2017 YAMAHA YFM90 ABS

EBU17421
TABLE OF CONTENTS
LOCATION OF THE WARNING AND
SPECIFICATION LABELS .............................. 1-1
SAFETY INFORMATION ................................ 2-1
DESCRIPTION................................................ 3-1Left view ...................................................... 3-1
Right view.................................................... 3-1
Controls and instruments............................ 3-2
INSTRUMENT AND CONTROL
FUNCTIONS ................................................... 4-1 Main switch ................................................. 4-1
Indicator lights............................................. 4-1
Handlebar switches .................................... 4-2
Throttle lever ............................................... 4-2
Speed limiter ............................................... 4-3
Front brake lever ......................................... 4-4
Rear brake lever .......................................... 4-5
Parking brake .............................................. 4-5
Drive select lever ......................................... 4-6
Kickstarter ................................................... 4-7
Fuel tank cap .............................................. 4-8
Fuel ............................................................. 4-8 Fuel cock .................................................. 4-10
Starter (choke) ......................................... 4-11
Seat .......................................................... 4-12
Adjusting the front shock absorber
assemblies .............................................. 4-13
Adjusting the rear shock absorber assembly ................................................ 4-14
PRE-OPERATION CHECKS .......................... 5-1 Fuel ............................................................. 5-3
Engine oil .................................................... 5-3
Transmission oil .......................................... 5-3
Front and rear brakes ................................. 5-3
Throttle lever ............................................... 5-3
Drive chain .................................................. 5-3
Tires ............................................................ 5-3
Chassis fasteners ....................................... 5-6
Instruments and switches........................... 5-6
OPERATION .................................................. 6-1 Starting a cold engine................................. 6-1
Starting a warm engine............................... 6-3
Operating the drive select lever and driving in reverse ...................................... 6-3UBD361E0.book Page 1 Monday, January 25, 2016 10:53 AM

3-1
3
EBU17681
DESCRIPTION
EBU17691Left view
EBU17701Right view
1. Fuel tank cap
2. Fuel cock
3. Air filter
4. Fuse
5. Battery
6. Rear shock absorber assembly spring preload adjusting ring
7. Kickstarter lever cap
1 2 3 4,5
76
1. Spark arrester
2. Owner’s tool kit
3. Front shock absorber assembly spring preload adjusting ring
4. Spark plug
5. Engine oil filler cap
6. Transmission oil filler cap
12 3
65 4
UBD361E0.book Page 1 Monday, January 25, 2016 10:53 AM

4-13
4
EBU18995Adjusting the front shock absorber as-
sembliesThe spring preload can be adjusted to suit the rid-
er’s weight and the riding conditions.
WARNING
EWB00401Always adjust the shock absorber assemblies
on the left and right side to the same setting.
Uneven adjustment can cause poor handling
and loss of stability, which could lead to an ac-
cident.
NOTICEECB01091Never turn the adjusting mechanism beyond
the minimum and maximum settings. Adjust the spring preload as follows.
Turn the spring preload adjusting ring in direction
(a) to increase the spring preload and thereby
harden the suspension, and in direction (b) to de-
crease the spring preload and thereby soften the
suspension.
Align the appropriate notch in the adjusting ring
with the position indicator on the shock absorber.
1. Projection
2. Seat holder
12
1. Spring preload adjusting ring
2. Position indicator
123 45
2
1(a)
(b)
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4-14
4
TIPA special wrench can be obtained at a Yamaha
dealer to make this adjustment.
EBU19024Adjusting the rear shock absorber as-
semblyThe spring preload can be adjusted to suit the rid-
er’s weight and the riding conditions.NOTICEECB01091Never turn the adjusting mechanism beyond
the minimum and maximum settings. Adjust the spring preload as follows.
Turn the spring preload adjusting ring in direction
(a) to increase the spring preload and thereby
harden the suspension, and in direction (b) to de-
crease the spring preload and thereby soften the
suspension.
1. Special wrenchSpring preload setting:Minimum (soft):1
Standard: 3
Maximum (hard): 5
1
UBD361E0.book Page 14 Monday, January 25, 2016 10:53 AM

8-6
8
5*Wheels • Check runout and for damage, and replace if nec-
essary. √ √√√
6 *Tires • Check tread depth and for damage, and replace if
necessary.
• Check air pressure and balance, and correct if necessary. √ √√√
7 *Wheel hub bearings • Check for looseness or damage, and replace if
necessary. √ √√√
8Drive chain • Check chain slack and adjust if necessary.
• Check rear wheel alignment and correct if neces-
sary.
• Clean and lubricate. √√√√√
9 *Drive chain rollers • Check for wear and replace if necessary. √√√
10 *V- b e l t • Check for wear, cracks or other damage, and re-
place if necessary. √ √√√
11 *Chassis fasteners • Make sure that all nuts, bolts, and screws are
properly tightened. √√√√√
12 *Shock absorber as-
semblies • Check operation and correct if necessary.
• Check for oil leakage and replace if necessary.
√√√
13 *Front knuckle piv-
ots • Lubricate with lithium-soap-based grease.
√√√
14 *Steering shaft • Lubricate with lithium-soap-based grease. √√√
NO. ITEM
CHECK OR MAINTENANCE
JOB INITIAL EVERY
Whichev-
er comes first month136612
km (mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 320UBD361E0.book Page 6 Monday, January 25, 2016 10:53 AM

9-1
9
EBU25861
CLEANING AND STORAGE
EBU25903CleaningFrequent, thorough cleaning of your ATV will not
only enhance its appearance but will improve its
general performance and extend the useful life of
many components.1. Before cleaning the ATV: a. Block off the end of the exhaust pipe toprevent water entry. A plastic bag and
strong rubber band may be used.
b. Make sure the spark plug and all filler caps are properly installed.
2. If the engine case is excessively greasy, apply degreaser with a paint brush. Do not apply
degreaser to the chain, sprockets or wheel
axles.
3. Rinse the dirt and degreaser off with a garden hose. Use only enough pressure to do the
job. WARNING! Wet brakes may have re-
duced stopping ability, increasing the
chance of an accident. Test the brakes af-
ter washing. Apply the brakes several
times at slow speeds to let friction dry out
the linings.
[EWB02312]
NOTICE: Excessive wa- ter pressure may cause water seepage
and deterioration of wheel bearings,
brakes, transmission seals and electrical
devices. Many expensive repair bills have
resulted from improper high-pressure de-
tergent applications such as those avail-
able in coin-operated car washers.
[ECB00712]
4. Once most of the dirt has been hosed off,
wash all surfaces with warm water and mild,
detergent-type soap. An old toothbrush or
bottle brush is handy for hard-to-reach pla-
ces.
5. Rinse the ATV off immediately with clean wa- ter and dry all surfaces with a chamois, clean
towel or soft absorbing cloth.
6. Dry the chain and lubricate it to prevent it from rusting.
7. Clean the seat with a vinyl upholstery cleaner to keep the cover pliable and glossy.
8. Automotive type wax may be applied to all painted and chrome plated surfaces. Avoid
combination cleaner-waxes. Many contain
UBD361E0.book Page 1 Monday, January 25, 2016 10:53 AM

10-3
10
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 operationRear brake:Type:Mechanical leading, trailing drum brake
Operation:
Left hand operation
Front 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 AhBulb voltage, wattage × quantity:Neutral indicator light:
12 V, 3.5 W × 1
Reverse indicator light: 12 V, 3.5 W × 1
UBD361E0.book Page 3 Monday, January 25, 2016 10:53 AM

12-2
12
Parking brake ................................................................. 4-5
Parking on a slope ......................................................... 6-5
Part locations ................................................................. 3-1RReverse indicator light ................................................... 4-1
Riding your ATV ............................................................. 7-1SSafety information .......................................................... 2-1
Seat .............................................................................. 4-12
Shock absorber assemblies, adjusting the front ......... 4-13
Shock absorber assembly, adjusting the rear ............. 4-14
Spark arrester, cleaning ............................................... 8-18
Spark plug, checking ..................................................... 8-9
Specifications .............................................................. 10-1
Speed limiter .................................................................. 4-3
Starter (choke) ............................................................. 4-11
Start switch .................................................................... 4-2
Steering shaft, lubricating ............................................ 8-30
Storage .......................................................................... 9-2TThrottle lever ...........................................................4-2, 5-3
Throttle lever free play, adjusting ................................ 8-20
Tires ............................................................................... 5-3
Transmission oil ....................................................5-3, 8-14
Troubleshooting ........................................................... 8-35
Troubleshooting chart .................................................. 8-36VValve clearance ............................................................ 8-21
Vehicle identification number ...................................... 11-1WWheel hub bearings, checking .................................... 8-29Wheel, installing ........................................................... 8-34
Wheel, removing .......................................................... 8-34
UBD361E0.book Page 2 Monday, January 25, 2016 10:53 AM