Removing The Drive Sprocket; Installing The Engine; Installing The Drive Sprocket; Installing The Brake Pedal - Yamaha YZ250 Owner's Service Manual

HANDLING NOTE
Support the machine securely so
there is no danger of it falling over.
REMOVING THE DRIVE
SPROCKET
1. Remove:
• Nut (drive sprocket) "1"
• Lock washer "2"
• Straighten the lock washer tab.
• Loosen the nut while applying the
rear brake.
2. Remove:
• Drive sprocket "1"
• Drive chain "2"
Remove the drive sprocket together
with the drive chain.
REMOVING THE ENGINE
Make sure that the couplers, hoses
and cables are disconnected.
1. Lift the engine "1" up to the point
where the engine's mounting front
does not contact the bracket on
the frame.
2. Remove the engine "1" aslant and
upward while inclining it toward
the kick crank side so that the en-
gine's mounting top does not con-
tact the bracket on the frame.

INSTALLING THE ENGINE

1. Install:
• Engine "1"
Install the engine from right side.
• Pivot shaft "2"
Pivot shaft:
85 Nm (8.5 m•kg, 61
ft•lb)
• Engine mounting bolt (lower) "3"
Engine mounting bolt
(lower):
64Nm (6.4 m•kg, 46
ft•lb)
• Engine mounting bolt (front) "4"
Engine mounting bolt
(front):
64 Nm (6.4 m•kg, 46
ft•lb)
• Engine bracket "5"
• Bolt (engine bracket) "6"
Bolt (engine bracket):
34 Nm (3.4 m•kg, 24
ft•lb)
• Engine mounting bolt (upper) "7"
Engine mounting bolt
(upper):
64 Nm (6.4 m•kg, 46
ft•lb)
Apply the molybdenum disulfide
grease on the pivot shaft.

INSTALLING THE BRAKE PEDAL

1. Install:
4-39
ENGINE REMOVAL
• Spring "1"
• Brake pedal "2"
• O-ring "3"
• Bolt (brake pedal) "4"
Bolt (brake pedal):
26 Nm (2.6 m•kg, 19
ft•lb)
• Clip "5"
Apply the lithium soap base grease
on the bolt, O-rings and brake pedal
bracket.
INSTALLING THE DRIVE
SPROCKET
1. Install:
• Drive sprocket "1"
• Drive chain "2"
Install the drive sprocket together
with the drive chain.
2. Install:
• Lock washer "1"
• Nut (drive sprocket) "2"
Nut (drive sprocket):
75 Nm (7.5 m•kg, 54
ft•lb)
Tighten the nut while applying the
rear brake.
3. Bend the lock washer tab to lock
the nut.