2005 YAMAHA YZ250LC bolt pattern

4-31
CYLINDER HEAD, CYLINDER AND PISTONENG
4. Install:
9Push rod 1
9Bolt (push rod) 2
NOTE:
9Insert the set pin 3included in owner’s tool kit
to install the bolt (push rod).
9Do not forget to remove the set pin.
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Be sure to use the set pin. If the set pin is
not used, the power valve constituent parts
will result in damage.
5. Install:
9Gasket (power valve housing)
9Power valve housing 1
9Bolt (power valve housing) 2
6. Install:
9O-ring 1
9Dowel pin 2
NOTE:
Apply the lithium soap base grease on the O-
rings.
7. Install:
9Cylinder head 1
9Copper washer 2
9Nut (cylinder head) 3
NOTE:
Tighten the nuts (cylinder head) in stage, using a
crisscross pattern.
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)
1P8-9-30-4B 11/5/04 10:59 AM Page 8

4-39
CLUTCH AND PRIMARY DRIVEN GEARENG
10. Install:
9O-ring 1
To clucth cover.
11. Install:
9Clutch cover 1
9Bolt (clutch cover) 2
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
12. Install:
9O-ring 1
9Clutch cable 2
NOTE:
Apply the lithium soap base grease on the O-
ring.
10 Nm (1.0 m•kg, 7.2 ft•lb)
1P8-9-30-4B 11/5/04 10:59 AM Page 24

4-48
KICK AXLE, SHIFT SHAFT AND PRIMARY DRIVE GEARENG
8. Install:
9Shift pedal 1
9Bolt (shift pedal) 2
NOTE:
Install the shift pedal so that the top of the shift
pedal outer diameter ais highest without
exceeding the line bconnecting the center of
the shift shaft and bottom of the screw
[crankcase cover (left)] 3.
7. Install:
9Kick starter 1
9Plain washer 2
9Bolt (kick starter) 3
NOTE:
Install the kick starter closest to but not contact-
ing the clutch cover mounting boss a.
6. Install:
9Bolt [crankcase cover (right)] 1
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
30 Nm (3.0 m•kg, 22 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
1P8-9-30-4B 11/5/04 10:59 AM Page 42

4-71
CRANKCASE AND CRANKSHAFTENG
8. Tighten:
9Segment 1
9Bolt (segment) 2
NOTE:
9When installing the segment onto the shift cam
3, align the punch mark awith the dowel pin
b.
9Turn the segment clockwise until it stops and
tighten the bolt.
30 Nm (3.0 m•kg, 22 ft•lb)
7. Install:
9Tension spring 1
9Holder 2
9Bolt (holder) 3
NOTE:
Install the holder so that it contacts the projec-
tion aon the crankcase (right).
10 Nm (1.0 m•kg, 7.2 ft•lb)
9. Remove:
9Sealant
Forced out on the cylinder mating surface.
10. Apply:
9Engine oil
To the crank pin, bearing, oil delivery hole
and connecting rod big end washer.
11. Check:
9Crankshaft and transmission operation
Unsmooth operation
Repair.
14 Nm (1.4 m•kg, 10 ft•lb)
6. Install:
9Bolt (crankcase) 1
NOTE:
Tighten the crankcase tightening bolts in stage,
using a crisscross pattern.
1P8-9-30-4C 21/5/04 1:00 PM Page 44

5-5
CHASFRONT WHEEL AND REAR WHEEL
EC595000
ASSEMBLY AND INSTALLATION
EC595101
Front wheel
1. Install:
9Bearing (left) 1
9Spacer 2
9Bearing (right) 3
9Oil seal 4
NOTE:
9Apply the lithium soap base grease on the
bearing and oil seal lip when installing.
9Use a socket that matches the outside diam-
eter of the race of the bearing.
9Left side of bearing shall be installed first.
9Install the oil seal with its manufacture’s
marks or numbers facing outward.
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Do not strike the inner race of the bearing.
Contact should be made only with the out-
er race.
2. Install:
9Brake disc 1
9Bolt (brake disc) 2
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
3. Install:
9Collar 1
NOTE:
9Apply the lithium soap base grease on the oil
seal lip.
9Install the collars with their projections afacing
the wheel.
4. Install:
9Wheel
NOTE:
Install the brake disc 1between the brake pads
2correctly.
12 Nm (1.2 m•kg, 8.7 ft•lb)
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5-7
CHASFRONT WHEEL AND REAR WHEEL
NOTE:
9Apply the lithium soap base grease on the
bearing and oil seal lip when installing.
9Install the bearing with seal facing outward.
9Use a socket that matches the outside diam-
eter of the race of the bearing.
9Right side of bearing shall be installed first.
9Install the oil seal with its manufacture’s
marks or numbers facing outward.
cC
Do not strike the inner race of the bearing.
Contact should be made only with the out-
er race.
2. Install:
9Brake disc 1
9Bolt (brake disc) 2
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
EC5251A1
Rear wheel
1. Install:
9Bearing (right) 1
9Circlip 2
9Spacer 3
9Bearing (left) 4
9Oil seal 5
14 Nm (1.4 m•kg, 10 ft•lb)
1P8-9-30-5A 19/5/04 9:28 AM Page 14