2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 218Get this manual
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RADIATOR EBS00127
3 Measure: radiator cap opening pressure Below the specified pressure Replace the radiator capRadiator cap opening pressure 107.9137.3 kPa (1.0791.373 kgcm2, 15.3519.53 psi) aI