1987-1997 Yamaha Big Bear 350 4x4 service manual, Page 44Get this manual
Uneven or improper tire pressure may adversely affect the handling of this machine and may cause loss of control Maintain proper tire pressures Set tire pressures when the tires are cold Tire pressures must be equal in both front tires and equal in both rear tires
2Inspect: Tire surfaces WearDamageReplaceTire Wear LimitFront and Rear: 3.0 mm (O.12 in)