2010 YAMAHA TZR50 engine

EAU19210
Panel B
T
o remove the panel
Remove the screws, and then take
the panel off.
1. Panel B
2. Screw
To install the panel
Place the panel in the original posi-
tion, and then install the screws.
EAUS1580
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 maintenance and lubrication
chart. In addition, the condition of the
spark plug can reveal the condition of
the engine.
To remove the spark plug
1. Remove panel A. (See page 6-8).
2. Remove the spark plug cap.
1. Spark plug cap
3. Remove the spark plug as
shown, using the spark plug
wrench, which is located in the
storage compartment. (See page
6-1).
1. Spark plug wrench
To check the spark plug
1. 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.
PERIODIC MAINTENANCE AND ADJUSTMENT
6-10
6
5WX-F8199-E3 7/11/08 16:51 Página 46

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, and
then 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 the
check 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. 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.4. Remove the oil filler cap, refill
with 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.
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)
Tightening torque:
Oil check bolt:
6 Nm (0.6 m•kgf, 4.3 ft•lbf)
PERIODIC MAINTENANCE AND ADJUSTMENT
6-12
6
5WX-F8199-E3 7/11/08 16:51 Página 48

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.
EAU39086
To check the coolant level
1. 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 the
coolant 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 the
minimum level mark, remove
panel A. (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]. NOTI-
CE: If coolant is not available,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 coo-
lant, 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
PERIODIC MAINTENANCE AND ADJUSTMENT
6-13
6
5WX-F8199-E3 7/11/08 16:51 Página 49

5. Install the panel.
EAUS1601
To change the coolant
1. Put the vehicle on a level surface
and let the engine cool if neces-
sary.
2. Remove cowling 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 bolt to
drain the cooling system.
1. Coolant drain bolt
6. Remove the coolant reservoir
cap.7. Disconnect the coolant reservoir
hose on the reservoir side and
drain the coolant from the reser-
voir.
1. Coolant reservoir
2. Coolant reservoir hose
8. After draining the coolant, tho-
roughly flush the cooling system
with clean tap water.
9. Replace the coolant drain bolt
washer if it is damaged, and then
tighten the coolant drain bolt to
the specified torque.
10. Connect the coolant reservoir
hose.
Tightening torque:
Coolant drain bolt:
9 Nm (0.9 m•kgf, 6.5 ft•lbf)
Coolant reservoir capacity (up to
the maximum level mark):
0.29 L (0.31 US qt, 0.26 Imp.qt)
PERIODIC MAINTENANCE AND ADJUSTMENT
6-14
6
5WX-F8199-E3 7/11/08 16:51 Página 50

11. Pour the recommended coolant
into the radiator until it is full.
12. Install the radiator cap.
13. Run the engine several minutes.
Stop the engine and recheck the
coolant level in the radiator. If it is
low, add more coolant until it rea-
ches the top of the radiator.
14. Install the radiator cap, radiator
cap retainer and radiator cap
retaining bolt.
15. Fill the coolant reservoir with
coolant up to the maximum level.
16. Install the coolant reservoir cap
and check for coolant leakage.TIP
If any leakage is found, ask a Yamaha
dealer to inspect the cooling system.
17. Install the cowling and the 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.Recommended antifreeze:
High quality ethylene glycol
antifreeze containing corrosion
inhibitors for aluminum engines
Antifreeze/water mixing ratio:
1:1
Coolant quantity:
Radiator capacity (including all
routes):
0.70 L (0.74 US qt, 0.62 Imp.qt)
Coolant reservoir capacity:
0.29 L (0.31 US qt, 0.26 Imp.qt)
PERIODIC MAINTENANCE AND ADJUSTMENT
6-15
6
5WX-F8199-E3 7/11/08 16:51 Página 51

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.
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.
Engine idling speed:
1250–1350 r/minNOTICE
PERIODIC MAINTENANCE AND ADJUSTMENT
6-16
6
5WX-F8199-E3 7/11/08 16:51 Página 52

EAU21370
Adjusting the throttle cable
free play
1. Throttle cable free play
The throttle cable free play should
measure 4.0–6.0 mm (0.16–0.24 in) at
the throttle grip. Periodically check
the throttle cable free play and, if
necessary, adjust it as follows.
TIP
The engine idling speed must be
correctly adjusted before checking
and adjusting the throttle cable free
play.
1. Loosen the locknut.2. To increase the throttle cable free
play, turn the adjusting nut in
direction (a). To decrease the
throttle cable free play, turn the
adjusting nut in direction (b).
1. Locknut
2. Adjusting nut
3. Tighten the locknut.
EAU21562
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.
EWA10501
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.
WARNING
PERIODIC MAINTENANCE AND ADJUSTMENT
6-17
6
5WX-F8199-E3 7/11/08 16:51 Página 53

EAU22760
Drive chain slack
The drive chain slack should be chec-
ked before each ride and adjusted if
necessary.
EAU22783
To check the drive chain slack
1. Drive chain slack
1. Place the motorcycle on the
sidestand.
TIP
When checking and adjusting the dri-
ve chain slack, there should be no
weight on the motorcycle.
2. Shift the transmission into the
neutral position.3. Move the rear wheel by pushing
the motorcycle to locate the tigh-
test portion of the drive chain,
and then measure the drive chain
slack as shown.
4. If the drive chain slack is inco-
rrect, adjust it as follows.
TIP
When checking the drive chain slack,
the chain tensioner should not be tou-
ching the drive chain.
EAU22921
To adjust the drive chain slack
1. Remove the cotter pin from the
axle nut, and then loosen the axle
nut.
2. Loosen the chain puller locknut
at each end of the swingarm.
3. To tighten the drive chain, turn
the drive chain slack adjusting
bolt on each end side of the
swingarm in direction (a). To loo-
sen the drive chain, turn the
adjusting bolt on each side of theswingarm in direction (b), and
then push the rear wheel forward.
NOTICE: Improper drive chain
slack will overload the engine
as well as other vital parts of
the motorcycle and can lead to
chain slippage or breakage. To
prevent this from occurring,
keep the drive chain slack wit-
hin the specified limits.
[ECA10571]
TIP
Using the alignment marks on each
side of the swingarm, make sure that
both chain pullers are in the same
position for proper wheel alignment.
1. Drive chain slack adjusting bolt
2. Chain puller locknut
3. Alignment marks
Drive chain slack:
20.0–25.0 mm (0.79–0.98 in)
PERIODIC MAINTENANCE AND ADJUSTMENT
6-24
6
5WX-F8199-E3 7/11/08 16:51 Página 60