2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 122Get this manual
CHECKING THE TIRES
1Measure: tire pressure Out of specification AdjustNOTE: The low-pressure tire gauge is included as standard equipment If dust or the like is stuck to this gauge, it will not provide the correct readingsTherefore, take two measurements of the tire's pressure and use the second readingCold tire pressure Standard
30 kPa 35 kPa (0.30 kgcm2, (0.35 kgcm2, 4.4 psi) 5.0 psi) 32 kPa 27 kPa (0.27 kgcm2, (0.32 kgcm2, 3.9 psi) 4.5 psi) 38 kPa 33 kPa 2, (0.38 kgcm2, (0.33 kgcm 4.7 psi) 5.4 psi)