YAMAHA XV125S 2000 Service Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
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EAU03053Spark plugsRemoval
1. Remove the spark plug caps.
1. Spark plug cap
1
2. Use the spark plug wrench in
the tool kit to remove the spark
plugs as shown.
1. Spark plug wrench
Inspection
The spark plug is an important engine
component and is easy to inspect.
The condition of the spark plug can
indicate the condition of the engine.
Normally, all spark plugs from the
same engine should have the same
color on the white insulator around
the center electrode. The ideal color
at this point is a medium-to-light tan
color for a motorcycle that is being
ridden normally. If one spark plug
shows a distinctly different color,
there could be something wrong with
the engine.
Do not attempt to diagnose such
problems yourself. Instead, take the
motorcycle to a Yamaha dealer. You
should periodically remove and
inspect the spark plugs because heat
and deposits will cause any spark
plug to slowly break down and erode.
If electrode erosion becomes exces-
sive, or if carbon and other deposits
are excessive, you should replace the
spark plug with the specified plug.
Specified spark plug:
CR6HSA (NGK) or
U20FSR-U (DENSO)
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EAU01523Engine oil
Oil level inspection
1. Place the motorcycle on a level
place and hold it in an upright
position. Warm up the engine
for several minutes.
NOTE:
Be sure the motorcycle is posi-
tioned straight up when checking
the oil level. A slight tilt toward the
side can result in false readings.
1. Oil level window
2. Maximum level mark
3. Minimum level mark
a
Installation
1. Measure the electrode gap
with a wire thickness gauge
and, if necessary, adjust the
gap to specification.
2. Clean the gasket surface. Wipe
off any grime from the
threads.
3. Install the spark plug and tight-
en it to the specified torque.
a. Spark plug gap
NOTE:
If a torque wrench is not available
when you are installing a spark
plug, a good estimate of the cor-
rect torque is 1/4 to 1/2 turn past
finger tight. Have the spark plug
tightened to the specified torque as
soon as possible.
4. Install the spark plug caps.
Spark plug gap:
0.6 ~ 0.7 mm
Tightening torque:
Spark plug:
12.5 Nm (1.25 m0kg)
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2. With the engine stopped,
check the oil level through the
level window located at the
lower part of the right side
crankcase cover.
NOTE:
Wait a few minutes until the oil
level settles before checking.
3. The oil level should be
between maximum level and
minimum level marks. If the
level is low, fill engine with
sufficient oil to raise it to the
specified level.
1
Engine oil and oil filter element
replacement
1. Warm up the engine for a few
minutes.
2. Stop the engine. Place an oil
pan under the engine and
remove the oil filler cap.
1. Oil filler cap
3. Remove the drain plug and
drain the oil.
1. Engine oil drain plug
1
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97. Install the new oil filter, new O-
ring and the oil filter cover.
Tighten the oil filter cover
bolts to the specified torque.
NOTE:
Make sure the O-ring is seated
properly.
8. Fill the engine with oil. Install
the oil filler cap and tighten it. Tightening torque:
Oil filter cover bolt:
10 Nm (1.0 m·kg)
PERIODIC MAINTENANCE AND MINOR REPAIR
4. Remove the oil filter cover
bolts and the oil filter cover.
1. Oil filter cover bolt (´3)
5. Remove the oil filter and O-
ring.
6. Reinstall the drain plug and
tighten it to the specified
torque.
1. Oil filter
2. O-ring
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Tightening torque:
Drain plug:
32 Nm (3.2 m·kg)
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PERIODIC MAINTENANCE AND MINOR REPAIR
EC000066
cC
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.
9. 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.
10. Stop the engine and check the
oil level. Recommended oil:
See page 8-1.
Oil quantity:
Total amount:
1.7 L
Periodic oil change:
1.4 L
With oil filter replacement:
1.6 L
EAU01174*Air filter
The air filter should be cleaned at
the specified intervals. It should be
cleaned more frequently if you are
riding in unusually wet or dusty
areas.
1. Bolt
2. Air filter cover
3. Air filter case
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93. Remove the screws and the air
filter cover.
1. Screw (´2)
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PERIODIC MAINTENANCE AND MINOR REPAIR
1. Remove the bolts and the air
filter case.
1. Bolt (´2)
2. Remove the hoses from the air
filter case.
1. Hose (´2)
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PERIODIC MAINTENANCE AND MINOR REPAIR
4. Remove the wing nut and the
air filter.
1. Wing nut
2. Air filter
5. Remove the foam element
from its frame and clean it
with solvent. After cleaning,
remove the remaining solvent
by squeezing it.
6. Apply recommended oil to the
entire surface of the element
and squeeze out the excess oil.
It should be wet but not drip-
ping.
1. Foam element
2. Frame
121
2
Recommended oil:
Engine oil
7. Pull the element over its
frame, install the air filter in
the case and tighten the wing
nut.
8. Install the air filter cover.
9. Connect the hoses and install
the air filter case.
EC000082
cC
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.
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92. 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
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a
b
Standard idle speed:
1,300 ~ 1,400 r/min
PERIODIC MAINTENANCE AND MINOR REPAIR
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.
EC000094
cC
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.
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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.
12ab
c
Free play:
3 ~ 5 mmEAU00637Valve 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.
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EW000083
w
Proper loading of your motorcycle
is important for several character-
istics of your motorcycle, such as
handling, braking, performance
and safety. Do not carry loosely
packed items that can shift.
Securely pack your heaviest items
close to the center of the motorcy-
cle, and distribute the weight
evenly from side to side. Properly
adjust the suspension for your
load, and check the condition and
pressure of your tires. NEVER
OVERLOAD YOUR MOTORCYCLE.
Make sure the total weight of the
cargo, rider, passenger, and acces-
sories (fairing, saddlebags, etc. if
approved for this model) does not
exceed the maximum load of the
motorcycle. Operation of an over-
loaded motorcycle could cause tire
damage, an accident, or even
injury.
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU00647Tires
To ensure maximum performance,
long service, and safe operation,
note the following:
Tire air pressure
Always check and adjust the tire
pressure before operating the
motorcycle.
EW000082
w
Tire inflation pressure should be
checked and adjusted when the
temperature of the tire equals the
ambient air temperature. Tire infla-
tion pressure must be adjusted
according to total weight of cargo,
rider, passenger, and accessories
(fairing, saddlebags, etc. if
approved for this model), and vehi-
cle speed.
* Load is the total weight of cargo, rider, passen-
ger, and accessories.
Maximum load* 183 kg
Cold tire pressure Front Rear
175 kPa 200 kPa
Up to 90 kg (1.75 kg/cm
2, (2.0 kg/cm2,1.75 bar) 2.00 bar)
90 kg load ~200 kPa 225 kPa
Maximum load*(2.0 kg/cm
2, (2.25 kg/cm2,
2.00 bar) 2.25 bar)
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