2008 YAMAHA PW50 check engine

PERIODIC MAINTENANCE AND MINOR REPAIR
6-4
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9
NOTE:

The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
10
*Transmission oil
Check for oil leakage .Correct if necessary.Change.
11
*Front and rear brake
lever pivot
Apply lithium-soap-based grease (all-purpose
grease) lightly.
12
*Centerstand pivot
Check operation.Apply lithium-soap-based grease (all-purpose
grease) lightly.
13
*Shock absorber
assemblies
Check operation and for oil leakage.Replace if necessary.
14
*Control cable
Apply Yamaha chain and cable lube or engine oil
10W-30 lightly.
15
*Throttle grip housing
and cable
Check operation and free play.Apply Yamaha chain and cable lube or engine oil
10W-30 lightly. NO. ITEM CHECK OR MAINTENANCE JOBINITIALTHEREAFTER
EVERY
1
month3
months6
months6
months12
months

PERIODIC MAINTENANCE AND MINOR REPAIR
6-5
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67
8
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EAU19603
Checking the spark plug
The spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause any
spark plug to slowly erode, the spark
plug should be removed and checked
in accordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can re-
veal the condition of the engine.
To remove the spark plug
1. Remove the spark plug cap.
2. Remove the spark plug as shown,
with the spark plug wrench includ-
ed in the owner’s tool kit.
To check the spark plug
1. Check that the porcelain insulator
around the center electrode of the
spark plug is a medium-to-light tan
(the ideal color when the vehicle is
ridden normally).
NOTE:

If the spark plug shows a distinctly dif-
ferent color, the engine could be oper-
ating improperly. Do not attempt to
diagnose such problems yourself. In-
stead, have a Yamaha dealer check
the vehicle.
2. Check the spark plug for electrode
erosion and excessive carbon or
other deposits, and replace it ifnecessary.
To install the spark plug
1. Measure the spark plug gap with a
wire thickness gauge and, if nec-
essary, adjust the gap to specifica-
tion.
2. Clean the surface of the spark plug
1. Spark plug cap
1

1. Spark plug wrench
1

Specified spark plug:
NGK/BP4HS (AUS)(NZL)
NGK/BPR4HS
(AUT)(BEL)(CAN)(CHE)(DEU)
(DNK)(ESP)(FIN)(FRA)(GBR)(GRC)
(IRL)(NLD)(NOR)(PRT)(SWE)(ZAF)
DENSO/W14FPL (AUS)(NZL)
1. Spark plug gap
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
1

PERIODIC MAINTENANCE AND MINOR REPAIR
6-7
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67
8
9

EAU40891
Transmission oil
The transmission oil must be checked
for oil leakage before each ride. If any
leakage is found, have a Yamaha deal-
er check and repair the motorcycle. In
addition, the transmission oil must be
changed at the intervals specified in the
periodic maintenance and lubrication
chart.
1. Place the motorcycle on the cen-
terstand.
2. Place an oil pan under the trans-
mission to collect the used oil.
3. Remove the oil filler cap and drain
bolt to drain the oil from the trans-
mission.4. Install the transmission oil drain
bolt, and then tighten it to the spec-
ified torque.
5. Add the specified amount of the
recommended transmission oil,
and then install and tighten the oil
filler cap.
CAUTION:

ECA10452

In order to prevent clutch slip-
page (since the transmission oil
also lubricates the clutch), do
not mix any chemical additives.
Do not use oils with a diesel
specification of “CD” or oils of a
higher quality than specified. In
addition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.

Make sure that no foreign mate-
rial enters the transmission.
6. Start the engine, and then let it idle
for several minutes while checking
the transmission for oil leakage. If
oil is leaking, immediately turn the
engine off and check for the cause.
1. Transmission oil filler cap
1

1. Transmission oil drain bolt
Tightening torque:
Transmission oil drain bolt:
14 Nm (1.4 m·kgf, 10.1 ft·lbf)
Recommended transmission oil:
See page 8-1.
Oil change quantity:
0.30 L (0.32 US qt) (0.26 Imp.qt)
1

PERIODIC MAINTENANCE AND MINOR REPAIR
6-10
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3. Insert the tailpipe into the muffler,
and then install and tighten the
screw.
NOTE:

Make sure to align the screw hole when
inserting the tailpipe.
EAU39930
Adjusting the carburetor
The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, most car-
buretor adjustments should be left to a
Yamaha dealer, who has the neces-
sary professional knowledge and expe-
rience. The adjustment described in the
following section, however, may be ser-
viced by the owner as part of routine
maintenance.
CAUTION:

ECA10550
The carburetor has been set and ex-
tensively tested at the Yamaha fac-
tory. Changing these settings
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
EAU21360
Adjusting the engine idling
speed
The engine idling speed must be
checked and, if necessary, adjusted as
follows at the intervals specified in the
periodic maintenance and lubrication
chart.
NOTE:

A diagnostic tachometer is needed to
make this adjustment.
1. Attach the tachometer to the spark
plug lead.
2. Start the engine and warm it up
for several minutes at 1000–2000
r/min while occasionally revving it
to 4000–5000 r/min.
NOTE:

The engine is warm when it quickly re-
sponds to the throttle.
3. Check the engine idling speed
and, if necessary, adjust it to spec-
ification by turning the throttle stop
screw. To increase the engine
idling speed, turn the screw in di-
rection (a). To decrease the en-
gine idling speed, turn the screw in
1. Spark arrester
1

PERIODIC MAINTENANCE AND MINOR REPAIR
6-11
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direction (b).
NOTE:

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.
EAU40910
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

EWA14380

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
Standard tire air pressure:
Front:
100 kPa (15 psi) (1.00 kgf/cm
2

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

)

PERIODIC MAINTENANCE AND MINOR REPAIR
6-15
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3
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5
67
8
9

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.
NOTE:

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

To remove the front wheel: See
page 6-19.

To remove the rear wheel: See
page 6-20.
FrontRear
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.
NOTE:

Be sure to measure the brake lining at
the thinnest portion.
EAU41840
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

EWA10710
Damage to the outer housing of ca-
bles may result in internal rusting
and cause interference with cable
movement. Replace damaged ca-
bles as soon as possible to prevent
unsafe conditions.
Recommended lubricant:
Yamaha Chain and Cable Lube or
engine oil SAE 10W-30 (API SE)

PERIODIC MAINTENANCE AND MINOR REPAIR
6-16
1
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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.
EAU23120
Adjusting the Autolube pump
The Autolube pump is a vital and so-
phisticated component of the engine,
which must be adjusted by a Yamaha
dealer at the intervals specified in the
periodic maintenance and lubrication
chart.
EAU43630
Lubricating the front and rear
brake levers
The pivoting points of the front and rear
brake levers must be lubricated at the
intervals specified in the periodic main-
tenance and lubrication chart.
Recommended lubricant:
Lithium-soap-based grease (all-pur-
pose grease)

PERIODIC MAINTENANCE AND MINOR REPAIR
6-18
1
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EAU23280
Checking the steering
Worn or loose steering bearings may
cause danger. Therefore, the operation
of the steering must be checked as fol-
lows at the intervals specified in the pe-
riodic maintenance and lubrication
chart.
1. Place a stand under the engine to
raise the front wheel off the
ground.
WARNING

EWA10750
Securely support the vehicle so that
there is no danger of it falling over.
2. Hold the lower ends of the front
fork legs and try to move them for-
ward and backward. If any free
play can be felt, have a Yamaha
dealer check or repair the steering.
EAU23290
Checking the wheel bearings
The front and rear wheel bearings must
be checked at the intervals specified in
the periodic maintenance and lubrica-
tion chart. If there is play in the wheel
hub or if the wheel does not turn
smoothly, have a Yamaha dealer check
the wheel bearings.