2001 Yamaha YFM660 Raptor Factory Service Manual, Page 266Get this manual

THERMOSTAT

CHECKING THE THERMOSTAT 1.Check: Thermostat Does not open at 6973 (156.2163.4 F) Replace

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives