Yamaha YZ250FM 2021 Owner's Service Manual

CHASSIS10-4• If the standard figure cannot be achieved byadjusting the adjuster and changing the setlength, replace the spring with an optional oneand make readjustment.EAM30177SETTING OF SPRING AFTERREPLACEMENTAfter replacement, be sure to adjust the spring tothe set length [sunken length 90–100 mm (3.5–3.9 in)] and set it.1. Use of soft spring• Adjust to decrease rebound damping force tocompensate for less spring load. Run with therebound damping force adjuster one or twoclicks turned out, and readjust it to suit yourpreference.2. Use of stiff spring• Adjust to increase rebound damping force tocompensate for greater spring load. Run withthe rebound damping force adjuster one ortwo clicks turned in, and readjust it to suit yourpreference.TIPAdjusting the rebound damping force will be fol-lowed more or less by a change in the compres-sion damping force. For correction, adjust todecrease compression damping force.WARNINGEWA19200When using a rear shock absorber otherthan currently installed, use the one whoseoverall length “a” does not exceed the stan-dard as it may result in faulty performance.Never use one whose overall length is great-er than standard.EAM30178REAR SHOCK ABSORBER SETTING PARTS• Rear shock spring “1”TIP• The I.D. mark “a” is marked at the end of thespring.• Spring specification varies according to thecolor of I.D. marks.• Spring preload adjusting positionsLength “a” of standard shock460.5 mm (18.1 in)1122STD Spring rateN/mm 56TypeSpringrateN/mm Part number I.D.markSOFT 52 BR9-22212-00 Yellow54 BR9-22212-10 Pink56 BR9-22212-20 White58 BR9-22212-30 SilverSTIFF 60 BR9-22212-40 Browna1a