2007 YAMAHA YZ250LC diagram

4-6
ENGRADIATOR
EC455000
ASSEMBLY AND INSTALLATION
EC445354
Radiator
1. Install:
9Radiator breather hose 1
9Radiator hose 2 2
To radiator (right) 3.
2. Install:
9Radiator (right) 1
9Plain washer 2
9Bolt [radiator (right)] 3
9Radiator hose 4 4
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
10 Nm (1.0 m•kg, 7.2 ft•lb)
2 Nm (0.2 m•kg, 1.4 ft•lb)
2 Nm (0.2 m•kg, 1.4 ft•lb)
3. Install:
9Radiator (left) 1
9Plain washer 2
9Bolt [radiator (left)] 3
9Radiator hose 1 4
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
4. Tighten:
9Clamp (radiator hose 2) 5
5. Install:
9Panel 1
9Bolt (panel) 2
NOTE:
Fit the hook aon the inner side first into the
radiator.
10 Nm (1.0 m•kg, 7.2 ft•lb)
2 Nm (0.2 m•kg, 1.4 ft•lb)
2 Nm (0.2 m•kg, 1.4 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
1P8-9-32-4a 4/10/06 1:53 PM Page 12

4-15
ENGCARBURETOR AND REED VALVE
8. Install:
9Air vent hose [
/=580 mm (22.8 in)] 1
9Air vent hose [/=400mm (15.7 in)] 2
9Overflow hose [/=280mm (11.0 in)] 3
9Clamp 4
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
NOTE:
Install the air vent hoses and overflow hose to
the carburetor with their ends not having the cuts
atoward the carburetor.
9. Install:
9Jet needle 1
9Collar 2
9Spring 3
9Needle holder 4
To throttle valve 5.
NOTE:
Install the spring with its smaller dia. afacing
the collar.
7. Install:
9Float chamber 1
9Plate 2
9Screw (float chamber) 3
1P8-9-32-4a 4/10/06 1:53 PM Page 30

4-17
ENGCARBURETOR AND REED VALVE
2. Tighten:
9Screw (carburetor joint) 1
3. Tighten:
9Screw (air cleaner joint) 1
NOTE:
Place the screw head awith its top as shown
and secure the clamp in alignment with the hori-
zontal line bthat passes the center of the car-
buretor bore.
4. Connect:
9TPS (throttle position sensor) lead 1
9Solenoid valve lead 2
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
5. Adjust:
9Idle speed
Refer to “IDLE SPEED ADJUSTMENT”
section in the CHAPTER 3.
1P8-9-32-4a 4/10/06 1:53 PM Page 34

4-59
CDI MAGNETOENG
7. Connect:
9CDI magneto lead 1
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
8. Install:
9Gasket [crankcase cover (left)]
9Crankcase cover (left) 1
9Screw [crankcase cover (left)] 2
NOTE:
Tighten the screws in stage, using a crisscross
pattern.
5 Nm (0.5 m•kg, 3.6 ft•lb)
1P8-9-32-4c 5/1/06 10:46 AM Page 20

4-64
ENGINE REMOVALENG
4. Install:
9Chain guide 1
9Chain cover 2
9Screw (chain cover) 3 2. Install:
9Lock washer 1
9Nut (drive sprocket) 2
NOTE:
Tighten the nut while applying the rear brake.
3. Bend the lock washer tab to lock the nut.
5 Nm (0.5 m•kg, 3.6 ft•lb)
75 Nm (7.5 m•kg, 54 ft•lb)
EC4M5341
Drive sprocket
1. Install:
9Drive sprocket 1
9Drive chain 2
NOTE:
Install the drive sprocket together with the drive
chain.
5. Connect: (except for USA and CDN)
9Neutral switch lead
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
1P8-9-32-4c 5/1/06 10:46 AM Page 30

EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000
ELECTRICAL COMPONENTS
1CDI unit
2“ENGINE STOP” button
3Ignition coil
4TPS (throttle position sensor)
5Solenoid valve
6Neutral switch (Except for USA and CDN)
7CDI magneto
8Spark plug
EC612000
WIRING DIAGRAM
6-1
ELECTRICAL COMPONENTS AND WIRING DIAGRAMELEC
COLOR CODE
B...................Black
L ...................Blue
O ..................Orange
R ..................Red
Sb.................Sky blue
Y...................YellowB/L................Black/Blue
B/R ...............Black/Red
B/W ..............Black/White
G/L ..............Green/Blue
G/W ..............Green/White
W/L...............White/Blue
W/R ..............White/Red
*1:Except for USA and CDN
1P8-9-32-6 4/6/06 3:00 PM Page 2