2001 YAMAHA YFM660R cooling

ER
Yuki_DATA2:HM00G210_YFM660R-60:YFM350TOC-E.frame
OPERATION ........................................... 6-1
Starting a cold engine ....................... 6-3
Starting a warm engine ..................... 6-9
Warming up ........................................ 6-9
Reverse knob operation and
reverse driving ............................... 6-11
Shifting ............................................. 6-15
To start out and accelerate .............. 6-17
To decelerate .................................... 6-21
Engine break-in ................................ 6-23
Parking .............................................. 6-27
Parking on a slope ........................... 6-29
Accessories and loading ................. 6-31
Accessories....................................... 6-31
Loading ............................................. 6-33
RIDING YOUR ATV ................................ 7-1
Getting to know your ATV ................. 7-3
Ride with care and good judgement 7-5
Be careful where you ride ............... 7-27
Turning your ATV ............................ 7-39
Climbing uphill ................................. 7-45
Riding downhill ................................ 7-55
Crossing a slope ............................... 7-59
Crossing through shallow water .... 7-63
Riding over rough terrain ................ 7-67
Sliding and skidding ........................ 7-69What to do if... .................................. 7-73
What to do... ..................................... 7-73
PERIODIC MAINTENANCE AND
ADJUSTMENT ....................................... 8-1
Owner’s manual and tool kit ............. 8-3
Periodic maintenance/lubrication ..... 8-7
Panel removal and installation ....... 8-15
Engine oil and oil filter cartridge .... 8-17
Cooling system ................................ 8-31
Changing the coolant ...................... 8-33
Spark plug inspection ...................... 8-41
Air filter element cleaning ............... 8-45
Carburetor adjustment .................... 8-51
Idle speed adjustment ..................... 8-53
Valve clearance adjustment ............ 8-55
Reverse lock release cable
adjustment ..................................... 8-55
Throttle lever adjustment ................ 8-57
Front and rear brake pad
inspection ....................................... 8-59
Brake fluid level inspection ............. 8-61
Brake fluid replacement .................. 8-65
Front brake adjustment ................... 8-67
Rear brake adjustment .................... 8-69
Parking brake adjustment ............... 8-71
Clutch lever free play adjustment .... 8-756
7
8

6-25
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-6.frameEL
1. 0 ~ 10 hours:
Avoid continuous operation above half
throttle. Allow a cooling off period of five
to ten minutes after every hour of opera-
tion. Vary the speed of the machine from
time to time. Do not operate it at one set
throttle position.
2. 10 ~ 20 hours:
Avoid prolonged operation above 3/4
throttle. Rev the machine freely through
the gears but do not use full throttle at any
time.
3. After break-in:
Avoid prolonged full throttle operation.
Vary speeds occasionally.

8-7
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-8.frameEL
EBU00262
PERIODIC MAINTENANCE/LUBRICATION
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year
Valves*• Check valve clearance.
• Adjust if necessary.
Cooling system• Check coolant leakage.
• Repair if necessary.
• Replace coolant every 24 months.
Spark plug• Check condition.
• Adjust gap and clean.
• Replace if necessary.
Air filter element• Clean.
• Replace if necessary.Every 20~40 hours
(More often in wet or dusty areas.)
Carburetor*• Check and adjust idle speed/starter operation.
• Adjust if necessary.
Crankcase breather
system*• Check breather hose for cracks or damage.
• Replace if necessary.
Exhaust system*• Check for leakage.
• Retighten if necessary.
• Replace gasket if necessary.
Fuel line*• Check fuel hose for cracks or damage.
• Replace if necessary.
Engine oil• Replace (Warm engine before draining.)
Engine oil filter cartridge• Replace if necessary.
Drive chain• Check and adjust slack/alignment/clean/lube.
Brakes*• Check operation/fluid leakage/See NOTE Page 8-8.
• Correct if necessary.
Clutch*• Check operation.
• Adjust if necessary.

8-31
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-8.frameEL
EBU00783
Cooling system
1. Check the coolant level in the coolant res-
ervoir when the engine is cold as the cool-
ant level will vary with engine temperature.
The coolant level should be between the
maximum and minimum marks.
2. Remove the coolant reservoir cap, and
then add coolant or distilled water to raise
it to the specified level.
CAUTION:
Hard water or salt water is harmful to the en-
gine. You may use soft water if you can’t get
distilled water.
NOTE:
If water is added, have a Yamaha dealer
check the antifreeze content of the coolant
as soon as possible.
The radiator fan operation is completely au-
tomatic. It is switched on or off according to
the coolant temperature in the radiator.
If your ATV overheats, see page 8-120 for details.Coolant reservoir capacity:
0.29 L
1. Coolant reservoir cap
2. Maximum level mark
3. Minimum level mark
1. Cache du vase d’expansion
2. Repère de niveau maximum
3. Repère de niveau minimum
1. Tapa del depósito de líquido refrigerante
2. Marca de nivel máximo
3. Marca de nivel mínimo

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Yuki_DATA2:HM00G210_YFM660R-60:YFM350-8.frameEL
6. Disconnect the hose on the coolant reser-
voir side, and then drain the coolant from
the coolant reservoir.
7. After draining the coolant, thoroughly
flush the cooling system with clean tap
water.
8. Replace the coolant drain bolt washer if it
is damaged, and then tighten the coolant
drain bolt to the specified torque.
9. Install the coolant reservoir hose.
10. Pour the recommended coolant into the
radiator until it is full. Tightening torque:
Coolant drain bolt:
10 Nm (1.0 m·kg)
1. Hose
1. Flexible
1. Manguera

8-39
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-8.frameEL
CAUTION:
Hard water or salt water is harmful to the en-
gine. You may use soft water if you cannot get
distilled water.
11. Install the radiator cap.
12. Start the engine and let it idle for several
minutes. Stop the engine, and then check
the coolant level in the radiator. If it is low,
add more coolant until it reaches the top
of the radiator.
13. Fill the coolant reservoir with coolant up
to the maximum level.
14. Install the coolant reservoir cap and check
for coolant leakage.
NOTE:
If any leakage is found, have a Yamaha dealer
check the cooling system.
15. Install the panel.

8-120
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-8.frameER
Engine overheating
NOTE:
If it is difficult to get the recommended coolant, tap water can be temporarily used, provided that it
is changed to the recommended coolant as soon as possible.
WARNING
Wait for the engine and radiator to cool before removing the radiator cap. You could be burned by
hot fluid and steam blown out under pressure. Always put a thick rag over the cap when opening.
Allow any remaining pressure to escape before completely removing the cap.
Wait until the
engine has cooled.Check the coolant level in the
reservoir tank and/or radiator.
Level is OK.
Level is low, check the
cooling system for leakage.
No
leakage.
Leakage.Ask a Yamaha dealer to inspect
and repair the cooling system.
Add coolant. (See NOTE.)
Restart the engine. If the engine overheats again, ask a
Yamaha dealer to inspect and/or repair the cooling system.