2002-2006 Yamaha YFR450FAR Service Manual LIT-11616-16-01, Page 224Get this manual
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THERMOSTAT
CHECKING THE THERMOSTAT 1.Check: Thermostat Does not open at 63.566.5 (146.3151.7 F) Replace Checking steps: Suspend the thermostat in container filled with waterG Slowly heat the wat