2007 YAMAHA PW50 wheel

PERIODIC MAINTENANCE AND MINOR REPAIR
6-19
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67
8
9

EAU24360
Front wheel
EAU41021
To remove the front wheel
WARNING

EWA10820

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

Securely support the motorcy-
cle so that there is no danger of
it falling over.
1. Place the motorcycle on the cen-
terstand.
2. Disconnect the brake cable at the
wheel by removing the brake lever
free play adjusting nut, then re-
moving the cable from the brake
camshaft lever and brake shoe
plate.3. Remove the axle nut and washer.
4. Pull the wheel axle out, and then
remove the wheel.
EAU41031
To install the front wheel
1. Install the brake shoe plate into the
wheel hub as shown.
2. Lift the wheel up between the fork
legs.
NOTE:

Make sure that the slot in the brake
shoe plate fits over the retainer on the
fork leg.
1. Brake lever free play adjusting nut
2. Brake camshaft lever
3. Washer
4. Axle nut
5. Brake cable
1. Wheel axle
5
1 23
4
1

PERIODIC MAINTENANCE AND MINOR REPAIR
6-20
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3. Insert the wheel axle from the right
side.
4. Install the washer and axle nut,
and then tighten the axle nut to the
specified torque.
5. Connect the brake cable at the
wheel hub, and then install the
brake cable free play adjusting nut.
6. Adjust the brake lever free play.
(See page 6-14.)
7. Take the motorcycle off the center-
stand so that the front wheel is on
the ground.8. Push down hard on the handlebar
several times to check for proper
fork operation.

EAU25080
Rear wheel
EAU41081
To remove the rear wheel
WARNING

EWA10820

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

Securely support the motorcy-
cle so that there is no danger of
it falling over.
1. Place the motorcycle on the cen-
terstand.
2. Remove the seat. (See page 3-7.)
WARNING

EWA14580
Always let the exhaust system cool
prior to touching exhaust compo-
nents.
3. Remove the muffler bolt and
washers.
1. Retainer
Tightening torque:
Axle nut:
40 Nm (4.0 m·kgf, 28.9 ft·lbf)
1

PERIODIC MAINTENANCE AND MINOR REPAIR
6-22
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10. Pull the wheel to the right to sepa-
rate it from the final gear case, and
then remove the wheel.

EAU41521
To install the rear wheel
1. Apply a light coating of lithi-
um-soap-based grease to the
splines of the final gear case and
wheel hub.
2. Install the wheel by inserting it into
the wheel hub.
3. Install the rear arm by installing the
washers and nuts.
4. Install the axle nut.
5. Install the right-side rear shock ab-sorber by installing the mounting
bolt.
6. While applying the rear brake,
tighten the axle nut to the specified
torque.
7. Tighten the rear arm nuts and rear
shock absorber mounting bolt to
the specified torques.
8. Install the exhaust chamber and
then install the exhaust manifold
bolts.
9. Install the washers and exhaust
chamber bolt.
10. Tighten the exhaust manifold bolts
and exhaust chamber bolt to the
specified torques.11. Install the muffler by sliding the
spring clamp up to its original posi-
tion, and then installing the wash-
ers and muffler bolt.
NOTE:

Make sure that the spring clamp is po-
sitioned with the projection side facing
inward.
12. Tighten the muffler bolt to the
specified torque.
1. Rear arm
2. Washer
3. Rear arm nut
1
2
3

Tightening torques:
Axle nut:
60 Nm (6.0 m·kgf, 43.4 ft·lbf)
Rear arm nut:
28.5 Nm (2.9 m·kgf, 20.6 ft·lbf)
Rear shock absorber mounting bolt:
22.5 Nm (2.3 m·kgf, 16.3 ft·lbf)
Tightening torques:
Exhaust manifold bolt:
8.5 Nm (0.9 m·kgf, 6.1 ft·lbf)
Exhaust chamber bolt:
17.5 Nm (1.8 m·kgf, 12.7 ft·lbf)
1. Exhaust chamber
2. Spring clamp
3. Muffler
Tightening torque:
Muffler bolt:
17.5 Nm (1.8 m·kgf, 12.7 ft·lbf)
1
2
3

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9

MOTORCYCLE CARE AND STORAGE
EAU40631
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 mo-
torcycle 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 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 abrasive
cleaning products, solvent orthinner, 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 after
washing.

MOTORCYCLE CARE AND STORAGE
7-3
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9

EAU40642
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 “S” (stop) po-
sition: Turn the fuel cock lever to“S”.
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 theninstall 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 turning
the engine over.
6. Lubricate all control cables and the
pivoting points of all levers and
pedals as well as of the center-
stand.
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.
NOTE:

Make any necessary repairs before
storing the motorcycle.

8-1
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SPECIFICATIONS
EAU2633G
Dimensions:
Overall length:
1245 mm (49.0 in)
Overall width:
575 mm (22.6 in)
Overall height:
715 mm (28.1 in)
Seat height:
485 mm (19.1 in)
Wheelbase:
855 mm (33.7 in)
Ground clearance:
105 mm (4.13 in)
Minimum turning radius:
1300 mm (51.2 in)
Weight:
With oil and fuel:
39.0 kg (86 lb)
Engine:
Engine type:
Air cooled 2-stroke
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
49.0 cm
3

Bore
×
stroke:
40.0
×
39.2 mm (1.57
×
1.54 in)
Compression ratio:
6.00 :1
Starting system:
KickstarterLubrication system:
Separate lubrication (Yamaha autolube)
Type:
YAMALUBE 2 or 2-stroke engine oil (JASO
FC grade) or (ISO EG-C or EG-D grade)

Engine oil quantity:
Quantity:
0.3 L (0.32 US qt) (0.26 Imp.qt)
Transmission oil:
Type:
YAMALUBE 4 (10W30) or SAE10W30 type
SE motor oil
Oil change quantity:
0.30 L (0.32 US qt) (0.26 Imp.qt)
Air filter:
Air filter element:
Wet element
Fuel:
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:
2.0 L (0.53 US gal) (0.44 Imp.gal)
Carburetor:
Manufacturer:
MIKUNI
Type
×
quantity:
VM12SC x 1
Spark plug (s):
Manufacturer/model:
NGK/BP4HS (AUS)(NZL)
NGK/BPR4HS
(AUT)(BEL)(CAN)(CHE)(DEU)(DNK)
(ESP)(FIN)(FRA)(GBR)(GRC)(IRL)(NLD)
(NOR)(PRT)(SWE)(ZAF)
Manufacturer/model:
DENSO/W14FPL (AUS)(NZL)
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Clutch:
Clutch type:
Wet, centrifugal automatic
Transmission:
Primary reduction system:
Spur gear
Primary reduction ratio:
63/33 (1.909)
Secondary reduction system:
Shaft drive
Secondary reduction ratio:
19/15
×
54/11 (6.218)
Chassis:
Frame type:
Steel tube backbone
Caster angle:
25.50 °
Trail:
50.0 mm (1.97 in)
Front tire:
Type:
With tube

SPECIFICATIONS
8-2
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89

Size:
2.50-10 4PR
Manufacturer/model:
BRIDGESTONE/KNOBBY
Manufacturer/model:
IRC/KNOBBY
Rear tire:
Type:
With tube
Size:
2.50-10 4PR
Manufacturer/model:
BRIDGESTONE/KNOBBY
Manufacturer/model:
IRC/KNOBBY
Tire air pressure (measured on cold
tires):
Front:
100 kPa (15 psi) (1.00 kgf/cm
2

)
Rear:
100 kPa (15 psi) (1.00 kgf/cm
2

)
Front wheel:
Wheel type:
Panel wheel
Rim size:
10x1.50
Rear wheel:
Wheel type:
Panel wheel
Rim size:
10x1.50
Front brake:
Type:
Drum brake
Operation:
Right hand operation
Rear brake:
Type:
Drum brake
Operation:
Left hand operation
Front suspension:
Type:
Telescopic fork
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
60.0 mm (2.36 in)
Rear suspension:
Type:
Unit swing
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
50.0 mm (1.97 in)
Electrical system:
Ignition system:
CDI

INDEX
A
Acceleration and deceleration ...................5-2
Accessories and replacement parts ........6-13
Air filter element, cleaning .........................6-8
Autolube pump, adjusting ........................6-16
B
Brake lever, front .......................................3-2
Brake lever, rear ........................................3-3
Brake levers, lubricating ..........................6-16
Brake shoes, checking ............................6-15
Braking ......................................................5-2
C
Cables, checking and lubricating .............6-15
Carburetor, adjusting ...............................6-10
Care ...........................................................7-1
Centerstand, checking and lubricating ....6-17
E
Engine break-in .........................................5-3
Engine idling speed .................................6-10
Engine oil ...................................................3-5
Engine, starting a warm .............................5-1
Engine stop switch.....................................3-1
F
Front and rear brake lever free play,
adjusting ................................................6-14
Front fork, checking .................................6-17
Fuel ............................................................3-3
Fuel cock ...................................................3-5
Fuel tank breather hose.............................3-5
Fuel tank cap .............................................3-3
H
Handlebar switch .......................................3-1
I
Identification numbers ...............................9-1
K
Kickstarter ................................................. 3-6
L
Labels, location of ..................................... 1-4
M
Maintenance and lubrication, periodic ....... 6-3
Maintenance, emission control system ..... 6-2
Middle and final gear cases....................... 6-8
Model label ................................................ 9-1
P
Parking ...................................................... 5-4
Part locations............................................. 2-1
Power reduction plate, removing ............... 6-6
Pre-operation check list ............................. 4-2
S
Safety information ..................................... 1-1
Seat ........................................................... 3-7
Spark arrester, cleaning ............................ 6-9
Spark plug, checking ................................. 6-5
Specifications ............................................ 8-1
Speed limiter and power reduction plate ... 3-1
Starter (choke) lever .................................. 3-6
Starting and warming up a cold engine ..... 5-1
Starting off ................................................. 5-2
Steering, checking ................................... 6-18
Storage ...................................................... 7-3
T
Throttle cable free play, checking............ 6-11
Throttle grip and cable, checking and
lubricating .............................................. 6-16
Tires ........................................................ 6-11
Tool kit ....................................................... 6-1
Transmission oil ........................................ 6-7
Troubleshooting....................................... 6-23Troubleshooting chart ............................. 6-24
V
Vehicle identification number .................... 9-1
W
Wheel bearings, checking ....................... 6-18
Wheel (front) ........................................... 6-19
Wheel (rear) ............................................ 6-20
Wheels .................................................... 6-13