2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 169Get this manual

2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 169

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COOLING SYSTEM
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 (