2002 YAMAHA XVS125 engine

5-5
OPERATION AND IMPORTANT RIDING POINTS
5
EAU00460
Parking
Parking
When parking, stop the engine, and
then remove the key from the main
switch.
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.
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6-4
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU03541
NOTE:
8The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
8Hydraulic brake service
9Regularly check and, if necessary, correct the brake fluid level.
9Every two years replace the internal components of the brake master cylinder and caliper, and change the brake
fluid.
9Replace the brake hoses every four years and if cracked or damaged.19
*Shock absorber
assemblies•Check operation and shock absorbers for oil leakage.√√√√
20*Carburetor•Check starter (choke) operation.
•Adjust engine idling speed.√√√√√ √
21 Engine oil•Change.
•Check oil level and vehicle for oil leakage.√√√√√ √
22 Engine oil filter element•Replace.√√√
23*Front and rear brake
switches•Check operation.√√√√√ √
24 Moving parts and cables•Lubricate.√√√√ √
25*Lights, signals and
switches•Check operation.
•Adjust headlight beam.√√√√√ √ NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING (× 1,000 km)
ANNUAL
CHECK
1 6 12 18 24
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6-7
PERIODIC MAINTENANCE AND MINOR REPAIR
6 2. Pull the rear of the panel out with
the key inserted in the lock, and
then slide the panel forward to
release it in the front.To install the panel
1. Secure the front of the panel,
and then push the rear of the
panel in with the key inserted in
the lock.
2. Turn the key counterclockwise to
the original position, remove it,
and then close the lock cover.
EAU03329
Checking the spark plugs
Spark plugs, checking
The spark plugs are important engine
components, which are easy to
check. Since heat and deposits will
cause any spark plug to slowly erode,
the spark plugs should be removed
and checked in accordance with the
periodic maintenance and lubrication
chart. In addition, the condition of the
spark plugs can reveal the condition
of the engine.
To remove a spark plug
1. Remove the spark plug cap.
1
1. Spark plug cap
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6-8
PERIODIC MAINTENANCE AND MINOR REPAIR
62. Remove the spark plug as
shown, with the spark plug
wrench included in the owner’s
tool kit.To check the spark plugs
1. Check that the porcelain insulator
around the center electrode on
each spark plug is a medium-to-
light tan (the ideal color when the
motorcycle is ridden normally).2. Check that all spark plugs
installed in the engine have the
same color.NOTE:
If any 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.3. Check each spark plug for elec-
trode erosion and excessive car-
bon or other deposits, and
replace it if necessary.To install a 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.
1
a
1. Spark plug wrencha. Spark plug gap
Specified spark plug:
CR7HSA (NGK)
U22FSR-U (DENSO)
Spark plug gap:
0.6–0.7 mm
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6-9
PERIODIC MAINTENANCE AND MINOR REPAIR
6
NOTE:
If 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 specified torque as
soon as possible.4. Install the spark plug cap.
EAU04433
Engine oil and oil filter
element
Engine oil and oil filter element
The engine oil level should be
checked before each ride. In addition,
the oil must be changed and the oil
filter element replaced 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.3. Wait a few minutes until the oil
settles, and then check the oil
level through the check window
located at the bottom-right 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 min-
imum level mark, add sufficient
oil of the recommended type to
raise it to the correct level.
2
1
3
1. Oil level check window
2. Maximum level mark
3. Minimum level mark
Tightening torque:
Spark plug:
12.5 Nm (1.25 m0kgf)
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6-10
PERIODIC MAINTENANCE AND MINOR REPAIR
6To change the engine oil (with or
without oil filter element replace-
ment)
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.
NOTE:
Skip steps 4-6 if the oil filter element
is not being replaced.
4. Remove the oil filter element
cover by removing the bolts.
1
1
1
1. Engine oil filler cap 1. Engine oil drain bolt 1. Bolt (×3)
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6-11
PERIODIC MAINTENANCE AND MINOR REPAIR
6 5. Remove and replace the oil filter
element and O-ring.
6. Install the oil filter element cover
by installing the bolts, then tight-
ening them to the specified
torque.
NOTE:
Make sure that the O-ring is properly
seated.
7. Install the engine oil drain bolt,
and then tighten it to the speci-
fied torque.
8. Add the specified amount of the
recommended engine oil, and
then install and tighten the oil
filler cap.
ECA00105
cC8In order to prevent clutch slip-
page (since the engine oil also
lubricates the clutch), do not
mix any chemical additives
with the oil or use oils of grade
“CD” or higher. In addition, do
not use oils labeled “ENERGY
CONSERVING II” or higher.
8Make sure that no foreign
material enters the crankcase.
2
1
1. Oil filter element
2. O-ring
Tightening torque:
Oil filter element cover bolt:
10 Nm (1.0 m0kgf)
Tightening torque:
Engine oil drain bolt:
34 Nm (3.4 m0kgf)
Recommended engine oil:
See page 8-1.
Oil quantity:
With oil filter element
replacement:
1.6 L
Without oil filter element
replacement:
1.4 L
Total amount (dry engine):
1.75 L
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6-12
PERIODIC MAINTENANCE AND MINOR REPAIR
69. Start the engine, and then let it
idle for several minutes while
checking it for oil leakage. If oil is
leaking, immediately turn the
engine off and check for the
cause.
10. Turn the engine off, and then
check the oil level and correct it if
necessary.
EAU03330
Cleaning the air filter
elementThe air filter element should be
cleaned at the intervals specified in
the periodic maintenance and lubrica-
tion chart. Clean the air filter element
more frequently if you are riding in
unusually wet or dusty areas.
1. Remove the air filter case by
removing the bolts and loosening
the clamp screw.2. Remove the air filter case cover
by removing the screws.
1
2
1
1
1. Bolt (×2)
2. Clamp screw1. Screw (×5)
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