1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 128Get this manual
TIRE INSPECTION
2)Tire pressure below the minimum specification could cause the tire to dislodge from the rim under severe riding conditionsThe following are minimums: Front 27 kPa (0.27 kgcm2, 3.9 psi) Rear 24.5 kPa (0.245 kgcm2, 3.5 psi) 3)Use no more than Front 33 kPa (0.33 kgcm2, 4.7 psi) Rear 30.5 kPa (0.305 kgcm2, 4.3 psi) when seating the tire beadsHigher pressures may cause the tire to burstInflate the tires slowly and carefullyFast inflation could cause the tire to burst
MAXIMUM LOADING LIMIT