warning YAMAHA PW50 2010 User Guide

OPERATION AND IMPORTANT RIDING POINTS
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EAU41002
Starting off
1. While applying the rear brake le-
ver, push the motorcycle off the
centerstand.
2. Completely close the throttle.
3. Set the engine stop switch to
“RUN”.
4. Check for oncoming off-road vehi-
cles, and then slowly turn the throt-
tle grip in order to take off.
EAU16780
Acceleration and deceleration
The speed can be adjusted by opening
and closing the throttle. To increase the
speed, turn the throttle grip in direction
(a). To reduce the speed, turn the throt-
tle grip in direction (b).
EAU41012
Braking
WARNING

EWA14571

Avoid braking hard or suddenly
(especially when leaning over to
one side), otherwise the motor-
cycle may skid or overturn.

Keep in mind that braking on
wet surfaces is much more diffi-
cult.

Ride slowly down a hill, as brak-
ing downhill can be very diffi-
cult.
1. Close the throttle completely.
2. Apply both front and rear brakes
simultaneously while gradually in-
creasing the pressure.
Front
(a)(b)

OPERATION AND IMPORTANT RIDING POINTS
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EAU40722
Parking
When parking, stop the engine, and
then turn the fuel cock lever to “S”
(stop).
WARNING

EWA10311

Since the engine and exhaust
system can become very hot,
park in a place where pedestri-
ans or children are not likely to
touch them and be burned.

Do not park on a slope or on soft
ground, otherwise the vehicle
may overturn, increasing the
risk of a fuel leak and fire.

Do not park near grass or other
flammable materials which
might catch fire.

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PERIODIC MAINTENANCE AND ADJUSTMENT
EAU41951
Periodic inspection, adjustment, and lu-
brication will keep your vehicle in the
safest and most efficient condition pos-
sible. Safety is an obligation of the vehi-
cle owner/operator. The most important
points of vehicle inspection, adjust-
ment, and lubrication are explained on
the following pages.
WARNING

EWA10321
Failure to properly maintain the ve-
hicle or performing maintenance ac-
tivities incorrectly may increase
your risk of injury or death during
service or while using the vehicle. If
you are not familiar with vehicle ser-
vice, have a Yamaha dealer perform
service.
WARNING

EWA15121
Turn off the engine when performing
maintenance unless otherwise
specified.

A running engine has moving
parts that can catch on body
parts or clothing and electricalparts that can cause shocks or
fires.

Running the engine while ser-
vicing can lead to eye injury,
burns, fire, or carbon monoxide
poisoning – possibly leading to
death. See page 2-1 for more in-
formation about carbon monox-
ide.
EAU17311
Owner’s tool kit
The service information included in this
manual and the tools provided in the
owner’s tool kit are intended to assist
you in the performance of preventive
maintenance and minor repairs. How-
ever, additional tools such as a torque
wrench may be necessary to perform
certain maintenance work correctly.
TIP

If you do not have the tools or experi-
ence required for a particular job, have
a Yamaha dealer perform it for you.

PERIODIC MAINTENANCE AND ADJUSTMENT
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2. Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
spark plug threads.
3. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
TIP

If a torque wrench is not available when
installing a spark plug, a good estimate
of the correct torque is 1/4–1/2 turn
past finger tight. However, the spark
plug should be tightened to the speci-
fied torque as soon as possible.
4. Install the spark plug cap.
EAU41102
Removing the power
reduction plate
To obtain full engine performance ca-
pability, removing the power reduction
plate is required.
1. Remove the exhaust manifold by
removing the bolts.
WARNING!
Always let the exhaust system
cool prior to touching exhaust
components.
[EWA14581]

2. Remove the gasket.
3. Remove the power reduction
plate.
TIP

Store the power reduction plate with the
Owner’s Manual so that it is readily
available whenever you want to reduce
the engine power.
4. Install the exhaust manifold by in-
stalling the bolts.
Tightening torque:
Spark plug:
20 Nm (2.0 m·kgf, 14.5 ft·lbf)
1. Exhaust manifold bolt
1

1. Exhaust manifold
2. Gasket
3. Power reduction plate
Tightening torque:
Exhaust manifold bolt:
8.5 Nm (0.9 m·kgf, 6.1 ft·lbf)
1
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PERIODIC MAINTENANCE AND ADJUSTMENT
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5. Insert the sponge material into the
air filter case.
NOTICE:
Make sure
that the sponge material is prop-
erly seated in the air filter case.
The engine should never be op-
erated without the sponge mate-
rial installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.

[ECA15621]

6. Install the air filter case cover by in-
stalling the screw.
7. Install the seat.
EAU41221
Cleaning the spark arrester
The spark arrester should be cleaned
at the intervals specified in the periodic
maintenance and lubrication chart.
WARNING

EWA10980

Always let the exhaust system
cool prior to touching exhaust
components.

Do not start the engine when
cleaning the exhaust system.
1. Remove the tailpipe by removing
the screw, and then pulling it out of
the muffler.2. Tap the tailpipe lightly, and then
use a wire brush to remove any
carbon deposits from the spark ar-
rester portion of the tailpipe and in-
side of the tailpipe housing.
Recommended oil:
Yamaha foam air filter oil or other
quality foam air filter oil
1. Tailpipe
2. Screw
3. Muffler
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PERIODIC MAINTENANCE AND ADJUSTMENT
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gine idling speed, turn the screw in
direction (b).
TIP

If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
EAU21382
Checking the throttle cable
free play
The throttle cable free play should mea-
sure 1.5–3.5 mm (0.06–0.14 in) at the
throttle grip. Periodically check the
throttle cable free play and, if neces-
sary, have a Yamaha dealer adjust it.
EAU40911
Tires
To maximize the performance, durabil-
ity, and safe operation of your motorcy-
cle, note the following points regarding
the specified tires.
Tire air pressure
The tire air pressure should be checked
and, if necessary, adjusted before each
ride.
WARNING

EWA14381
Operation of this vehicle with im-
proper tire pressure may cause se-
vere injury or death from loss of
control.

The tire air pressure must be
checked and adjusted on cold
tires (i.e., when the temperature
of the tires equals the ambient
temperature).

The tire air pressure must be ad-
justed in accordance with the
weight of the rider, the riding
speed, and the riding condi-
tions.
1. Throttle stop screw
Engine idling speed:
1650–1750 r/min
1(a) (b)

1. Throttle cable free play1

PERIODIC MAINTENANCE AND ADJUSTMENT
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9Tire inspection
The tires must be checked before each
ride. If the center tread depth reaches
the specified limit, if the tire has a nail or
glass fragments in it, or if the sidewall is
cracked, have a Yamaha dealer re-
place the tire immediately.
Tire information
This motorcycle is equipped with panel
wheels and tube tires.
WARNING

EWA10461
The front and rear tires should be of
the same make and design, other-
wise the handling characteristics of
the vehicle may be different, which
could lead to an accident.
After extensive tests, only the tires list-
ed below have been approved for this
model by Yamaha Motor Co., Ltd.
WARNING

EWA14390

Have a Yamaha dealer replace
excessively worn tires. Operat-ing the motorcycle with exces-
sively worn tires decreases
riding stability and can lead to
loss of control.

The replacement of all
wheel-and brake-related parts,
including the tires, should be
left to a Yamaha dealer, who has
the necessary professional
knowledge and experience.

It is not recommended to patch
a punctured tube. If unavoid-
able, however, patch the tube
very carefully and replace it as
soon as possible with a
high-quality product.
Standard tire air pressure:
Front:
100 kPa (1.00 kgf/cm
2

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

, 15 psi)
1. Tire sidewall
2. Tire tread depth
Minimum tire tread depth (front and
rear):
4.0 mm (0.16 in)
12

Front tire:
Size:
2.50-10 4PR
Manufacturer/model:
BRIDGESTONE/KNOBBY
IRC/KNOBBY
Rear tire:
Size:
2.50-10 4PR
Manufacturer/model:
BRIDGESTONE/KNOBBY
IRC/KNOBBY

PERIODIC MAINTENANCE AND ADJUSTMENT
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EAU40780
Panel wheels
WARNING

EWA10610
The wheels on this model are not de-
signed for use with tubeless tires.
Do not attempt to use tubeless tires
on this model.
To maximize the performance, durabil-
ity, and safe operation of your motorcy-
cle, note the following points regarding
the specified wheels.

The wheel rims should be checked
for cracks, bends, warpage or
damage before each ride. If any
damage is found, have a Yamaha
dealer replace the wheel. Do not
attempt even the smallest repair to
the wheel. A deformed or cracked
wheel must be replaced.

The wheel should be balanced
whenever either the tire or wheel
has been changed or replaced. An
unbalanced wheel can result in
poor performance, adverse han-
dling characteristics, and a short-
ened tire life.

Ride conservatively after changinga tire since the tire must seat itself
on the rim properly. Failure to al-
low proper seating may cause tire
failure, which may result in dam-
age to the motorcycle and injury to
the rider.
EAU22151
Adjusting the front and rear
brake lever free play
Front
Rear
The front and rear brake lever free play
1. Front brake lever free play
1. Rear brake lever free play
1
1

PERIODIC MAINTENANCE AND ADJUSTMENT
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should be measured at the positions as
shown.
Periodically check the front and rear
brake lever free play and, if necessary,
adjust them as follows.
To increase the brake lever free play,
turn the adjusting nut at the brake shoe
plate in direction (a). To decrease the
brake lever free play, turn the adjusting
nut in direction (b).
FrontRear
WARNING

EWA10650
If proper adjustment cannot be ob-
tained as described, have a Yamaha
dealer make this adjustment.
EAU41052
Checking the front and rear
brake shoes
The front and rear brake shoes must be
checked for wear at the intervals spec-
ified in the periodic maintenance and
lubrication chart.
TIP

The wheels must be removed to check
brake shoe lining thickness.

To remove the front wheel: See
page 7-18.

To remove the rear wheel: See
page 7-20.
Front
Front brake lever free play:
10.0–20.0 mm (0.39–0.79 in)
Rear brake lever free play:
10.0–20.0 mm (0.39–0.79 in)
1. Brake lever free play adjusting nut
1
(a)
(b)

1. Brake lever free play adjusting nut1
(a)(b)

PERIODIC MAINTENANCE AND ADJUSTMENT
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9 Rear
If the lining thickness of a brake shoe is
less than 1.5 mm (0.06 in), have a
Yamaha dealer replace the brake
shoes as a set.
TIP

Be sure to measure the brake lining at
the thinnest portion.
EAU41842
Checking and lubricating the
cables
The operation of all control cables and
the condition of the cables should be
checked before each ride, and the ca-
bles and cable ends should be lubricat-
ed if necessary. If a cable is damaged
or does not move smoothly, have a
Yamaha dealer check or replace it.
WARNING! Damage to the outer
housing of cables may result in in-
ternal rusting and cause interfer-
ence with cable movement. Replace
damaged cables as soon as possi-
ble to prevent unsafe condi-
tions.
[EWA10711]

EAU23111
Checking and lubricating the
throttle grip and cable
The operation of the throttle grip should
be checked before each ride. In addi-
tion, the cable should be lubricated at
the intervals specified in the periodic
maintenance chart.
Recommended lubricant:
Yamaha Chain and Cable Lube or
4-stroke engine oil