Yamaha YZ125 Owner's Manual

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CHASSIS3-17Adjusting the drive chain slackWARNINGEWA13120Securely support the vehicle so that there isno danger of it falling over.1. Adjust:• Drive chain slacka. Loosen the wheel axle nut “1”.b. Loosen both locknuts “2”.c. Turn the adjusting bolt “3” until the speci-fied drive chain slack is obtained.TIP• To maintain the proper wheel alignment, adjustboth sides evenly.• Push the rear wheel forward to make sure thatthere is no clearance between the swingarmend plates and the ends of the swingarm.d. Tighten the wheel axle nut.e. Tighten the drive chain puller locknut.EAM30247CHECKING AND ADJUSTING THESTEERING HEAD1. Use a maintenance stand to raise the frontwheel off the ground.WARNINGEWA13120Securely support the vehicle so that there isno danger of it falling over.2. Check:• Steering headGrasp the bottom of the front fork legs andgently rock the front fork.Blinding/looseness  Adjust the steeringhead.3. Remove:• Handlebar• Upper bracket4. Adjust:• Steering heada. Remove the washer “1”.b. After loosening the ring nut “2” with asteering nut wrench “3”, tighten it to thespecified torque.TIP• Set the torque wrench at a right angle to thesteering nut wrench.• Move the steering to the left and right a coupleof times to check that it moves smoothly.c. Turn the front fork to the right and left a fewtimes, and make sure that the steering ro-tates smoothly. If it does not turn smooth-ly, remove the lower bracket and checkthe upper and lower bearings.Drive chain slack (Maintenancestand)48.0–58.0 mm (1.89–2.28 in)Rear wheel axle nut125 N·m (12.5 kgf·m, 92 lb·ft)Drive chain puller locknut19 N·m (1.9 kgf·m, 14 lb·ft)21 3T R..T R..Steering nut wrench90890-01403Exhaust flange nut wrenchYU-A9472Steering ring nut (initial tighten-ing torque)38 N·m (3.8 kgf·m, 28 lb·ft)132T R..