2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 39Get this manual
GENERAL SPECIFICATIONS Item Tire pressure (cold tire): Maximum load Off-road riding
Standard 220 kg (485 lb) 3238 kPa (0.320.38 kgcm2, 4.65.5 psi) 2733 kPa (0.270.33 kgcm2, 3.94.8 psi)