engine YAMAHA TW125 2000 Owner's Manual

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EC000070
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When removing the oil drain bolt,
the O-ring, compression spring,
and oil strainer will fall out. Take
care not to lose these parts.
1. Strainer
2. Compression spring
3. O-ring
NOTE:
The oil filter cover is secured by
two screws and a drain bolt.
Remove the drain bolt to drain the
filter cavity.
1. Bolts (´3)
2. Engine oil drain bolt
4. Remove the filter cover screws
and the oil filter cover.
5. Remove the oil filter element
and O-ring.
6. Clean the oil filter and strainer
with solvent. Replace if neces-
sary.
7. Check the O-rings. If damaged,
replace.
8. Install the filter cover, screws
and drain bolts. Tighten the
drain bolts to the specified
tightening torques.
NOTE:
Make sure the O-ring is seated
properly.
1. Oil filter element
2. O-ring
12 3
1 21
2
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EAU01501*Air filter
The air filter should be cleaned at
the specified intervals. It should be
cleaned more frequently when rid-
ing in unusually wet or dusty
areas.
Air filter element cleaning
1. Remove panel A. (See page
6-6 for removal and installa-
tion procedures.)
2. Remove the air filter case fit-
ting screws and the filter case
cover.
1. Air filter case cover
2. Screw (´4)EC000066
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8Do not put in any chemical
additives. Engine oil also lubri-
cates the clutch and additives
could cause clutch slippage.
8Be sure no foreign material
enters the crankcase.
10. Start the engine and warm up
for a few minutes. While
warming up, check for oil leak-
age. If oil leakage is found,
stop the engine immediately
and check for the cause.
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Before reinstalling the oil drain
bolt, do not forget to install the O-
ring, compression spring, and oil
strainer in position.
9. Fill the engine with oil. Install
the oil filler cap and tighten. Tightening torque:
Drain bolt:
43 Nm (4.3 m·kg)
Filter cover screw:
7.0 Nm (0.7 m·kg)
Drain bolt (filter cover):
10 Nm (1.0 m·kg)
Recommended oil:
See page 8-1.
Total amount:
1.3 L
Periodic oil change:
1.0 L
With oil filter replacement:
1.1 L
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9 3. Remove the air filter from the
case.
4. Remove the air filter element
from its frame and clean it
with solvent. After cleaning,
remove the remaining solvent
by squeezing the element.
5. Apply recommended oil to the
entire surface of the element
and squeeze out the excess oil.
The element should be wet but
not dripping.
1. Air filter element
2. Air filter element frame
6. Install the air filter frame onto
the air filter and install the
assembly in the case.
7. Install the air filter case cover
and panel.
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8Make sure the air filter is prop-
erly seated in the air filter
case.
8The engine should never be
run without the air filter
installed. Excessive piston
and/or cylinder wear may
result.
Air filter case drain hose cleaning
Frequently check the hose at the
bottom of the air filter case. If dirt
or water is visible, remove and
clean the hose, then reinstall it.
1. Hose
Recommended oil:
Engine oil
1
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EAU00629Carburetor adjustment
The carburetor is a vital part of the
engine and requires very sophisti-
cated adjustment. Most adjust-
ments should be left to a Yamaha
dealer who has the professional
knowledge and experience to do
so. However, the following may be
serviced by the owner as part of
routine maintenance.
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The carburetor was set at the
Yamaha factory after many tests. If
the settings are changed, poor
engine performance and damage
may result.
EAU01168Idle speed adjustment
NOTE:
A diagnostic tachometer must be
used for this procedure.
1. Attach the tachometer. Start
the engine and warm it up for
a few minutes at approximate-
ly 1,000 to 2,000 r/min.
Occasionally rev the engine to
4,000 to 5,000 r/min. The
engine is warm when it quickly
responds to the throttle.2. Set the idle to the specified
engine speed by adjusting the
throttle stop screw. Turn the
screw in direction ato
increase engine speed and in
direction bto decrease engine
speed.
NOTE:
If the specified idle speed cannot
be obtained by performing the
above adjustment, consult a
Yamaha dealer.
1. Throttle stop screw
1
ab
Standard idle speed:
1,300 ~ 1,500 r/min
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EAU00634Throttle cable free play
adjustment
NOTE:
Before checking the throttle cable
free play, the engine idling speed
should be adjusted.
Adjust the throttle cable by turning
the adjusting nut so that specified
free play at the throttle grip is
obtained.
1. Adjusting nut
2. Locknut
c. Free play
1. Loosen the locknut.
2. Turn the adjusting nut in direc-
tion ato increase free play
and in direction bto decrease
free play.
3. Tighten the locknut.
EAU00637Valve clearance adjustment
The correct valve clearance
changes with use, resulting in
improper fuel/air supply or engine
noise. To prevent this, the valve
clearance must be adjusted regu-
larly. This adjustment however,
should be left to a professional
Yamaha service technician.
1
2a
bc
Free play:
3 ~ 5 mm
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EC000096
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Too little chain slack will overload
the engine and other vital parts.
Keep the slack within the specified
limits.
4. Tighten the wheel axle nut to
the specified torque.
5. Adjust the brake pedal free
play.
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Check the operation of the brake
light after adjusting the rear brake.
EAU01106*Drive chain lubrication
The chain consists of many parts
which work with each other. If the
chain is not maintained properly, it
will wear out quickly. Therefore,
the chain must be serviced regular-
ly. This service is especially neces-
sary when riding in dusty areas.
The drive chain should be lubri-
cated every 500 km. First, remove
all dirt and mud from the chain
with a brush or cloth. Then, spray
any of the many brands of spray-
type chain lubricant between
both rows of side plates and on
all center rollers.
To clean the chain thoroughly,
remove it from the motorcycle,
dip it in solvent, and clean out as
much dirt as possible. Then, take
the chain out of the solvent to
dry it, and immediately lubricate
it to prevent it from rusting.
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Be sure to oil the chain after wash-
ing the motorcycle or riding in the
rain.
Tightening torque:
Wheel axle nut:
90 Nm (9.0 m·kg)
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EAU02962Cable inspection and
lubrication
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Damage to the outer housing of
cables may lead to internal rusting
and interfere with the cable move-
ment. Replace damaged cables as
soon as possible to prevent unsafe
conditions.
Lubricate the cables and cable
ends. If a cable does not operate
smoothly, ask a Yamaha dealer to
replace it.EAU00773Throttle cable and grip
lubrication
The throttle twist grip assembly
should be greased at the time that
the cable is lubricated, since the
grip must be removed to get at the
end of the throttle cable. After
removing the screws, hold the end
of the cable up in the air and put in
several drops of lubricant. With the
throttle grip disassembled, coat the
metal surface of the grip assembly
with a suitable all-purpose grease. Recommended lubricant:
Engine oil
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EAU02984Brake and shift pedal
lubrication
Lubricate the pivoting parts.
EAU02985Brake and clutch lever
lubrication
Lubricate the pivoting parts.
EAU02986Sidestand lubrication
Lubricate the sidestand pivoting
point and metal-to-metal contact
surfaces. Check that the sidestand
moves up and down smoothly.
EW000113
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If the sidestand does not move
smoothly, consult a Yamaha deal-
er.
Recommended lubricant:
Engine oilRecommended lubricant:
Engine oil
Recommended lubricant:
Engine oil
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EAU00794Steering inspection
Periodically inspect the condition
of the steering. Worn out or loose
steering bearings may be danger-
ous. Place a stand under the
engine to raise the front wheel off
the ground. Hold the lower end of
the front forks and try to move
them forward and backward. If any
free play can be felt, ask a Yamaha
dealer to inspect and adjust the
steering. Inspection is easier if the
front wheel is removed.
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Securely support the motorcycle
so there is no danger of it falling
over.
EAU01144Wheel bearings
If there is play in the front or rear
wheel hub or if the wheel does not
turn smoothly, have a Yamaha
dealer inspect the wheel bearings.
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92. Push the bulb inward and turn
it counterclockwise.
1. Screw (´2)
3. Place a new bulb in the socket.
Push the bulb inward and turn
it clockwise until it engages
into the socket.
4. Install the lens and the screws.
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Do not over-tighten the screws as
the lens may break.
1. Bulb
EAU01579Supporting the motorcycle
Since the Yamaha TW125 has no
centerstand, follow these precau-
tions when removing the front and
rear wheel or performing other
maintenance requiring the motor-
cycle to stand upright. Check that
the motorcycle is in a stable and
level position before starting any
maintenance. A strong wooden
box can be placed under the
engine for added stability.
Front wheel service
To stabilize the rear of the motor-
cycle, either use a motorcycle
stand or place a motorcycle jack
under the frame in front of the rear
wheel to prevent it from moving
from side to side. Then use a
motorcycle stand to elevate the
front wheel off of the ground.11
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