engine YAMAHA YZ250LC 2007 Owner's Guide

2-15
CABLE ROUTING DIAGRAMSPEC
1Ignition coil lead
2Clamp
3CDI magneto lead
4Neutral switch lead (except for
USA and CDN)
5Radiator breather hose
6Connector cover
AClamp the ignition coil lead to
the frame at its locating tape.
Clamp it in front of the radiator
fitting boss.
BClamp the CDI magneto lead tothe frame at its locating tape.
Clamp it at the rear of the radia-
tor fitting boss.
CDo not allow the neutral switch
lead to slacken except over the
radiator hose. (except for USA
and CDN)
DPass the neutral switch lead
through the holder. (except for
USA and CDN)
EPass the radiator breather hose
outside the engine bracket and
inside the down tube. Then
pass the radiator breather hose
inside the CDI magneto lead.
FClamp the CDI magneto lead,
radiator breather hose, YPVS
breather hose and neutral
switch lead (except for USA and
CDN) to the frame.GClamp the radiator breather
hose, CDI magneto lead and
neutral switch lead (except for
USA and CDN) to the frame.
HPass the CDI magneto lead,
radiator breather hose and neu-
tral switch lead (except for USA
and CDN) in front of the radiator
hose. Then pass the radiator
breather hose inside the CDI
magneto lead and neutral
switch lead (except for USA and
CDN).
IPass the radiator breather hose
and ignition coil lead between
the frame and the radiator (left).
JLocate the clamp ends in the
arrowed range.
KBring the connector cover into
contact with the coupler.
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2-16
CABLE ROUTING DIAGRAMSPEC
1Clamp
2Wireharness
3High tension cord
4CDI unit band
5CDI unit
6CDI unit lead
7Connector cover
8Radiator hose
9Radiator breather hose
0CDI unit stayAClamp the wireharness to the
right engine bracket.
BPass the high tension cord to
the right of the radiator hose so
that the high tension cord does
not contact the radiator hose.
CPass the CDI unit lead between
the frame and the radiator
(right) and then above the radia-
tor fitting boss.
DBring the connector cover into
contact with the coupler.
EPass the radiator breather hose
behind the radiator hose.
FInsert the CDI unit band until it
stops at the CDI unit stay.
1P8-9-32-2 4/29/06 11:46 AM Page 58

SPEC
2-18
CABLE ROUTING DIAGRAM
1Brake hose
2Master cylinder
3“ENGINE STOP” button lead
4“ENGINE STOP” button
5Throttle cable
6Clutch cable
7Clamp
8Cable guideAInstall the brake hose so that its pipe portion directs
as shown and lightly touches the projection on the
master cylinder.
BPass the “ENGINE STOP” button lead in the middle
of the clutch holder.
CClamp the “ENGINE STOP” button lead to the han-
dlebar.
DPass the brake hose in front of the number plate
and through the cable guide.
EPass the clutch cable through the cable guide on
the number plate.
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SPEC
2-18
SCHEMA DE CHEMINEMENT DES CABLES
KABELFÜHRUNGSÜBERSICHTPLAN
DIAGRAMMA DEL PASSAGGIO DEI CAVI
1Bremsschlauch
2Hauptbremszylinder
3Leitungskabel des Motorstoppknopfes
„ENGINE STOP“
4Motorstoppknopf „ENGINE STOP“
5Gasseil
6Kupplungskabel
7Klemme
8Kabelführung
ADen Bremsschlauch so einbauen, dass
sein Rohrteil gemäß Abbildung ange-
ordnet ist und den Überstand am
Hauptbremszylinder leicht berührt.
BDas Leitungskabel des Motorstopp-
knopfes „ENGINE STOP“ in der Mitte
des Kupplungshalters durchführen.
CKabel des Motorausschaltknopfes am
Lenker festklemmen.
DDen Bremsschlauch vor dem Num-
mernschild und durch die Kabelführung
durchführen.
EDen Kupplungszug durch die Seilzug-
führung am Nummernschild hindurch-
führen. 1Tuyau de frein2Maître-cylindre3Fil de bouton d’arrêt du moteur “ENGI-
NE STOP”
4Bouton d’arrêt du moteur “ENGINE
STOP”
5Câble d’accélérateur6Câble d’embrayage7Bride8Guide de câble
åIstaller la tuyau de frein de manière que
la partie avec le tuyau soit dirigée
comme indipué et touche légèrement la
saillie sur le maîtrecylindre.
∫Faire passer le fil de bouton d’arrêt du
moteur “ENGINE STOP” au centre du
support d’embrayage.
çFixer le fil du bouton “ENGINE STOP”
sur le guidon.
∂Faire passer le tuyau de frein devant la
plaque d’immatriculation et à travers le
guide de câble.
´Faire passer le câble d’embrayage au tra-
vers du guide de câble sur la plaque
d’immatriculation.
1Tubo flessibile del freno2Cilindro principale3Conduttore del pulsante “ARRESTO
MOTORE”
4Pulsante “ARRESTO MOTORE”5Cavo dell’acceleratore6Cavo della frizione7Nastro8Guida per cavi
åInstallare il tubo flessibile del freno in
modo che la sua parte di tubo sia rivolta
come illustrato e tocchi leggermente la
sporgenza sul cilindro principale.
∫Far passare il conduttore del pulsante
“ARRESTO MOTORE” nel mezzo del
supporto della frizione.
çBloccare il conduttore del pulsante
“ARRESTO MOTORE” sul manubrio.
∂Far passare il tubo flessibile del freno
davanti alla targa e attraverso la guida
per cavi.
´Passare il cavo frizione attraverso la
guida per cavi sulla targa.
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3-4
PRE-OPERATION INSPECTION AND MAINTENANCE
INSP
ADJ
EC320000
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating
condition.
Before using this machine, check the following points.
EC321000
GENERAL INSPECTION AND MAINTENANCE
Item Routine Page
Coolant Check that coolant is filled up to the radiator filler cap.
Check the cooling system for leakage.P3-5~9
Fuel Check that a fresh mixture of oil and gasoline is filled in
the fuel tank. Check the fuel line for leakage.P1-12
Transmission oil Check that the oil level is correct. Check the crankcase
for leakage.P3-12~14
Gear shifter and clutch Check that gears can be shifted correctly in order and
that the clutch operates smoothly.P3-9
Throttle grip/Housing Check that the throttle grip operation and free play
are correctly adjusted. Lubricate the throttle grip and P3-10~11
housing, if necessary.
Brakes Check the play of front brake and effect of front and
rear brake.P3-17~23
Chain Check chain slack and alignment. Check that the chain
is lubricated properly.P3-24~26
Wheels Check for excessive wear and tire pressure. Check for
loose spokes and have no excessive play.P3-34~35
Steering Check that the handlebar can be turned smoothly and
have no excessive play.P3-35~37
Front forks and Check that they operate smoothly and there is no oil
rear shock absorber leakage.P3-26~33
Cables (wires) Check that the clutch and throttle cables move smooth-
ly. Check that they are not caught when the handlebars —
are turned or when the front forks travel up and down.
Muffler Check that the muffler is tightly mounted and has no
cracks.P3-15~16
Sprocket Check that the driven sprocket tightening bolt is
not loose.P3-24
Lubrication Check for smooth operation. Lubricate if necessary. P3-38
Bolts and nuts Check the chassis and engine for loose bolts and nuts. P1-16
Lead connectors Check that the CDI magneto, CDI unit, and ignition coil
are connected tightly.P1-6
Settings Is the machine set suitably for the condition of the
racing course and weather or by taking into account the
P7-1~22
results of test runs before racing? Are inspection and
maintenance completely done?
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INSP
ADJ
3-5
ENGINE/COOLANT LEVEL INSPECTION/
COOLANT REPLACEMENT
EC350000
ENGINE
EC351011
COOLANT LEVEL INSPECTION
w
Do not remove the radiator cap 1 1
, drain
bolt and hoses when the engine and radia-
tor are hot. Scalding hot fluid and steam
may be blown out under pressure, which
could cause serious injury.
When the engine has cooled, place a thick
towel over the radiator cap, slowly rotate
the cap counterclockwise to the detent.
This procedure allows any residual pres-
sure to escape. When the hissing sound
has stopped, press down on the cap while
turning counterclockwise and remove it.
cC
Hard water or salt water is harmful to the
engine parts. You may use distilled water,
if you can’t get soft water.
1. Place the machine on a level place, and
hold it in an upright position.
2. Remove:
9Radiator cap
3. Check:
9Coolant level a
Coolant level lowAdd coolant.
1Radiator
EC353011
COOLANT REPLACEMENT
w
Do not remove the radiator cap when the
engine is hot.
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INSP
ADJ
3-6
COOLANT REPLACEMENT
cC
Take care so that coolant does not splash
on painted surfaces. If it splashes, wash it
away with water.
1. Place a container under the engine.
2. Remove:
9Coolant drain bolt 1
3. Remove:
9Radiator cap
Drain the coolant completely.
4. Clean:
9Cooling system
Thoroughly flush the cooling system with
clean tap water.
5. Install:
9Copper washer
9Coolant drain bolt
6. Fill:
9Radiator
9Engine
To specified level.
Recommended coolant:
High quality ethylene glycol
anti-freeze containing
anti-corrosion for
aluminum engine
Coolant 1and water
(soft water) 2mixing ratio:
50%/50%
Coolant capacity:
1.20 L (1.06 Imp qt, 1.27 US qt)
10 Nm (1.0 m•kg, 7.2 ft•lb)
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INSP
ADJ
3-7
RADIATOR CAP INSPECTION
cC
9Do not mix more than one type of ethyl-
ene glycol antifreeze containing corro-
sion inhibitors for aluminum engine.
9Do not use water containing impurities
or oil.
7. Install:
9Radiator cap
Start the engine and warm it up for a sev-
eral minutes.
8. Check:
9Coolant level
Coolant level lowAdd coolant.
EC355000
RADIATOR CAP INSPECTION
1. Inspect:
9Seal (radiator cap) 1
9Valve and valve seat 2
Crack/DamageReplace.
Exist fur deposits 3Clean or replace.
Handling notes of coolant:
The coolant is harmful so it should be handled
with special care.
w
9When coolant splashes to your eye.
Thoroughly wash your eye with water
and see your doctor.
9When coolant splashes to your clothes.
Quickly wash it away with water and then
with soap.
9When coolant is swallowed.
Quickly make him vomit and take him to
a doctor.
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INSP
ADJ
3-10
THROTTLE CABLE ADJUSTMENT/
THROTTLE LUBRICATION
EC35A001
THROTTLE CABLE ADJUSTMENT
1. Check:
9Throttle grip free play a
Out of specificationAdjust.
2. Adjust:
9Throttle grip free play
EC35S002
THROTTLE LUBRICATION
1. Remove:
9Cap cover 1
9Throttle cable cap 2
2. Apply:
9Lithium soap base grease
On the throttle cable end a, tube guide
cable winding portion band roller sliding
surface c.
Throttle grip free play adjustment steps:
9Loosen the locknut 1.
9Turn the adjuster 2until the specified free
play is obtained.
9Tighten the locknut.
NOTE:
Before adjusting the throttle cable free play,
the engine idle speed should be adjusted.
w
After adjusting, turn the handlebar to
right and left and make sure that the
engine idling does not run faster.
Throttle grip free play ?a:
3~5 mm (0.12~0.20 in)
Locknut:
7 Nm (0.7 m•kg, 5.1 ft•lb)
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INSP
ADJ
3-11
AIR FILTER CLEANING
3. Install:
9Throttle cable cap
9Cap cover
EC35G041
AIR FILTER CLEANING
NOTE:
Proper air filter maintenance is the biggest key
to preventing premature engine wear and dam-
age.
cC
Never run the engine without the air filter
element in place; this would allow dirt and
dust to enter the engine and cause rapid
wear and possible engine damage.
1. Remove:
9Seat
9Fitting bolt 1
9Washer 2
9Air filter element 3
9Filter guide 4
2. Clean:
9Air filter element
Clean them with solvent.
NOTE:
After cleaning, remove the remaining solvent by
squeezing the element.
cC
Do not twist the element when squeezing
the element.
1 Nm (0.1 m•kg, 0.7 ft•lb)
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