Engine - Yamaha 2011 YZ250FA Owner's Service Manual

To tighten → Turn the adjuster "3" counter-
clockwise.
To loosen → Turn the adjuster "3" clock-
wise and push wheel forward.
c. Turn each adjuster exactly the same amount
to maintain correct axle alignment. (There
are marks "a" on each side of the drive chain
puller alignment.) NOTICE: Improper drive
chain slack will overload the engine as-
well as other vital parts of the motorcycle
and can lead to chain slippage or break-
age. To prevent this from occurring, keep
the drive chain slack within the specified
limits.
A. Right
B. Left
Turn the adjuster so that the drive chain is in
line with the sprocket, as viewed from the rear.
d. Tighten the axle nut while pushing down the
drive chain.
Axle nut:
135 Nm (13.5 m•kg, 98 ft•lb)
e. Tighten the locknuts.
Locknut:
21 Nm (2.1 m•kg, 15 ft•lb)
CHECKING THE FRONT FORK
1. Inspect:
• Front fork smooth action
Operate the front brake and stroke the front
fork.
Unsmooth action/oil leakage → Repair or re-
place.
CHECKING THE FRONT FORK
PROTECTOR GUIDE
1. Inspect:
• Protector guide "1"
Out of specification → Replace.
The protector guide reaches the limit of its use
when it is worn down to the same height "a" as
of the outer tube circumference.
CLEANING THE FRONT FORK OIL SEAL
AND DUST SEAL
1. Remove:
• Protector
• Dust seal "1"
Use a thin screw driver, and be careful not to
damage the inner fork tube and dust seal.
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CHASSIS