2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 169Get this manual
COOLING SYSTEM
SYSTEM TESTING
COOLANT (HYDROMETER TEST)
Remove the right front fender ('04'05: page 3-6, After '05: page 3-6)Remove the radiator cap
Test the coolant gravity using hydrometer(See "coolant gravity chart" below For maximum corrosion protection, 5050 solution of ethylene glycol and distilled water is recommended (page 9-6)Look for contamination and replace the coolant if necessary
COOLANT GRAVITY CHART (32) 1.009 1.018 1.028 1.036 1.045 1.053 1.063 1.072 1.080 1.086 1.095 1.100 (41) 1.009 1.017 1.027 1.035 1.044 1.052 1.062 1.070 1.078 1.084 1.093 1.098 10 (50) 1.008 1.017 1.026 1.034 1.043 1.051 1.060 1.068 1.076 1.082 1.091 1.095 Coolant temperature F) 15 20 25 30 35 (59) (68) (77) (86) (95) 1.008 1.007 1.006 1.005 1.003 1.016 1.015 1.014 1.013 1.011 1.025 1.024 1.022 1.020 1.018 1.033 1.031 1.029 1.027 1.025 1.042 1.040 1.038 1.036 1.034 1.047 1.046 1.045 1.043 1.041 1.058 1.056 1.054 1.052 1.049 1.066 1.064 1.062 1.059 1.056 1.074 1.072 1.069 1.066 1.063 1.080 1.077 1.074 1.071 1.068 1.088 1.085 1.082 1.079 1.076 1.092 1.089 1.086 1.083 1.080 40 (104) 1.001 1.009 1.016 1.023 1.031 1.038 1.046 1.053 1.060 1.065 1.073 1.07750 (113) (122) 0.999 0.997 1.007 1.005 1.014 1.012 1.021 1.019 1.028 1.025 1.035 1.032 1.043 1.040 1.050 1.047 1.057 1.054 1.062 1.059 1.070 1.067 1.074 1.071