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Yamaha yz250 2015 User Manual

Yamaha yz250 2015
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4-6
RADIATOR
HANDLING NOTE
Do not remove the radiator cap
when the engine and radiator are
hot. Scalding hot fluid and steam
may be blown out under pressure,
which could cause serious injury.
When the engine has cooled, open
the radiator cap by the following
procedure:
Place a thick rag, like a towel, over
the radiator cap, slowly rotate the
cap counterclockwise to the de-
tent. This procedure allows any re-
sidual pressure to escape. When
the hissing sound has stopped,
press down on the cap while turn-
ing counterclockwise and remove
it.
CHECKING THE RADIATOR
1. Inspect:
Radiator core "1"
Obstruction Blow out with com-
pressed air through rear of the ra-
diator.
Bent fin Repair/replace.
INSTALLING THE RADIATOR
1. Install:
Radiator breather hose "1"
Radiator hose 2 "2"
To right radiator "3".
2. Install:
Right radiator "1"
Washer "2"
Bolt (right radiator) "3"
Radiator hose 4 "4"
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
3. Install:
Left radiator "1"
Washer "2"
Bolt (left radiator) "3"
Radiator hose 1 "4"
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
4. Tighten:
Radiator hose clamp 2 "5"
5. Install:
Radiator guard "1"
Bolt (radiator guard) "2"
Fit the hook "a" on the inner side first
into the radiator.
Radiator hose 2:
2 Nm (0.2 m•kg, 1.4
ft•lb)
Bolt (right radiator):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Radiator hose 4:
2 Nm (0.2 m•kg, 1.4
ft•lb)
Bolt (left radiator):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Radiator hose 1:
2 Nm (0.2 m•kg, 1.4
ft•lb)
Radiator hose clamp 2:
2 Nm (0.2 m•kg, 1.4
ft•lb)
Bolt (radiator guard):
10 Nm (1.0 m•kg, 7.2
ft•lb)

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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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