lubricating ..... 6-20
Spark arrester, cleaning ......................... 6-9
Spark plug, checking .............................. 6-5
Specifications ......................................... 8-1
Speed limiter........................................... 3-2
Starter (choke) lever ............................... 3-6
Starting and warming up a cold
engine .................................................. 5-1
Starting circuit cut-off system ................. 3-8
Start switch ............................................. 3-1Steering, checking................................. 6-21
Storage.................................................... 7-3
Supporting the motorcycle .................... 6-25
Swingarm pivots, lubricating ................. 6-20
TThrottle cable free play, adjusting ......... 6-11
Throttle grip and cable,
checking and lubricating ..................... 6-19
Tires ...................................................... 6-12
Troubleshooting .................................... 6-29
Troubleshooting chart ........................... 6-30VValve clearance..................................... 6-12
Vehicle identification number .................. 9-1WWheel bearings, checking ..................... 6-22
Wheel (front) ......................................... 6-25
Wheel (rear) .......................................... 6-27
Wheels .................................................. 6-14
U1P681E0.book Page 1 Tuesday, April 18, 2006 2:38 PM