How to Flush & Change Coolant in a Yamaha Grizzly YFM 700 

Did you know that the coolant in your Yamaha Grizzly turns acidic over time? 

If you don't periodically change the coolant on your Grizzly, it starts corroding the internal parts within your engine, not to mention the radiator and coolant hoses. Yamaha recommends replacing the coolant on your Grizzly YFM700 at least once every two years. Watch the video above or print out the walkthrough below for reference while you work on your Yamaha Grizzly coolant flush.

Tools and Parts Needed - Yamaha Grizzly Coolant Flush

Tools 

Parts

Draining the Yamaha Grizzly YFM700 Cooling System

Step 1. Remove the left footwell and the left side cover.

Step 2. Remove the front carrier and the front cover beneath it to access and remove the radiator cap.  

Step 3. Have a drain pan ready and remove the drain bolt at the base of the water pump housing, which is located just below the left crankcase cover. Drain the cooling system completely. 

PRO TIP: The pressure of the coolant can make it squirt out at first, so make sure to position the drain pan accordingly.

Yamaha Grizzly coolant drain

Step 4. Inspect the old coolant. If it is stained by rust or has contaminants, it will be necessary to flush the cooling system before adding new coolant. If the old coolant is in relatively good condition, skip ahead to the last section (Replacing Yamaha Grizzly YFM700 Coolant) of this guide.

Yamaha YFM700 coolant drain

Flushing the Yamaha Grizzly YFM700 Cooling System

NOTE: Only use coolant flush that's compatible with aluminum radiators when servicing your Grizzly. Always follow the instructions on the coolant flush you're using, which vary from product to product. 

Here's how to do a typical coolant flush on a Yamaha Grizzly YFM700:

Step 1. Locate the coolant reservoir behind the left front fender, disconnect the hose from the base of the coolant reservoir, and fully drain the reservoir. Reconnect the reservoir hose.

Yamaha Grizzly ATV cooling system reservoir

Step 2. Fill the cooling system with water, and then drain it out to remove as much debris and any remaining coolant as possible.

NOTE: Add fluid to the radiator and continue filling until the radiator is full. Don't fill the cooling system through the reservoir.

Step 3. Fill the cooling system with the instructed concentration of coolant flush and replace the radiator cap.

Step 4. Remove the right side cover and the ducting beneath it to access the thermostat.

Step 5. Loosen the thermostat bleed bolt to remove any air from the system, then tighten the bleed bolt.

Yamaha YFM 700 Grizzly coolant flush

Step 6. Loosen the water pump bleed bolt to remove any air from the system, then tighten the bleed bolt. The bleed bolt is located above the drain bolt on the water pump housing.

Yamaha Grizzly water pump bleed bolt

Step 7. Run the engine until it reaches normal operating temperature, then shut it off and let it cool.

Step 8. Drain the cooling system to remove the coolant flush.

Step 9. Refill the cooling system with water, then replace the radiator cap and run the motor up to operating temperature.

Step 10. Let the motor cool, and then drain the cooling system again to rinse away any last traces of coolant flush.

Step 11. Inspect the water that drains from the cooling system. The water should be more or less clear and free of contaminants. If the water is still heavily discolored or contains debris, you'll need to repeat Step 4 through Step 11.

Yamaha Grizzly ATV coolant flush water drain

Replacing Yamaha Grizzly YFM700 Coolant

Step 1. Fill the cooling system with Yamacool engine coolant.

YFM700 engine coolant change

Step 2. Loosen the water pump bleed bolt to remove any air from the system.

Yamaha ATV Grizzly coolant flush

Step 3. Loosen the thermostat bleed bolt to remove any air from the system.

Thermostat bleed bolt Yamaha Grizzly

Step 4. Run the motor for a few seconds, then top off the cooling system with engine coolant and replace the radiator cap.

Step 5. Run the motor until it reaches normal operating temperature, then shut it off and let it cool.

Step 6. Top off the cooling system with engine coolant and replace the radiator cap.

Step 7. Refill the reservoir with engine coolant to somewhere between the Low and Full markings.

Yamaha YFM 700 Grizzly coolant change

Step 8. Reinstall the ducting and right side cover.

Step 9. Reinstall the front carrier and the front cover.

Step 10. Reinstall the left side cover and the left footwell and you're done.

Yamaha ATV coolant flush stages

Remember, if you don't want to have to go through the additional hassle of flushing your YFM700's cooling system, make sure you change the coolant at least every two years. And if you want your ATV to provide you thrills and excitement for many years to come, you need to change the oil on it regularly. Watch the video below to learn how to change the oil in a Yamaha Grizzly.

 

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