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Yamaha yz250f 2012 Service Manual

Yamaha yz250f 2012
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5-10
FRONT BRAKE AND REAR BRAKE
HANDLING NOTE
Support the machine securely so
there is no danger of it falling over.
DRAINING THE BRAKE FLUID
1. Remove:
Brake master cylinder cap "1"
Protector (rear brake)
Do not remove the diaphragm.
A. Front
B. Rear
2. Connect the transparent hose "2"
to the bleed screw "1" and place a
suitable container under its end.
A. Front
B. Rear
3. Loosen the bleed screw and drain
the brake fluid while pulling the le-
ver in or pushing down on the
pedal.
Do not reuse the drained brake
fluid.
Brake fluid may erode painted
surfaces or plastic parts. Always
clean up spilled fluid immediate-
ly.
REMOVING THE BRAKE CALIPER
PISTON
1. Remove:
Brake caliper piston
Use compressed air and proceed
carefully.
Cover piston with rag and use ex-
treme caution when expelling
piston from cylinder.
Never attempt to pry out piston.
Caliper piston removal steps:
a. Insert a piece of rag into the brake
caliper to lock one brake caliper.
b. Carefully force the piston out of
the brake caliper cylinder with
compressed air.
A. Front
B. Rear
REMOVING THE BRAKE CALIPER
PISTON SEAL KIT
1. Remove:
Brake caliper piston dust seal "1"
Brake caliper piston seal "2"
Remove the brake caliper piston
seals and brake caliper piston dust
seals by pushing them with a finger.
Never attempt to pry out brake cal-
iper piston seals and brake caliper
piston dust seals.
Replace the brake caliper piston
seals and brake caliper piston dust
seals whenever a caliper is disas-
sembled.
A. Front
B. Rear
CHECKING THE BRAKE MASTER
CYLINDER
1. Inspect:
Brake master cylinder inner sur-
face "a"
Wear/scratches Replace mas-
ter cylinder assembly.
Stains Clean.
Use only new brake fluid.
A. Front
B. Rear
2. Inspect:
Diaphragm "1"
Crack/damage Replace.
A. Front
B. Rear

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Yamaha yz250f 2012 Specifications

General IconGeneral
Engine TypeLiquid-cooled, 4-stroke, DOHC, 4-valve
Displacement250cc
Bore x Stroke77.0mm x 53.6mm
Compression Ratio13.5:1
Final DriveChain
Front Tire80/100-21
Rear Tire100/90-19
Fuel Capacity1.6 gallons
Width32.5 in
IgnitionTCI
Transmission5-speed
Front SuspensionTelescopic fork, 11.8 inches travel
Rear Suspension12.4 inches travel
Front BrakeSingle disc, 250mm
Rear BrakeHydraulic single disc, 245mm
Wet Weight231 lbs
Height51.2 in

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