Yamaha YZ125 Owner's Manual

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FRONT FORK4-155. Remove:• Base valve “1”(from the damper assembly)TIPHold the damper assembly with the cap bolt ringwrench “2” and use the cap bolt wrench “3” to re-move the base valve.EAM30057CHECKING THE FRONT FORK LEGS1. Check:• Inner tube surfaceScratches  Repair or replace.Use #1000 grit wet sandpaper.Damaged oil lock piece  Replace.• Inner tube bendsOut of specification  Replace.Use the dial gauge.TIPThe bending value is shown by one half of thedial gauge reading.WARNINGEWA13650Do not attempt to straighten a bent innertube as this may dangerously weaken it.2. Check:• Outer tubeScratches/wear/damage  Replace.3. Measure:• Fork spring free length “a”Out of specification  Replace.4. Check:• Damper assembly “1”Bend/damage  Replace.• O-ring “2”Wear/damage  Replace.NOTICEECA14200• The front fork leg has a built-in damper ad-justing rod and a very sophisticated inter-nal construction, which are particularlysensitive to foreign material.• When disassembling and assembling thefront fork leg, do not allow any foreign ma-terial to enter the front fork.5. Check:• Base valve “1”Wear/damage  Replace.Cap bolt wrench90890-01500Cap bolt wrenchYM-01500Cap bolt ring wrench90890-01501Cap bolt ring wrenchYM-01501Inner tube bending limit0.2 mm (0.01 in)123Fork spring free length limit449.0 mm (17.68 in)G08892121