2009 YAMAHA TTR50 torque

PERIODIC MAINTENANCE AND ADJUSTMENT
6-6
6 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.
TIPIf 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.
EAU39842
Engine oil The engine oil level should be checked
before each ride. In addition, the oil
must be changed at the intervals spec-
ified in the periodic maintenance and
lubrication chart.
To check the engine oil level
1. Place the motorcycle on a level
surface and hold it in an upright po-
sition. A slight tilt to the side can re-
sult in a false reading.
2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Wait a few minutes until the oil set-
tles, remove the oil filler cap, wipe
the dipstick clean, insert it back
into the oil filler hole (without
screwing it in), and then remove it
again to check the oil level.
TIPThe engine oil should be between theminimum and maximum level marks.
4. If the engine oil is at or below the
minimum level mark, add sufficient
oil of the recommended type to
raise it to the correct level.
5. Insert the dipstick into the oil filler
hole, and then tighten the oil filler
cap.
Tightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf, 9.0 ft·lbf)
1. Engine oil filler cap
2. Dipstick
3. Maximum level mark
4. Minimum level mark
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-7
6To change the engine oil
1. Start the engine, warm it up for
several minutes, and then turn it
off.
2. Place an oil pan under the engine
to collect the used oil.
3. Remove the engine oil filler cap
and drain bolt to drain the oil from
the crankcase.
4. Install the engine oil drain bolt, and
then tighten it to the specified
torque.5. Refill with the specified amount of
the recommended engine oil, and
then install and tighten the engine
oil filler cap.
NOTICE
ECA11620


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


Make sure that no foreign mate-rial enters the crankcase.6. Start the engine, and then let it idle
for several minutes while checking
it for oil leakage. If oil is leaking, im-
mediately turn the engine off and
check for the cause.
7. Turn the engine off, and then
check the oil level and correct it if
necessary.
1. Engine oil drain boltTightening torque:
Engine oil drain bolt:
20 Nm (2.0 m·kgf, 14 ft·lbf)
1
Recommended engine oil:
See page 8-1.
Oil change quantity:
0.80 L (0.85 US qt, 0.70 Imp.qt)
1.“CD” specification
2.“ENERGY CONSERVING II”
1
2
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-10
6 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.3. Insert the tailpipe into the muffler,
and then install and tighten the
bolts to the specified torque.
TIPMake sure to align the bolt holes wheninserting 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.NOTICE
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.
1. Bolt
2. Tailpipe
1. Spark arrester
1
Tightening torque:
Tailpipe bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-14
6
EAU21940
Spoke wheels To maximize the performance, durabil-
ity, and safe operation of your motor-
cycle, note the following points
regarding the specified wheels.

The wheel rims should be checked
for cracks, bends or warpage, and
the spokes for looseness or dam-
age before each ride. If any dam-
age 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 at moderate speeds after
changing a tire since the tire sur-
face must first be “broken in” for it
to develop its optimal characteris-
tics.
EAU46250
Adjusting the clutch free play The clutch free play must be checked
and, if necessary, adjusted as follows
at the intervals specified in the periodic
maintenance and lubrication chart.
1. Remove the clutch adjusting
screw cover by removing the
screws.
2. Loosen the locknut.
3. Slowly turn the clutch adjusting
screw in direction (a) until resis-
tance is felt, and then turn it 1/8
turn in direction (b).
TIPTurning the clutch adjusting screw in di-
rection (a) decreases clutch free play
and turning it in direction (b) increasesclutch free play.
4. Tighten the locknut to the specified
torque.
1. Screw
2. Clutch adjusting screw cover
1. Locknut
2. Clutch adjusting screw
Tightening torque:
Locknut:
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
U1P683E0.book Page 14 Tuesday, April 29, 2008 2:05 PM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-18
6 4. If the drive chain slack is incorrect,
adjust it as follows.
EAU40111
To adjust the drive chain slack
1. Loosen the brake pedal free play
adjusting nut, axle nut, and locknut
at each end of the swingarm.2. To tighten the drive chain, turn the
drive chain slack adjusting nut at
each end of the swingarm in direc-
tion (a). To loosen the drive chain,
turn the adjusting nut at each end
of the swingarm in direction (b),
and then push the rear wheel for-
ward. NOTICE: Improper drive
chain slack will overload the en-
gine 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 with-
in the specified limits.
[ECA10571]
TIPUsing the alignment marks on each
side of the swingarm, make sure that
both adjusting nuts are in the same po-sition for proper wheel alignment.
3. Tighten both locknuts and the axle
nut to the specified torques.
1. Drive chain slack
1. Brake pedal free play adjusting nut
2. Drive chain slack adjusting nut
3. Locknut
1
2
3
1. Axle nut
2. Locknut
3. Drive chain slack adjusting nut
4. Alignment marks
Tightening torques:
Locknut:
7 Nm (0.7 m·kgf, 5.1 ft·lbf)
Axle nut:
60 Nm (6.0 m·kgf, 43 ft·lbf)1(b) 4(a)
2
3
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-27
64. Lift the front wheel off the ground
according to the procedure on
page 6-25.
5. Remove the axle nut and washer.
6. Pull the wheel axle out, and then
remove the wheel.
EAU39801
To install the front wheel
1. Lift the wheel up between the fork
legs.
2. Insert the wheel axle from the
right-hand side.TIPMake sure that the slot in the brake
shoe plate fits over the retainer on thefork leg.3. Lower the front wheel so that it is
on the ground.
4. Install the washer and axle nut,
and then tighten the axle nut to the
specified torque.
5. Connect the brake cable to the
brake camshaft lever, and then in-
stall the brake cable free play ad-
justing nut on the brake cable.
6. Adjust the brake lever free play.
(See page 6-15.)7. While applying the front brake,
push down hard on the handlebar
several times to check for proper
fork operation.
8. Install each front fork leg guard by
installing the bolts.1. Wheel axle
1. Slot
2. RetainerTightening torque:
Axle nut:
35 Nm (3.5 m·kgf, 25 ft·lbf)
2
1
U1P683E0.book Page 27 Tuesday, April 29, 2008 2:05 PM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-29
67. Remove the wheel.
EAU39781
To install the rear wheel
1. Install the drive chain onto the rear
sprocket, and then install the
wheel by inserting the wheel axle
from the right-hand side.TIPMake sure that the slot in the brake
shoe plate fits over the retainer on theswingarm.
2. Connect the brake rod to the brake
camshaft lever, and then install the
brake pedal free play adjusting nut
onto the brake rod.3. Adjust the drive chain slack. (See
page 6-17.)
4. Install the washer and axle nut,
and then lower the rear wheel so
that it is on the ground.
5. Tighten the axle nut to the speci-
fied torque.
6. Adjust the brake pedal free play.
(See page 6-16.)
EAU25851
Troubleshooting Although Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur dur-
ing operation. Any problem in the fuel,
compression, or ignition systems, for
example, can cause poor starting and
loss of power.
The following troubleshooting chart
represents a quick and easy procedure
for checking these vital systems your-
self. However, should your motorcycle
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the motorcycle
properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look like
Yamaha parts, but they are often inferi-
or, have a shorter service life and can
lead to expensive repair bills.
WARNING
EWA15141
When checking the fuel system, do
not smoke, and make sure there are
no open flames or sparks in the ar-
ea, including pilot lights from water
1. Slot
2. Retainer
Tightening torque:
Axle nut:
60 Nm (6.0 m·kgf, 43 ft·lbf)
U1P683E0.book Page 29 Tuesday, April 29, 2008 2:05 PM