2001 YAMAHA TW125 engine

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OPERATION AND IMPORTANT RIDING POINTS
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ParkingWhen parking, stop the engine,
remove the key from the main switch,
and then turn the fuel cock lever to
ÒOFFÓ.
EW000058
w8Since the engine and exhaust
system can become very hot,
park in a place where pedestri-
ans or children are not likely
to touch them.
8Do not park on a slope or on
soft ground, otherwise the
motorcycle may overturn.1. Arrow mark positioned over ÒOFFÓ
RES
ONFUEL
OFF
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6-3
PERIODIC MAINTENANCE AND MINOR REPAIR
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*Wheels¥ Check runout, spoke tightness and for damage.
¥ Tighten spokes if necessary.ÖÖÖÖ
11*Tires¥ Check tread depth and for damage.
¥ Replace if necessary.
¥ Check air pressure.
¥ Correct if necessary.ÖÖÖÖ
12*Wheel bearings¥ Check bearing for looseness or damage.ÖÖÖÖ
13*Swingarm¥ Check operation and for excessive play.ÖÖÖÖ
¥ Lubricate with lithium-soap-based grease. Every 24,000km
14 Drive chain¥ Check chain slack.
¥ Make sure that the rear wheel is properly aligned.
¥ Clean and lubricate.Every 500 km and after washing
the motorcycle in the rain
15*Steering bearings¥ Check bearing play and steering for roughness.ÖÖÖÖÖ
¥ Lubricate with lithium-soap-based greaseEvery 24,000km
16*Chassis fasteners¥ Make sure that all nuts, bolts and screws are properly tightened.ÖÖÖÖ Ö
17 Sidestand¥ Check operation.
¥ Lubricate.ÖÖÖÖ Ö
18*Sidestand switch¥ Check operation.ÖÖÖÖÖ Ö
19*Front fork¥ Check operation and for oil leakage.ÖÖÖÖ
20*Rear shock absorber
assembly pivoting
points¥ Check operation and shock absorber for oil leakage.ÖÖÖÖ
¥ Lubricate with lithium-soap-based grease.ÖÖ
21*Carburetor¥ Check starter (choke) operation.
¥ Adjust engine idling speed.ÖÖÖÖÖ Ö NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (´1,000 km)
ANNUAL
CHECK
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6-4
PERIODIC MAINTENANCE AND MINOR REPAIR
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NOTE:
8The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
8Hydraulic brake service
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Regularly check and, if necessary, correct the brake fluid level.
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Every two years replace the internal components of the brake master cylinder and caliper, and change the brake fluid.
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Replace the brake hoses every four years and if cracked or damaged.
22 Engine oil¥ Change.ÖÖÖÖÖ Ö
23 Engine oil filter element¥ Replace.ÖÖÖ
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*Engine oil strainer¥ Clean.ÖÖÖ
25*Front and rear brake
switches¥ Check operation.ÖÖÖÖÖ Ö
26 Moving parts and cables¥ Lubricate.ÖÖÖÖ Ö
27*Lights, signals and
switches¥ Check operation.
¥ Adjust headlight beam.ÖÖÖÖÖ Ö NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (´1,000 km)
ANNUAL
CHECK
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6-7
PERIODIC MAINTENANCE AND MINOR REPAIR
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Checking the spark plugThe 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.
1. Spark plug wrenchTo remove the spark plug
1. Remove the spark plug cap.
2. Remove the spark plug as
shown, with the spark plug
wrench included in the ownerÕs
tool kit.
1
To install the panelPlace the panel in the original posi-
tion.
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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
motorcycle is ridden normally).NOTE:
If the spark plug shows a distinctly
different color, the engine could be
defective. Do not attempt to diagnose
such problems yourself. Instead,
have a Yamaha dealer check the
motorcycle.2. Check the spark plug for elec-
trode erosion and excessive car-
bon or other deposits, and
replace it if necessary.
NOTE:
If a torque wrench is not available
when installing a spark plug, a good
estimate of the correct torque is
1/4Ð1/2 turn past finger tight.
However, the spark plug should be
tightened to the specified torque as
soon as possible.4. Install the spark plug cap.
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PERIODIC MAINTENANCE AND MINOR REPAIR
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9 Specified spark plug:
DR8EA (NGK)
a
a. Spark plug gapTo install the spark plug
1. Measure the spark plug gap with
a wire thickness gauge and, if
necessary, adjust the gap to
specification.
2. Clean the surface of the spark
plug gasket and its mating sur-
face, 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. Spark plug gap:
0.6Ð0.7 mm
Tightening torque:
Spark plug:
17.5 Nm (1.75 mákg)
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6-9
PERIODIC MAINTENANCE AND MINOR REPAIR
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93. Wait a few minutes until the oil
settles, and then check the oil
level through the check window
located at the bottom-left side of
the crankcase.
NOTE:
The engine oil should be between the
minimum and maximum level marks.4. If the engine oil is below the
minimum level mark, add suffi-
cient oil of the recommended
type to raise it to the correct
level.1. Engine oil level check window
2. Maximum level mark
3. Minimum level mark
To change the engine oil (with or
without oil filter element cleaning)
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.1. Engine oil filler cap
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Engine oil and oil filter
elementThe engine oil level should be
checked before each ride. In addition,
the oil must be changed and the oil
filter element cleaned at the intervals
specified 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
position.NOTE:
Make sure that the motorcycle is
positioned straight up when checking
the oil level. A slight tilt to the side
can result in a false reading.2. Start the engine, warm it up for
several minutes, and then turn it
off.
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PERIODIC MAINTENANCE AND MINOR REPAIR
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1. Engine oil drain bolt
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EC000070
cCWhen removing the engine oil
drain bolt, the O-ring, spring, and
oil strainer will fall out. Take care
not to lose these parts. 1. Strainer
2. Compression spring
3. O-ring
4. Remove the oil filter element
drain bolt to drain the oil from the
oil filter element.NOTE:
Skip steps 5Ð9 if the oil filter element
is not being cleaned.1. Oil filter element cover
2. Screw (´2)
3. Oil filter element drain bolt
12 3
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PERIODIC MAINTENANCE AND MINOR REPAIR
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912. Add the specified amount of the
recommended engine oil, and
then install and tighten the oil
filler cap. 9. Install the oil filter element cover
by installing the screws and the
drain bolt. Then tightening them
to the specified torque.
NOTE:
Make sure that the O-rings are prop-
erly seated.10. Clean the oil strainer with sol-
vent, and then check it for dam-
age and replace it if necessary.
11. Install the oil strainer, spring, O-
ring and engine oil drain bolt,
and then tighten the drain bolt to
the specified torque.Tightening torque:
Engine oil drain bolt:
43 Nm (4.3 mákg)
5. Remove the oil filter element
cover by removing the screws.
6. Remove the oil filter element and
O-rings.
7. Check the O-rings for damage
and replace it if necessary.
8. Clean the oil filter element with
solvent, and then install it. NOTE:
Check the oil filter element for dam-
age and replace it if necessary.1. Oil filter element
2. O-ring (´2)
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Tightening torques:
Oil filter element cover screw:
7.0 Nm (0.7 mákg)
Oil filter element drain bolt:
10 Nm (1.0 mákg)
Recommended engine oil:
See page 8-1.
Oil quantity:
Without oil filter element
removal:
1.0 L
With oil filter element removal:
1.1 L
Total amount (dry engine):
1.3 L
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