Yamaha YZ250FM 2021 Owner's Service Manual

CHASSIS3-30wheel off the ground.WARNINGEWA13120Securely support the vehicle so that there isno danger of it falling over.2. Remove the bleed screw “1” and release theinternal pressure from the front fork.3. Tighten:• Bleed screwEAM30482CHECKING THE REAR SHOCK ABSORBERASSEMBLY1. Stand the vehicle upright on a level surface.WARNINGEWA13120Securely support the vehicle so that there isno danger of it falling over.2. Check:• Rear shock absorber assemblyGas leaks/oil leaks  Replace the rear shockabsorber assembly.Refer to “REAR SHOCK ABSORBER AS-SEMBLY” on page 4-58.3. Check:• Rear shock absorber assembly smooth ac-tion• Rear suspension link smooth actionSit astride the seat and shake your body upand down several times to check whether therear shock absorber assembly operatessmoothly.Unsmooth operation  Correct or replace.Refer to “REAR SHOCK ABSORBER AS-SEMBLY” on page 4-58.EAM30242ADJUSTING THE REAR SHOCK ABSORBERASSEMBLYUse a maintenance stand to raise the rear wheeloff the ground.WARNINGEWA13120Securely support the vehicle so that there isno danger of it falling over.Spring preloadNOTICEECA24360Do not turn the adjuster forcibly beyond itsadjusting range.1. Adjust:• Spring preloada. Loosen the locknut “1”.b. Loosen the adjuster “2” until there is someclearance between the spring and the ad-juster.c. Measure the spring free length “a”.d. Turn the adjuster in the direction of “b” or“c” to make an adjustment.TIP• Be sure to remove all dirt and mud from aroundthe locknut and adjusting ring before adjust-Bleed screw1.3 N·m (0.13 kgf·m, 0.95 lb·ft)T R..1Direction “b”Spring preload is increased (suspen-sion is harder).Direction “c”Spring preload is decreased (suspen-sion is softer).Spring preload adjusting positionsMinimumPosition in which the spring isturned in 1.5 mm (0.06 in) fromits free length.StandardPosition in which the spring isturned in 7.0 mm (0.28 in) fromits free length.MaximumPosition in which the spring isturned in 18.0 mm (0.71 in) fromits free length.1122a