Yamaha SR400 2014 Service Manual

PERIODIC MAINTENANCE3-18EAS21390ADJUSTING THE DRIVE CHAIN SLACKNOTICEECA13550A drive chain that is too tight will overloadthe engine and other vital parts, and one thatis too loose can skip and damage the swing-arm or cause an accident. Therefore, keepthe drive chain slack within the specified lim-its.TIPThe drive chain slack must be checked at thetightest point on the chain.1. Stand the vehicle on a level surface.WARNINGEWA13120Securely support the vehicle so that there isno danger of it falling over.TIPPlace the vehicle on a suitable stand so that therear wheel is elevated.2. Move the rear wheel several times and findthe tightest position of drive chain.3. Check:• Drive chain slack “a”Out of specification  Adjust.4. Adjust:• Drive chain slack▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼a. Loosen wheel axle nut “1”.b. Loosen the brake pedal free play adjustingnut and tension bar nut.c. Loosen both locknuts “2”.d. Turn the adjusting bolts “3” in direction “a” or“b” until the specified drive chain slack is ob-tained.TIP• To maintain the proper wheel alignment, adjustboth sides evenly.• Align matching marks “c” with the same posi-tion.e. Tighten the wheel axle nut to specification.f. Tighten the locknuts to specification.g. Tighten the tension bar nut to specification.▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲EAS21440LUBRICATING THE DRIVE CHAINThe drive chain consists of many interactingparts. If the drive chain is not maintained proper-ly, it will wear out quickly. Therefore, the drivechain should be serviced, especially when theDrive chain slack30.0–40.0 mm (1.18–1.57 in)12aDirection “a”Drive chain is tightened.Direction “b”Drive chain is loosened.Wheel axle nut129 Nm (12.9 m·kgf, 93 ft·lbf)Locknut16 Nm (1.6 m·kgf, 12 ft·lbf)Tension bar nut19 Nm (1.9 m·kgf, 14 ft·lbf)123cT R. .T R. .T R..