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3. Remove the spark plug asshown, using the spark plug
wrench, which is located in the
storage compartment. (See page
6-1).
1. Spark plug wrench
To check the spark plug1. Check that the porcelain insula- tor around the center electrode of
the spark plug is a medium-to-
light tan (the ideal color when the
vehicle is ridden normally).
TIP
If the spark plug shows a distinctly
different color, the engine could be
operating improperly. Do not attempt
to diagnose such problems yourself. Instead, have a Yamaha dealer check
the vehicle.
2. Check the spark plug for electro-
de erosion and excessive carbon
or other deposits, and replace it if
necessary.
To install the spark plug 1. Measure the spark plug gap with a wire thickness gauge and, if
necessary, adjust the gap to spe-
cification.
1. Spark plug gap
2. Clean the surface of the sparkplug gasket and its mating surfa-
ce, and then wipe off any grime
from the spark plug threads.
3. Install the spark plug with the spark plug wrench, and then
tighten 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. Howe-
ver, the spark plug should be tighte-
ned to the specified torque as soon
as possible.
4. Install the spark plug cap.
5. Install the panel.
Tightening torque:Spark plug: 22.5 Nm (2.2 m•kgf, 16.3 ft•lbf)
Spark plug gap:0.6–0.7 mm (0.024–0.028 in)
1
Specified spark plug:NGK / BR9 ES
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EAUS1591
Transmission oil
The transmission oil level should be
checked before each ride. In addition,
the oil must be changed at the inter-
vals specified in the periodic mainte-
nance and lubrication chart.
To check the transmission oil level
1. Transmission oil filler cap
2. Transmission oil check bolt
1. Remove cowling A. (See page 6-8).
2. Place the vehicle on a level surfa- ce and hold it in an upright posi-
tion.
TIP
Make sure that the vehicle is positio-
ned straight up when checking the oil
level. A slight tilt to the side can result
in a false reading.
3. Remove the oil check bolt, andthen check the oil level.
TIP
The oil should be at the brim of the
check hole.
4. If the oil is below the brim of thecheck hole, remove the oil filler
cap, add sufficient oil of the
recommended type to raise it to
the correct level, and then install
the oil filler cap.
5. Install the oil check bolt, and then tighten it to the specified torque. To change the transmission oil
1. Transmission oil check bolt
2. Transmission oil drain bolt
3. Washer
1. Place an oil pan under the trans-
mission oil case to collect the
used oil.
2. Remove the drain bolt and the oil check bolt to drain the oil.
3. Install the drain bolt and the check bolt, and then tighten them
to the specified torques.
Tightening torque:Oil check bolt: 6 Nm (0.6 m•kgf, 4.3 ft•lbf)
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4. Remove the oil filler cap, refillwith the specified amount of the
recommended transmission oil,
and then install and tighten the oil
filler cap. NOTICE: Make sure
that no foreign material enters
the transmission case.
[ECAM1021]
5. Start the engine and let it idle for several minutes while checking
the transmission oil case for oil
leakage. If oil is leaking, imme-
diately turn the engine off and
check for the cause.
EAU20070
Coolant
The coolant level should be checked
before each ride. In addition, the coo-
lant must be changed at the intervals
specified in the periodic maintenance
and lubrication chart.
EAU39087
To check the coolant level1. Place the vehicle on a level surfa- ce and hold it in an upright posi-
tion.
TIP
The coolant level must be chec-
ked on a cold engine since the
level varies with engine tempera-
ture.
Make sure that the vehicle is
positioned straight up when
checking the coolant level. A
slight tilt to the side can result in
a false reading.
2. Check the coolant level in thecoolant reservoir.
TIP
The coolant should be between the
minimum and maximum level marks.
1. Coolant reservoir
2. Maximum level mark
3. Minimum level mark
3. If the coolant is at or below theminimum level mark, remove
panel A to access the coolant
reservoir. (See page 6-8).
4. Remove the coolant reservoir cap, add coolant to the maxi-
mum level mark, and then install
the reservoir cap. WARNING!
Remove only the coolant reser-
voir cap. Never attempt to
remove the radiator cap when
the engine is hot.
[EWA15161]
Recommended transmission oil: See page 8-1
Oil change quantity: 0.75 L (0.79 US qt, 0.66 Imp.qt)
Tightening torque:Transmission oil drain bolt: 17.5 Nm (1.7 m•kgf, 12.7 ft•lbf)
Oil check bolt: 6 Nm (0.6 m•kgf, 4.3 ft•lbf)
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NOTICE: If coolant is not avai-
lable, use distilled water or soft
tap water instead. Do not use
hard water or salt water since it
is harmful to the engine. If
water has been used instead of
coolant, replace it with coolant
as soon as possible, otherwise
the cooling system will not be
protected against frost and
corrosion. If water has been
added to the coolant, have a
Yamaha dealer check the anti-
freeze content of the coolant
as soon as possible, otherwise
the effectiveness of the coolant
will be reduced.
[ECA10472]
1. Coolant reservoir cap
5. Install the panel.
EAUS2070
To change the coolant 1. Place the vehicle on a level surfa- ce and let the engine cool if
necessary.
2. Remove cowlings A, B and C and panel A. (See page 6-8).
3. Place a container under the engi- ne to collect the used coolant.
4. Remove the radiator cap retai- ning bolt, radiator cap retainer
and radiator cap. WARNING!
Never attempt to remove the
radiator cap when the engine is
hot.
[EWA10381]
1. Radiator cap retaining bolt
2. Radiator cap
3. Radiator cap retainer
5. Remove the coolant drain boltand its gasket to drain the coo-
ling system.
1. Coolant drain bolt
2. Gasket
Coolant reservoir capacity (up to
the maximum level mark):0.29 L (0.31 US qt, 0.26 Imp.qt)
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6. Remove the coolant reservoircap.
1. Coolant reservoir cap
7. Move the hose clamp in thedirection shown, and then dis-
connect the coolant reservoir
hose to drain the reservoir.
1. Hose clamp
2. Coolant reservoir hose
3. Coolant reservoir
8. After the coolant is completely
drained, thoroughly flush the
cooling system with clean tap
water.
9. Connect the coolant reservoir hose, and then move the hose
clamp back to its original posi-
tion.
10. Install the coolant drain bolt and its new gasket, and then tighten
the bolt to the specified torque.
11. Pour the recommended coolant into the reservoir to the maximum
level mark, and then install the
coolant reservoir cap.
12. Pour the recommended coolant into the radiator until it is full. 13. Install the radiator cap, start the
engine, let it idle for several minu-
tes, and then turn it off.
14. Remove the radiator cap to check the coolant level in the
radiator. If necessary, add suffi-
cient coolant until it reaches the
top of the radiator, and then ins-
tall the radiator cap, retainer and
retaining bolt.
15. Check the coolant level in the reservoir. If necessary, remove
the coolant reservoir cap, add
coolant to the maximum level
mark, and then install the cap.Antifreeze/water mixture ratio:1:1
Recommended antifreeze: High-quality ethylene glycol
antifreeze containing corrosion
inhibitors for aluminum engines
Coolant quantity: Radiator capacity (including all
routes): 0.70 L (0.74 US qt, 0.62 Imp.qt)
Coolant reservoir capacity (up to
the maximum level mark): 0.29 L (0.31 US qt, 0.26 Imp.qt)
Tightening torque:Coolant drain bolt: 9 Nm (0.9 m•kgf, 6.5 ft•lbf)
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16. Start the engine, and then checkthe vehicle for coolant leakage. If
coolant is leaking, have a Yama-
ha dealer check the cooling sys-
tem.
17. Install the cowlings and panel.EAU40371
Air filter element
The air filter element should be clea-
ned or replaced at the intervals speci-
fied in the periodic maintenance and
lubrication chart. Have a Yamaha
dealer clean or replace the air filter
element.
EAU21280
Adjusting the carburetor
The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, most
carburetor adjustments should be left
to a Yamaha dealer, who has the
necessary professional knowledge
and experience. The adjustment des-
cribed in the following section, howe-
ver, may be serviced by the owner as
part of routine maintenance.
ECA10550
The carburetor has been set and
extensively tested at the Yamaha
factory. Changing these settings
without sufficient technical know-
ledge may result in poor perfor-
mance of or damage to the engine.
NOTICE
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EAU33482
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 lubrica-
tion chart.
The engine should be warm before
making this adjustment.1. Remove panel B. (See page 6-8).
2. Check the engine idling speed and, if necessary, adjust it to spe-
cification by turning the idle
adjusting screw. To increase the
engine idling speed, turn the
screw in direction (a). To decrea-
se the engine idling speed, turn
the screw in direction (b).
1. Idle adjusting screw
TIP
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
3. Install the panel.
EAU21374
Adjusting the throttle grip
free play
1. Throttle grip free play
The throttle grip free play should mea-
sure 4.0-6.0 mm (0.16-0.24 in) as
shown. Periodically check the throttle
grip free play and, if necessary, adjust
it as follows.
TIP
The engine idling speed must be
correctly adjusted before checking
and adjusting the throttle grip free
play.
1. Loosen the locknut.
Engine idling speed:1250–1350 r/min
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2. To increase the throttle grip freeplay, turn the throttle grip free
play adjusting nut in direction (a).
To decrease the throttle grip free
play, turn the adjusting nut in
direction (b).
1. Locknut
2. Throttle grip free play adjusting nut
3. Tighten the locknut.
EAU21565
Tires
To maximize the performance, durabi-
lity, and safe operation of your
motorcycle, note the following points
regarding the specified tires.
Tire air pressure
The tire air pressure should be chec-
ked and, if necessary, adjusted befo-
re each ride.
EWA10503
Operation of this vehicle with
improper tire pressure may cause
severe injury or death from loss of
control.
The tire air pressure must be
checked and adjusted on cold
tires (i.e., when the temperatu-
re of the tires equals the
ambient temperature).
The tire air pressure must be
adjusted in accordance with
the riding speed and with the
total weight of rider, passenger,
cargo, and accessories appro-
ved for this model.
EWA10511
Never overload your vehicle. Ope-
ration of an overloaded vehicle
could cause an accident.
WARNING
Tire air pressure (measured on
cold tires):0–90 kg (0–198 lb): Front:180 kPa (1.80 kgf/cm
2,
26 psi, 1.80 bar)
Rear: 200 kPa (2.00 kgf/cm
2,
29 psi, 2.00 bar)
90–193 kg (198–425 lb): Front:190 kPa (1.90 kgf/cm
2,
28 psi, 1.90 bar)
Rear: 230 kPa (2.30 kgf/cm
2,
33 psi, 2.30 bar)
Maximum load*: 196 kg (432 lb)
* Total weight of rider, passenger, cargo and accessories WARNING
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