2001 YAMAHA YZ250LC fuel tank removal

CHAPTER 4
ENGINE
SEAT, FUEL TANK AND SIDE
COVERS.....................................................4-1
EXHAUST PIPE AND SILENCER..............4-3
RADIATOR..................................................4-4
CARBURETOR AND REED VALVE...........4-7
CYLINDER HEAD , CYLINDER AND
PISTON.....................................................4-17
CLUTCH AND PRIMARY DRIVEN
GEAR.......................................................4-32
KICK AXLE, SHIFT SHAFT AND
PRIMARY DRIVE GEAR...........................4-39
YPVS GOVERNOR...................................4-48
WATER PUMP..........................................4-50
CDI MAGNETO.........................................4-55
ENGINE REMOVAL..................................4-59
CRANKCASE AND CRANKSHAFT.........4-64
TRANSMISSION, SHIFT CAM AND
SHIFT FORK.............................................4-71
CHAPTER 5
CAHSSIS
FRONT WHEEL AND REAR WHEEL........5-1
FRONT BRAKE AND REAR BRAKE.......5-10
FRONT FORK...........................................5-27
HANDLEBAR............................................5-40
STEERING................................................5-47
SWINGARM..............................................5-52
REAR SHOCK ABSORBER.....................5-59
5MW-9-30-0 7/5/00 2:15 PM Page 20

4-1
SEAT, FUEL TANK AND SIDE COVERSENG
EC400000
ENGINE
EC4R0000
SEAT, FUEL TANK AND SIDE COVERS
Extent of removal Order Part name Q’ty Remarks
SEAT, FUEL TANK AND SIDE
COVERS REMOVAL
Preparation for Turn the fuel cock to “OFF”.
removal Disconnect the fuel hose.
1 Seat 1
2 Air scoop (left and right) 2
3 Fitting band 1 Remove on fuel tank side.
4 Bolt (fuel tank) 2
5 Fuel tank 1
6 Side cover (left) 1
Refer to “REMOVAL POINTS”.
7 Side cover (right) 1
8 Number plate 1
1
4
3
Extent of removal:1Seat removal2Fuel tank removal
3Side covers removal4Number plate removal
2
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4
3 Nm (0.3 m•kg, 2.2 ft•lb)
7 Nm (0.7 m•kg, 5.1 ft•lb)
7 Nm (0.7 m•kg, 5.1 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
7 Nm (0.7 m•kg, 5.1 ft•lb)
3 Nm (0.3 m•kg, 2.2 ft•lb)
3 Nm (0.3 m•kg, 2.2 ft•lb)
7 Nm (0.7 m•kg, 5.1 ft•lb)
7 Nm (0.7 m•kg, 5.1 ft•lb)
5MW-9-30-4A 7/3/00 4:58 PM Page 2

4-2
ENGSEAT, FUEL TANK AND SIDE COVERS
EC4R3000
REMOVAL POINTS
EC413101
Side cover
1. Remove:
9Side cover (left and right) 1
cC
Be sure to remove the seat before remov-
ing the side cover. If you remove the side
cover with force without removing the seat,
the panel 2(on the inside) may contact
the air cleaner case and come off.
5MW-9-30-4A 7/3/00 4:58 PM Page 4

ENG
4-3
EXHAUST PIPE AND SILENCER
EC4S0000
EXHAUST PIPE AND SILENCER
Extent of removal Order Part name Q’ty Remarks
EXHAUST PIPE AND
SILENCER REMOVAL
Preparation for Side cover (right) Refer to “SEAT, FUEL TANK AND
removal SIDE COVERS” section.
1 Bolt (silencer) 2
2 Silencer 1
3 Tension spring 2
4 Bolt (exhaust pipe) 2
5 Exhaust pipe 1
1
Extent of removal:1Silencer removal2Exhaust pipe removal
2
7 Nm (0.7 m•kg, 5.1 ft•lb)
12 Nm (1.2 m•kg, 8.7 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
25 Nm (2.5 m•kg, 18 ft•lb)
12 Nm (1.2 m•kg, 8.7 ft•lb)
12 Nm (1.2 m•kg, 8.7 ft•lb)
5MW-9-30-4A 7/3/00 4:58 PM Page 6

ENG
4-4
RADIATOR
Extent of removal Order Part name Q’ty Remarks
RADIATOR REMOVAL
Preparation for Drain the coolant.
Refer to “COOLANT REPLACEMENT”
removal section in the CHAPTER 3.
Seat and fuel tank Refer to “SEAT, FUEL TANK AND
SIDE COVERS” section.
1 Panel 2 Refer to
“REMOVAL POINTS”.
2 Clamp (radiator hose 2, 3) 2 Only loosening.
3 Radiator hose 1 1
4 Radiator (left) 1
5 Radiator hose 4 1
6 Radiator (right) 1
7 Radiator hose 2 1
8 Radiator hose 3 1
9 Radiator breather hose 1
EC450001
RADIATOR
Extent of removal:1Radiator removal
1
1 Nm (0.1 m•kg, 0.7 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
1 Nm (0.1 m•kg, 0.7 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
5MW-9-30-4A 7/3/00 4:59 PM Page 8

ENG
4-7
CARBURETOR AND REED VALVE
EC460000
CARBURETOR AND REED VALVE
Extent of removal Order Part name Q’ty Remarks
CARBURETOR AND
REED VALVE REMOVAL
Preparation for Fuel tank Refer to “SEAT, FUEL TANK AND
removal SIDE COVERS” section.
1 Solenoid valve lead 1 Disconnect the solenoid valve lead.
2 TPS (throttle position sensor) 1 Disconnect the TPS
lead (throttle position sensor) lead.
3 Clamp (carburetor joint) 2
Loosen the screws (carburetor joint).
4 Carburetor 1
5 Carburetor joint 1
6 Reed valve assembly 1
7 Stopper (reed valve) 2
8 Reed valve 2
1
Extent of removal:1Carburetor removal2Reed valve removal
2
10 Nm (1.0 m•kg, 7.2 ft•lb)
1 Nm (0.1 m•kg, 0.7 ft•lb)
5MW-9-30-4A 7/3/00 5:01 PM Page 14

ENG
4-17
CYLINDER HEAD, CYLINDER AND PISTON
EC470000
CYLINDER HEAD, CYLINDER AND PISTONEC478000
CYLINDER HEAD AND CYLINDER
Extent of removal Order Part name Q’ty Remarks
CYLINDER HEAD AND
CYLINDER REMOVAL
Preparation for Seat and fuel tank Refer to “SEAT, FUEL TANK AND
removal SIDE COVERS” section.
Exhaust pipe and silencer Refer to ”EXHAUST PIPE AND
SILENCER” section.
Radiator hose 1 Disconnect at cylinder head side.
Carburetor Refer to “CARBURETOR AND REED
VALVE” section.
1 Spark plug 1
2 Engine bracket 2
3 Nut (cylinder head) 6
Loosen each nut 1/4 turn, and remove
them after all nuts are loosened.
4 Cylinder head 1
5 Power valve housing 1
6 Push rod 1 Refer to “REMOVAL POINTS”.
7 Nut (cylinder) 4
8 Cylinder 1
Extent of removal:1Cylinder head removal2Cylinder removal
1
2
34 Nm (3.4 m•kg, 24 ft•lb)
69 Nm (6.9 m•kg, 50 ft•lb)
20 Nm (2.0 m•kg, 14 ft•lb)
5 Nm (0.5 m•kg, 3.6 ft•lb)
5 Nm (0.5 m•kg, 3.6 ft•lb)
25 Nm (2.5 m•kg, 18 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
35 Nm (3.5 m•kg, 25 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
5MW-9-30-4A 7/3/00 5:28 PM Page 34

4-55
CDI MAGNETOENG
Extent of removal Order Part name Q’ty Remarks
CDI MAGNETO REMOVAL
Preparation for Seat and fuel tank Refer to “SEAT, FUEL TANK AND
removal SIDE COVERS” section.
Bolt [radiator (left)] Refer to “RADIATOR” section.
Disconnect the CDI magneto lead.
1 Crankcase cover (left) 1
2 Nut (rotor) 1 Use special tool.
3 Rotor 1 Refer to “REMOVAL POINTS”.
4 Stator 1
5 Woodruff key 1
EC4L0000
CDI MAGNETO
1
Extent of removal:1CDI magneto removal
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8 Nm (0.8 m•kg, 5.8 ft•lb)
8 Nm (0.8 m•kg, 5.8 ft•lb)
41 Nm (4.1 m•kg, 30 ft•lb)
5MW-9-30-4C 7/3/00 7:44 PM Page 14