Yamaha YZ125 Owner's Manual

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CHASSIS8-10TIPGenerally a stiff spring gives a stiff riding feeling.Rebound damping tends to become weaker, re-sulting in lack of a sense of contact with the roadsurface or in a vibrating handlebar.EAM30174FRONT FORK SETTING PARTS• Front fork spring “1”TIPThe I.D. mark (slits) “a” is proved on the end ofthe spring.EAM30175REAR SUSPENSION SETTINGThe rear shock absorber setting should be madedepending on the rider’s feeling of an actual runand the circuit conditions.The rear suspension setting includes the follow-ing two factors:1. Setting of spring preload• Change the set length of the spring.• Change the spring.2. Setting of damping force• Change the rebound damping force.• Change the compression damping force.EAM30176CHOOSING SET LENGTH1. Place a stand or a block under the engine toput the rear wheel above the floor, and mea-sure the length “a” between the rear wheelaxle center and the rear fender holding bolt.2. Remove the stand or block from the engineand, with a rider astride the seat, measure thesunken length “b” between the rear wheelaxle center and the rear fender holding bolt.3. Loosen the locknut “1” and make adjustmentby turning the adjuster “2” to achieve thestandard figure from the subtraction of thelength “b” from the length “a”.TIP• If the machine is new and after it is broken in,STD spring rate(N/mm) 4.1TypeSpringrate(N/mm)Part numberI.D.mark(slits)SOFT 3.9 1C3-23141-A1 I4.0 1C3-23141-B1 II4.1 1C3-23141-C1 III4.2 1C3-23141-D1 IIII4.3 1C3-23141-E1 IIIII4.4 1C3-23141-F1 I-I4.5 1C3-23141-G1 I-II4.6 1C3-23141-H1 I-IIISTIFF 4.7 1C3-23141-J1 I-IIIIa1Standard figure90–100 mm (3.5–3.9 in)