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Yamaha yz250 2015 User Manual

Yamaha yz250 2015
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5-34
SWINGARM
HANDLING NOTE
Support the machine securely so
there is no danger of it falling over.
REMOVING THE CAP
1. Remove:
• Left cap "1"
Remove with a slotted-head screw-
driver inserted under the mark "a" on
the left cap.
REMOVING THE BEARING
1. Remove:
• Bearing "1"
Remove the bearing by pressing its
outer race.
CHECKING THE SWINGARM
1. Inspect:
• Bearing "1"
• Bushing "2"
Free play exists/unsmooth revolu-
tion/rust → Replace bearing and
bushing as a set.
2. Inspect:
• Oil seal "3"
Damage → Replace.
CHECKING THE RELAY ARM
1. Inspect:
• Bearing "1"
•Collar "2"
Free play exists/unsmooth revolu-
tion/rust → Replace bearing and
collar as a set.
2. Inspect:
• Oil seal "3"
Damage → Replace.
CHECKING THE CONNECTING
ROD
1. Inspect:
•Bearing "1"
• Collar "2"
Free play exists/unsmooth revolu-
tion/rust → Replace bearing and
collar as a set.
2. Inspect:
• Oil seal "3"
Damage → Replace.
INSTALLING THE BEARING AND
OIL SEAL
1. Install:
•Bearing "1"
• Oil seal "2"
To swingarm.
• Apply the molybdenum disulfide
grease on the bearing when install-
ing.
• Install the bearing by pressing it on
the side having the manufacture's
marks or numbers.
• First install the outer and then the
inner bearings to a specified depth
from inside.
2. Install:
• Bearing "1"
• Washer "2"
• Oil seal "3"
To relay arm.
• Apply the molybdenum disulfide
grease on the bearing when install-
ing.
• Install the bearing by pressing it on
the side having the manufacture's
marks or numbers.
• Apply the molybdenum disulfide
grease on the washer.
3. Install:
• Bearing "1"
• Oil seal "2"
To connecting rod.
• Apply the molybdenum disulfide
grease on the bearing when install-
ing.
• Install the bearing by pressing it on
the side having the manufacture's
marks or numbers.
Installed depth of bear-
ings:
Outer "a": 0 mm (0 in)
Inner "b": 6.5 mm (0.26
in)
Installed depth of bear-
ings "a":
0 mm (0 in)
Installed depth of bear-
ing "a":
0 mm (0 in)

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Yamaha yz250 2015 Specifications

General IconGeneral
Displacement249cc
Bore x Stroke66.4mm x 72.0mm
Compression Ratio8.9~10.6:1
IgnitionCDI
Transmission5-speed; multiplate wet clutch
Final DriveChain
Front Tire80/100-21
Rear Tire110/90-19
Wheelbase58.3 in
Seat Height39.1 in
Ground Clearance14.2 in
Fuel Capacity2.1 gal
Wet Weight227 lbs
Engine Type2-stroke
Fuel SystemKeihin PWK38S
Front SuspensionKYB Speed-Sensitive System inverted fork; fully adjustable
Rear Suspension12.4-in travel
Front BrakeSingle disc, 250mm
Rear BrakeHydraulic single disc brake, 245mm
Width32.5 inches

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