2016 YAMAHA YFM90 tire size

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2
technique described in this manual on level
ground. Avoid crossing the side of a steep hill if
possible.
 Always use proper procedures if you stall or roll
backwards when climbing a hill. To avoid stall-
ing, use the proper gear and maintain a steady
speed when climbing a hill. If you stall or roll
backwards, follow the special procedure for
braking described in this manual. Dismount on
the uphill side or to a side if pointed straight up-
hill. Turn the ATV around and remount, following
the procedure described in this manual.
 Always check for obstacles before operating in
a new area.
 Never attempt to operate over large obstacles,
such as large rocks or fallen trees. Always follow
proper procedures when operating over obsta-
cles as described in this manual.
 Always be careful when skidding or sliding.
Learn to safely control skidding or sliding by
practicing at low speeds and on level, smooth
terrain. On extremely slippery surfaces, such as
ice, go slowly and be very cautious in order to
reduce the chance of skidding or sliding out of
control. 
Never operate an ATV in fast flowing water or in
water deeper than that recommended in this
manual. Remember that wet brakes may have
reduced stopping ability. Test your brakes after
leaving water. If necessary, apply them several
times to let friction dry out the linings.
 Always use the size and type of tires specified in
this manual.
 Always maintain proper tire pressure as de-
scribed in this manual.
 Never exceed the stated load capacity for an
ATV. Cargo should be properly distributed and
securely attached. Reduce speed and follow in-
structions in this manual for carrying cargo or
pulling a trailer. Allow greater distance for brak-
ing.
 Do not operate your ATV during darkness un-
less it is equipped with a properly functioning
headlight. Off-road riding is inherently danger-
ous and additionally, off-road trails do not have
streetlights to guide you.
 Never maintain an ATV without proper knowl-
edge. Contact an authorized ATV dealer to in-
form you on basic ATV maintenance. Certain
maintenance can only be carried out by certified
staff.
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Aftermarket tires and rims
The tires and rims that came with your ATV were
designed to match the performance capabilities
and to provide the best combination of handling,
braking, and comfort. Other tires, rims, sizes, and
combinations may not be appropriate.
EBU19841Chassis fastenersMake sure that all nuts, bolts and screws are
properly tightened.EBU33810Instruments and switchesCheck that all instruments and switches are work-
ing properly. Correct if necessary.
Front:
Manufacturer/model:MAXXIS/M939
DURO/DI2017
Size: AT18 x 7-8
Ty p e : Tu b e l e s s
Rear: Manufacturer/model:MAXXIS/M940
DURO/DI2016
Size: AT18 x 9-8
Ty p e : Tu b e l e s s
UBD360E0.book Page 6 Wednesd ay, February 25, 2015 2:41 PM

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Transmission oil:Type:SAE 80W-90
Quantity:
0.35 L (0.37 US qt, 0.31 Imp.qt)Air filter:Air filter element:Wet elementFuel:Recommended fuel:Regular unleaded gasoline only
Fuel tank capacity: 6.6 L (1.74 US gal, 1.45 Imp.gal)
Fuel reserve amount:
0.9 L (0.24 US gal, 0.20 Imp.gal)Carburetor:Type × quantity:
H66D x 1Spark plug (s):Manufacturer/model: NGK/CR6HSA
Spark plug gap: 0.6–0.7 mm (0.024–0.028 in)Clutch:Clutch type:Dry, centrifugal automaticTransmission:Secondary reduction system:
Chain drive
Secondary reduction ratio: 35/14 (2.500) Transmission type:
V-belt automatic
Operation: Centrifugal automatic type
Chassis:Frame type:Steel tube frame
Caster angle: 3.4 °
Trail:
19.8 mm (0.78 in)Front tire:Type:Tubeless
Size:
AT18 x 7-8
Manufacturer/model: MAXXIS/M939
Manufacturer/model: DURO/DI2017Rear tire:Type:Tubeless
Size: AT18 x 9-8
Manufacturer/model:
MAXXIS/M940
Manufacturer/model: DURO/DI2016
UBD360E0.book Page 2 Wednesd ay, February 25, 2015 2:41 PM

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Loading:Maximum loading limit:82.0 kg (181 lb)
(Total weight of rider, cargo, accessories, and tongue)Tire air pressure (measured on cold tires):Recommended:
Front:24.0 kPa (0.240 kgf/cm², 3.5 psi)
Rear:
24.0 kPa (0.240 kgf/cm², 3.5 psi)
Minimum: Front:
20.7 kPa (0.207 kgf/cm², 3.0 psi)
Rear: 20.7 kPa (0.207 kgf/cm², 3.0 psi)Front wheel:Wheel type:
Panel wheel
Rim size: 8 x 5.5ATRear wheel:Wheel type:
Panel wheel
Rim size: 8 x 5.5ATFront brake:Type:
Mechanical leading, trailing drum brake
Operation: Right hand operation
Rear brake:Type:Mechanical leading, trailing drum brake
Operation:
Left hand operationFront suspension:Type:Swing axle
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel: 126 mm (5.0 in)Rear suspension:Type:
Swingarm
Spring/shock absorber type: Coil spring/oil damper
Wheel travel: 145 mm (5.7 in)Electrical system:Ignition system:CDI
Charging system: AC magnetoBattery:Model:GTX5L-BS
Voltage, capacity: 12 V, 4.0 Ah
UBD360E0.book Page 3 Wednesd ay, February 25, 2015 2:41 PM