2008 YAMAHA PW50 fuel cap

TABLE OF CONTENTS
SAFETY INFORMATION
...................1-1
Safe riding ........................................1-1
Location of important labels .............1-4
DESCRIPTION
...................................2-1
Left view ...........................................2-1
Right view .........................................2-2
Controls and instruments..................2-3
INSTRUMENT AND CONTROL
FUNCTIONS
........................................3-1
Handlebar switch .............................3-1
Speed limiter and power reduction
plate .............................................3-1
Front brake lever .............................3-2
Rear brake lever ..............................3-3
Fuel tank cap ...................................3-3
Fuel ..................................................3-3
Fuel tank breather hose ...................3-5
2-stroke engine oil ...........................3-5
Fuel cock .........................................3-5
Starter (choke) lever “
1
” .................3-6
Kickstarter ........................................3-6
Seat .................................................3-7
PRE-OPERATION CHECKS
...............4-1
Pre-operation check list ...................4-2
OPERATION AND IMPORTANT
RIDING POINTS
.................................. 5-1
Starting and warming up a cold
engine .......................................... 5-1
Starting a warm engine ................... 5-1
Starting off ....................................... 5-2
Acceleration and deceleration ......... 5-2
Braking ............................................ 5-2
Engine break-in ............................... 5-3
Parking ............................................ 5-4
PERIODIC MAINTENANCE AND
MINOR REPAIR
.................................. 6-1
Owner’s tool kit ................................ 6-1
Periodic maintenance chart for the
emission control system .............. 6-2
General maintenance and lubrication
chart ............................................. 6-3
Checking the spark plug .................. 6-5
Removing the power reduction
plate ............................................. 6-6
Transmission oil .............................. 6-7
Middle and final gear cases ............ 6-8
Cleaning the air filter element ......... 6-8
Cleaning the spark arrester ............. 6-9
Adjusting the carburetor ................ 6-10
Adjusting the engine idling
speed ......................................... 6-10
Checking the throttle cable free
play ............................................ 6-11
Tires .............................................. 6-11Panel wheels ................................. 6-13
Accessories and replacement
parts ........................................... 6-13
Adjusting the front and rear brake
lever free play ............................ 6-14
Checking the front and rear brake
shoes ......................................... 6-15
Checking and lubricating the
cables ........................................ 6-15
Checking and lubricating the throttle
grip and cable ............................ 6-16
Adjusting the Autolube pump ........ 6-16
Lubricating the front and rear brake
levers ......................................... 6-16
Checking and lubricating the
centerstand ................................ 6-17
Checking the front fork .................. 6-17
Checking the steering ................... 6-18
Checking the wheel bearings ........ 6-18
Front wheel ................................... 6-19
Rear wheel .................................... 6-20
Troubleshooting ............................ 6-23
Troubleshooting chart ................... 6-24
MOTORCYCLE CARE AND
STORAGE
........................................... 7-1
Matte color caution .......................... 7-1
Care ................................................ 7-1
Storage ........................................... 7-3
SPECIFICATIONS
............................. 8-1

DESCRIPTION
2-3
1
2
3
4
5
6
7
8
9

EAU10430
Controls and instruments
12
7 345
6

1. Rear brake lever (page 3-3)
2. Starter (choke) lever (page 3-6)
3. 2-stroke engine oil tank cap (page 3-5)
4. Right handlebar switch (page 3-1)
5. Front brake lever (page 3-2)
6. Throttle grip (page 6-11)
7. Fuel tank cap (page 3-3)

INSTRUMENT AND CONTROL FUNCTIONS
3-3
2
34
5
6
7
8
9

EAU12950
Rear brake lever
The rear brake lever is located on the
left handlebar grip. To apply the rear
brake, pull this lever toward the handle-
bar grip.
EAU13181
Fuel tank cap
To remove the fuel tank cap, turn it
counterclockwise, and then pull it off.
To install the fuel tank cap, insert it into
the tank opening, and then turn it clock-
wise.
WARNING

EWA11090
Make sure that the fuel tank cap is
properly closed before riding.
EAU13220
Fuel
Make sure that there is sufficient fuel in
the tank. When refueling, be sure to in-
sert the pump nozzle into the fuel tank
filler hole and to fill the tank to the bot-
tom of the filler tube as shown.
WARNING

EWA10880

Do not overfill the fuel tank, oth-
erwise it may overflow when the
fuel warms up and expands.

Avoid spilling fuel on the hot en-
gine.
1. Rear brake lever
1

1. Fuel tank cap
1

1. Fuel tank filler tube
2. Fuel level
2 1

INSTRUMENT AND CONTROL FUNCTIONS
3-4
1
2
3
4
5
6
7
8
9
CAUTION:

ECA10070
Immediately wipe off spilled fuel
with a clean, dry, soft cloth, since
fuel may deteriorate painted surfac-
es or plastic parts.
EAU41980
For Canada
CAUTION:

ECA15590
Use only unleaded gasoline. The use
of leaded gasoline will cause severe
damage to internal engine parts,
such as the piston rings as well as to
the exhaust system.
Your Yamaha engine has been de-
signed to use regular unleaded gaso-
line with a pump octane number
[(R+M)/2] of 86 or higher, or a research
octane number of 91 or higher. Ifknocking (or pinging) occurs, use a
gasoline of a different brand or premi-
um unleaded fuel. Use of unleaded fuel
will extend spark plug life and reduce
maintenance cost.
Gasohol
There are two types of gasohol: gaso-
hol containing ethanol and that contain-
ing methanol. Gasohol containing
ethanol can be used if ethanol content
does not exceed 10%. Gasohol con-
taining methanol is not recommended
by Yamaha because it can cause dam-
age to the fuel system or vehicle perfor-
mance problems.
Except for Canada
CAUTION:

ECA15590
Use only unleaded gasoline. The useof leaded gasoline will cause severe
damage to internal engine parts,
such as the piston rings as well as to
the exhaust system.
Your Yamaha engine has been de-
signed to use regular unleaded gaso-
line with a research octane number of
91 or higher. If knocking (or pinging) oc-
curs, use a gasoline of a different brand
or premium unleaded fuel. Use of un-
leaded fuel will extend spark plug life
and reduce maintenance costs.
Recommended fuel:
REGULAR UNLEADED GASOLINE
ONLY
Fuel tank capacity:
2.0 L (0.53 US gal) (0.44 Imp.gal)
Recommended fuel:
For Europe: REGULAR UNLEADED
GASOLINE ONLY
Except for Canada and Europe: UN-
LEADED GASOLINE ONLY
Fuel tank capacity:
2.0 L (0.53 US gal) (0.44 Imp.gal)

INSTRUMENT AND CONTROL FUNCTIONS
3-5
2
34
5
6
7
8
9

EAU13412
Fuel tank breather hose
Before operating the motorcycle:

Check the fuel tank breather hose
connection.

Check the fuel tank breather hose
for cracks or damage, and replace
it if damaged.

Make sure that the fuel tank
breather hose is not blocked, and
clean it if necessary.
EAU13452
2-stroke engine oil
Make sure that there is sufficient
2-stroke engine oil in the oil tank. Add
the recommended 2-stroke engine oil
as necessary.
NOTE:

Make sure that the 2-stroke engine oil
tank cap is properly installed.
EAU40701
Fuel cock
The fuel cock supplies fuel from the
tank to the carburetor while filtering it al-
so.
The fuel cock has two positions:
S (stop)
With the lever in this position, fuel will
not flow. Always return the lever to this
position when the engine is not running.
1. Fuel tank breather hose
1

1. 2-stroke engine oil tank cap
2. Minimum level mark
Recommended oil:
See page 8-1.
Oil quantity:
0.30 L (0.32 US qt) (0.26 Imp.qt)
21

1. Arrow mark pointing to “S” (stop)
1

MOTORCYCLE CARE AND STORAGE
7-3
2
3
4
5
6
78
9 speeds, test the motorcycle’s
braking performance and cor-

nering behavior.
CAUTION:

ECA10800

Apply spray oil and wax spar-
ingly and make sure to wipe off
any excess.

Never apply oil or wax to any
rubber and plastic parts, but
treat them with a suitable care
product.

Avoid using abrasive polishing
compounds as they will wear
away the paint.
NOTE:

Consult a Yamaha dealer for advice on
what products to use.
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 then

8-1
2
3
4
5
6
7
89

SPECIFICATIONS
EAU2633K
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)

Engine oil:
Type:
YAMALUBE 2 or 2-stroke engine oil (JASO
FC grade) or (ISO EG-C or EG-D grade)
Engine oil quantity:
Quantity:
0.30 L (0.32 US qt) (0.26 Imp.qt)
Transmission oil:
Type:
YAMALUBE 4 (10W30) or SAE 10W30
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

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
Matte color, caution ...................................7-1
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 .........................................6-7Troubleshooting....................................... 6-23
Troubleshooting 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