Page 44 of 410
2-13
WARNING
Always turn off the engine when refueling.
Do not refuel right after the engine has
been running and is still very hot.
Do not spill gasoline on the engine or ex-
haust pipe/muffler when refueling. Never
refuel while smoking, or while in the vicini-
ty of sparks, open flames, or other sources
of ignition such as the pilot lights of water
heaters and clothes dryers. Gasoline can
catch fire and you could be burned.
When transporting the vehicle in another
vehicle, be sure it is kept in an upright po-
sition. Otherwise, fuel may leak out of the
carburetor or fuel tank.
Gasoline is poisonous. If you should swal-
low some gasoline or inhale a lot of gaso-
line vapor, or get some gasoline in your
eyes, see your doctor immediately. If gaso-
line spills on your skin, wash with soap
and water. If gasoline spills on your cloth-
ing, change your clothes.
EE.book Page 13 Monday, July 11, 2005 2:32 PM
Page 138 of 410
5-11
EVU01360
Fuel
Make sure there is sufficient gasoline in the tank.NOTE:_ (for Europe only)
If knocking or pinging occurs, use a different brand
of gasoline or higher octane grade. _
Recommended fuel:
Unleaded gasoline only
For Europe: Regular unleaded gasoline
only with a research octane
number of 91 or higher
Fuel tank capacity:
30.0 L (6.60 Imp gal, 7.93 US gal)
EE.book Page 11 Monday, July 11, 2005 2:32 PM
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5-13
CAUTION:_ Use only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts, such as the valves and piston
rings, as well as to the exhaust system. _
WARNING
Do not overfill the fuel tank. Fuel expands
when it heats up. If the fuel tank is over-
filled, fuel could spill out due to heat from
the engine or the sun.
Be careful not to spill fuel, especially on
the engine or exhaust pipe which can
cause a fire and severe injury. Wipe up any
spilled fuel immediately.
Be sure the fuel tank cap is closed secure-
ly.
EE.book Page 13 Monday, July 11, 2005 2:32 PM
Page 246 of 410

8-7
EVU00671
PERIODIC MAINTENANCE/LUBRICATION
NOTE:
For vehicles not equipped with an odometer or hour meter, follow the month maintenance intervals.
For vehicles equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance intervals.
However, keep in mind that if the vehicle isn’t used for a long period of time, the month maintenance intervals
should be followed.
Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and
technical skills.
ITEM ROUTINEWhichever
comes firstINITIAL EVERY
month136612
km
(mi)320
(200)1,200
(750)2,400
(1,500)2,400
(1,500)4,800
(3,000)
hours 20 75 150 150 300
Valves*Check valve clearance.
Adjust if necessary.
Cooling systemCheck coolant leakage.
Repair if necessary.
Replace coolant every 24 months.Spark plugCheck condition.
Adjust gap and clean.
Replace if necessary.Air filter elements
(engine and air intake duct)Clean.
Replace if necessary.Every 20–40 hours
(More often in wet or dusty areas.)
Carburetor*Check 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.
Tighten if necessary.
Replace gasket(s) if necessary.Fuel line*Check fuel hose for cracks or damage.
Replace if necessary.EE.book Page 7 Monday, July 11, 2005 2:32 PM
Page 390 of 410
10-1
EVU01050
1-SPECIFICATIONS
Model YXR66FAV
Dimensions:
Overall length 2,885 mm (113.6 in)
Overall width 1,385 mm (54.5 in)
Overall height 1,853 mm (73.0 in)
Seat height 818 mm (32.2 in)
Wheelbase 1,910 mm (75.2 in)
Ground clearance 280 mm (11.02 in)
Minimum turning radius 3,900 mm (153.5 in)
Basic weight:
With oil and full fuel tank 506.0 kg (1,116 lb)
For Europe: 519.0 kg (1,144 lb)
Noise and vibration level:
Noise level (77/311/EEC) (for Europe) 81.2 dB(A)
Vibration on seat (EN1032, ISO5008) (for Europe) Will not exceed 0.5 m/s
2
Vibration on steering wheel (EN1032, ISO5008)
(for Europe)Will not exceed 2.5 m/s
2
Engine:
Engine type Liquid cooled 4-stroke, SOHC
Cylinder arrangement Forward-inclined single cylinder
Displacement 660.0 cm
3
Bore
× stroke 100.0
× 84.0 mm (3.94
× 3.31 in)
EE.book Page 1 Monday, July 11, 2005 2:32 PM
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10-3
Quantity:
Without oil filter cartridge replacement 1.90 L (1.67 Imp qt, 2.01 US qt)
With oil filter cartridge replacement 2.00 L (1.76 Imp qt, 2.11 US qt)
Final gear case oil:
Type SAE80 API GL-4 Hypoid gear oil
Quantity 0.25 L (0.22 Imp qt, 0.26 US qt)
Differential gear case oil:
Type SAE80 API GL-4 Hypoid gear oil
Quantity 0.32 L (0.28 Imp qt, 0.34 US qt)
Radiator capacity (including all routes): 2.50 L (2.20 Imp qt, 2.64 US qt)
Air filter:
Engine Wet element
Intake duct Dry element
Fuel:
Type Unleaded gasoline only
For Europe: Regular unleaded gasoline only with a
research octane number of 91 or higher
Fuel tank capacity 30.0 L (6.60 lmp gal, 7.93 US gal)
Carburetor:
Type/quantity BSR42/1
Manufacturer MIKUNIModel YXR66FAV
EE.book Page 3 Monday, July 11, 2005 2:32 PM