2001 YAMAHA YFM660R air filter

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

7-65
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-7.frameEL
Test your brakes after leaving the water. Do
not continue to ride your ATV without verifying
that you have regained proper braking ability.
CAUTION:
After riding your ATV in water, be sure to
drain the trapped water by removing the
check hose at the bottom of the air filter case.
Wash the ATV in fresh water if it has been op-
erated in salt water or muddy conditions.
1. Check hose
1. Flexible de contrôle
1. Manguito de retención

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.

8-45
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-8.frameEL
1. Check hose
1. Flexible de contrôle
1. Manguito de comprobación
1. Air filter case cover 2. Holder (× 6)
1. Couvercle du boîtier de filtre à air 2. Support (× 6)
1. Tapa de la caja del filtro 2. Soporte (× 6)
EBU00818
Air filter element cleaning
NOTE:
There is a check hose at the bottom of the air
filter case. If dust or water collects in this hose,
empty the hose and clean the air filter element
and air filter case.
1. Remove the seat. (See page 8-15 for seat
removal procedure.)
2. Remove the air filter case cover by un-
hooking the holders.
3. Remove the air filter element and remove
it from its frame.
4. Wash the element gently but thoroughly
in solvent.
WARNING
Always use parts cleaning solvent to clean the
air filter element. Never use low flash point sol-
vents or gasoline to clean the air filter element
because the engine could catch fire or explode.

8-47
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-8.frameEL
1. Unlock
1. Déverrouiller
1. Levántelo
1. Guide 2. Air filter element
3. Element plate
1. Guide 2. Élément du filtre à air
3. Plaquette de retenue d’élément
1. Guía 2. Elemento filtrante
3. Element plate
5. Squeeze the excess solvent out of the fil-
ter element and let it dry.
CAUTION:
Do not twist the filter element when squeez-
ing it.
6. Inspect the element and replace it if dam-
aged.
7. Apply foam air filter oil to the element. If
foam air filter oil is not available, motor oil
may be used.
NOTE:
The element should be wet but not dripping.
8. Pull the element over its frame.
9. Install the element assembly.
10. Install the air filter case cover and be sure
to connect the hose.

8-49
Yuki_DATA2:HM00G210_YFM660R-60:YFM350-8.frameEL
NOTE:
The air filter element should be cleaned every
20 ~ 40 hours. It should be cleaned and lubri-
cated more often if the machine is operated in
extremely dusty areas. Each time the filter ele-
ment maintenance is performed, check the air
inlet to the filter case for obstructions. Check
the air cleaner rubber joint to the carburetor
and manifold fittings for an airtight seal. Tight-
en all fittings securely to avoid the possibility
of unfiltered air entering the engine.
CAUTION:
Never operate the engine with the air filter el-
ement removed. This will allow unfiltered air
to enter, causing rapid engine wear and possi-
ble engine damage. Additionally, operation
without the filter element will affect carbure-
tor jetting with subsequent poor performance
and possible engine overheating.
1. Hose
1. Flexible
1. Manguera

Yuki_DATA2:HM00G210_YFM660R-60:YFM350-SPEC-E.frameEL
10-3
Radiator capacity (including all routes): 1.3 L
Air filter: Wet type element
Fuel:
Type
Tank capacity
Reserve amountRegular unleaded gasoline
12 L
2.6 L
Carburetor:
Type
× quantity
ManufacturerBSR33
× 2
MIKUNI
Spark plug:
Type/manufacturer
GapDPR8EA-9/NGK
0.8 ~ 0.9 mm
Clutch:
Type
OperationWet, Multiple-disc
Left hand operation
Transmission:
Primary Reduction System
Primary Reduction Ratio
Secondary Reduction System
Secondary Reduction Ratio
Transmission type
OperationSpur gear
71/34 (2.088)
Chain drive
40/13 (3.076)
Constant mesh, 5-speed forward, 1-speed reverse
Left foot operation MODEL YFM660R