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Yamaha WR250F 2022 User Manual

Yamaha WR250F 2022
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REAR BRAKE
4-33
4. Check:
Brake fluid level
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-23.
5. Check:
Brake pedal operation
A softy or spongy feeling Bleed the brake
system.
Refer to “BLEEDING THE HYDRAULIC
BRAKE SYSTEM” on page 3-25.
EAM30042
REMOVING THE REAR BRAKE CALIPER
TIP
Before disassembling the brake caliper, drain
the brake fluid from the entire brake system.
1. Remove:
Union bolt
Copper washer
Brake hose
TIP
Put the end of the brake hose into a container
and pump out the brake fluid.
EAM30043
DISASSEMBLING THE REAR BRAKE
CALIPER
1. Remove:
Brake caliper piston “1”
Brake caliper piston seal kit “2”
a. Blow compressed air into the brake hose
joint opening to force out the piston from
the brake caliper.
WARNING
EWA13550
Cover the brake caliper piston with a rag.
Be careful not to get injured when the pis-
ton is expelled from the brake caliper.
Never try to pry out the brake caliper pis-
ton.
b. Remove the brake caliper piston dust seal
and the brake caliper piston seal.
EAM30044
CHECKING THE REAR BRAKE CALIPER
1. Check:
Brake caliper piston “1”
Rust/scratches/wear Replace the brake
caliper piston.
Brake caliper cylinder “2”
Scratches/wear Replace the brake caliper
assembly.
Brake caliper body “3”
Cracks/damage Replace the brake caliper
assembly.
Brake fluid delivery passages
(brake caliper body)
Obstruction Blow out with compressed air.
WARNING
EWA19270
When the brake caliper is disassembled, re-
place the brake caliper piston seal and the
brake caliper piston dust seal with new ones.
2. Check:
Brake caliper bracket
Crack/damage Replace.
EAM30045
ASSEMBLING THE REAR BRAKE CALIPER
WARNING
EWA19280
Before installation, clean and lubricate the
internal parts. Use new brake fluid for
1
2
1
2
3

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Yamaha WR250F 2022 Specifications

General IconGeneral
Bore x Stroke77.0mm x 53.6mm
Compression Ratio13.8:1
IgnitionTCI: Transistor Controlled Ignition
Final DriveChain
Suspension RearKYB® single shock; fully adjustable, 12.5-in travel
Length85.6 in
Width32.5 in
Height50.0 in
Seat Height38.2 in
Wheelbase58.3 in
Rake (Caster Angle)27.2°
Trail4.6 in
Fuel Capacity2.2 gal
Wet Weight254 lb
Engine TypeLiquid-cooled, DOHC, 4-stroke
Fuel DeliveryFuel injection
Suspension FrontKYB® Speed-Sensitive System inverted fork; fully adjustable
Brakes FrontHydraulic single disc
Brakes RearHydraulic single disc brake
Tires Front80/100-21
Tires Rear110/100-18

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