Yamaha YZ250 2021 User Manual

TROUBLESHOOTING
7-11
EAM30515
TROUBLESHOOTING OF STEERING/HANDLING
Rear suspension is soft
Oil leaking from rear shock
absorber
Replace the rear shock absorber.
Gas leaking from rear shock
absorber
Replace the rear shock absorber.
Fatigued or damaged rear shock
absorber spring
Replace the rear shock absorber.
Improperly adjusted rear shock
absorber spring preload (soft)
Adjust the spring preload.
Improperly adjusted rear shock
absorber rebound damping (soft)
Adjust the rebound damping.
Improperly adjusted rear shock
absorber compression damping
(soft)
Adjust the compression damping.
Oil leaking from rear shock
absorber
Bent, damaged, or corroded rear
shock absorber rod
Replace the rear shock absorber.
Damaged oil seal lip Replace the rear shock absorber.
Symptom Possible cause Actions
Handlebar wobble
Loose steering ring nut
Tighten the steering ring nut to the
specified torque.
Worn bearing or bearing race
Replace the bearing and bearing
race as a set.
Warped front fork Repair or replace the front fork.
Bent front wheel axle Replace the front wheel axle.
Incorrect tire pressure
Adjust to the specified tire pres-
sure.
Worn, deformed, or incorrect tire Replace the tire.
Heavy steering
Steering ring nut is tightened too
tight.
Tighten the steering ring nut to the
specified torque.
Bent lower bracket Replace the lower bracket.
Broken bearing or bearing race
Replace the bearing and bearing
race as a set.
Incorrect tire pressure
Adjust to the specified tire pres-
sure.
Symptom Possible cause Actions

Yamaha YZ250 2021 Specifications

General

Engine Type	249cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke	66.4mm x 72.0mm
Compression Ratio	8.9~10.6:1
Ignition	CDI
Transmission	5-speed; multiplate wet clutch
Final Drive	Chain
Suspension Rear	KYB® single shock; fully adjustable, 12.4-in travel
Brakes Front	Hydraulic disc, 270mm
Tires Front	80/100-21
Tires Rear	110/90-19
Width	32.5 in
Height	50.8 in
Wheelbase	58.5 in
Ground Clearance	14.2 in
Fuel Capacity	2.1 gal
Wet Weight	227 lb
Fuel Delivery	Keihin PWK38S carburetor
Suspension Front	KYB® Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
Brakes Rear	Hydraulic disc, 245mm