YAMAHA YFM90R 2009 Manual PDF

7-25
SLIDING AND SKIDDING
Care should be used when riding on loose or slip-
pery surfaces since the ATV may slide. If unex-
pected and uncorrected, sliding could lead to an
accident.
To reduce the tendency for the front wheels to slide
in loose or slippery conditions, positioning your
weight over the front wheels will sometimes help. If the rear wheels of your ATV start to slide side-
ways, control can usually be regained (if there is
room to do so) by steering in the direction of the
slide. Applying the brakes or accelerating is not
recommended until you have corrected the slide.
7
WARNING
Before operating in a new area, check for ob-
stacles. Never attempt to ride over large obsta-
cles, such as large rocks or fallen trees. When
you go over obstacles, always follow proper
procedures as described in the Owner ’s Manu-al.

7-26
With practice, over a period of time, skill at con-
trolled sliding can be developed. The terrain
should be chosen carefully before attempting such
maneuvers, since both stability and control are re-
duced. Bear in mind that sliding maneuvers should
always be avoided on extremely slippery surfaces
such as ice, since all control may be lost.WHAT TO DO IF...
This section is designed to be a reference guide
only. Be sure to read each section on riding tech-
niques completely.
WHAT TO DO...
If your ATV doesn’t turn when you want it to:
Bring the ATV to a stop and practice the turning
maneuvers again. Be sure you are putting your
weight on the footboard to the outside of the
turn. Position your weight over the front wheels
for better control. (See page 7-15.)If your ATV begins to tip while turning:
7
WARNING
Learn to safely control skidding or sliding by
practicing at low speeds and on level, smoothterrain.
On extremely slippery surfaces, such as ice,
go slowly and be very cautious in order to re-
duce the chance of skidding or sliding out of
control.

7-27
Lean more into the turn to regain balance. If nec-
essary, gradually let off the throttle and/or steer
to the outside of the turn. (See page 7-15.)If your ATV starts to slide sideways:
Steer in the direction of the slide if you have the
room. Applying the brakes or accelerating is not
recommended until you have corrected the
slide. (See page 7-25.)If your ATV can’t make it up a hill you are trying
to climb:
Turn the ATV around if you still have forward
speed. If not, stop, dismount on the uphill side of
the ATV and physically turn the ATV around. If
the ATV starts to slip backwards, DO NOT USE
THE REAR BRAKE – the ATV may tip over on
top of you. Instead, apply the front brake or dis-
mount the ATV on the uphill side. (See
page 7-17.)If your ATV is traversing a sloping surface:
Be sure to ride with your weight positioned to-
wards the uphill side of the ATV to maintain
proper balance. If the ATV starts to tip, steer
down the hill (if there are no obstacles in your
way) to regain balance. If you discover that the
ATV is going to tip over, dismount on the uphill
side. (See page 7-21.)
If your ATV encounters shallow water:
Ride slowly and carefully through slow moving
water, watching for obstacles. Be sure to let wa-
ter drain from the ATV and CHECK YOUR
BRAKES FOR PROPER OPERATION when
you come out of the water. Do not continue to
ride your ATV until you have regained adequate
braking ability. (See page 7-22.)
7

8-1
PERIODIC MAINTENANCE AND MINOR REPAIR
Safety is an obligation of the owner. Periodic in-
spection, adjustment and lubrication will keep your
ATV in the safest and best operating condition
possible. The most important points of inspection,
adjustment, and lubrication are explained on the
following pages.
The intervals given in the periodic maintenance
and lubrication chart should be considered as a
general guide under normal riding conditions.
However, DEPENDING ON THE WEATHER,
TERRAIN, GEOGRAPHICAL LOCATION, AND
INDIVIDUAL USE, THE MAINTENANCE INTER-
VALS MAY NEED TO BE SHORTENED.
Owner’s manual and tool kit Be sure to put this owner’s manual in the plastic
bag and to always carry it as well as the owner’s
tool kit and the low-pressure tire gauge in their re-
spective compartments under the seat.
8
WARNING
Never service an engine while it is running.
Moving parts can catch clothing or parts of the
body, causing injury. Electrical components
can cause shocks or start fires. Turn off the en-
gine when performing maintenance unlessotherwise specified. Have a Yamaha dealer
perform the service if you are not familiar with
maintenance work.

8-2
it for you.
1. Owner ’s manual
2. Low-pressure tire gauge
3. Owner ’s tool kitThe service information included in this manual
and the tools provided in the owner’s tool kit are in-
tended to assist you in the performance of preven-
tive maintenance and minor repairs. However,
additional tools such as a torque wrench may be
necessary to perform certain maintenance work
correctly.
TIPIf you do not have the tools or experience required
for a particular job, have a Yamaha dealer perform
5TH-28199-66YFM90ROWNER'S MANUAL
1626-21-38This ATV
shoul
d not be ridden by anyone under
years.
e
g
a
f
o
WARNING
READ THIS MANUAL CAREFULLY!
It contains important safety information.
8
1
23
WARNING
Never modify this ATV through improper in-
stallation or use of accessories, as it may
cause changes in handling, which in some sit-
uations could lead to an accident. All parts and
accessories added to this ATV should be gen-
uine Yamaha or equivalent components de-
signed for use on this ATV and should be
installed and used according to instructions. If
you have questions, consult an authorizedYamaha ATV dealer.

8-3
Periodic maintenance chart for the emission control system TIPFor ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals.For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance inter-
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.NO.ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes rst month 1 3 6 6 12
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 3201 *Fuel line
Check fuel hoses for cracks or other damage, and
replace if necessary. √ √ √
2 Spark plugCheck condition and clean, regap, or replace if
necessary. √ √ √ √ √
3 *ValvesCheck valve clearance and adjust if necessary.
√√ √ √
4 *CarburetorCheck choke operation and correct if necessary.Check engine idling speed and adjust if neces-
sary. √ √ √ √
5 *
Crankcase breather
systemCheck breather hose for cracks or other damage,
and replace if necessary. √ √ √
8
vals. However, keep in mind that if the ATV isn’t used for a long period of time, the month maintenance

8-4
6
*Exhaust system
Check for leakage and replace gasket(s) if neces-
sary.Check for looseness and tighten all screw clamps
and joints if necessary.
7 Spark arresterClean.
NO.ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes rst month 1 3 6 6 12
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 320
8

8-5
General maintenance and lubrication chart NO.ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes rst month 1 3 6 6 12
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 3201 *Timing chain
Check chain tension.Adjust if necessary. √
√ √ √
2 Air lter elementClean and replace if necessary. Every 20–40 hours (more often in wet or
dusty areas)
4 *Front brakeCheck operation and correct if necessary.Check brake lever free play and adjust if neces-
sary. √ √ √ √ √Replace brake shoes.
Whenever worn to the limit
7
*Wheels
Check runout and for damage, and replace if nec-
essary. √
√ √ √
8 *TiresCheck tread depth and for damage, and replace if
necessary.Check air pressure and balance, and correct if
necessary. √
√ √ √
8
5
*Rear brake
Check operation and correct if necessary.Check uid level and ATV for uid leakage, and
correct if necessary. √ √ √ √ √Replace brake pads.
Whenever worn to the limit
6 *Brake hosesCheck for cracks or other damage, and replace if
necessary. √ √ √ √Replace.
Every 4 years
3
*Clutch
Check operation.
√√ √ √

8-6
11
*Shock absorber
assemblies
Check operation and correct if necessary.Check for oil leakage and replace if necessary. √ √ √
12 *
Front knuckle piv-
otsLubricate with lithium-soap-based grease.
√ √ √
13 *Steering shaftLubricate with lithium-soap-based grease.
√ √ √
14 *Steering systemCheck operation and repair or replace if damaged.Check toe-in and adjust if necessary. √ √ √ √ √
Engine oilChange.Check ATV for oil leakage, and correct if neces-
sary. √
√ √ √Change.
NO.ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes rst month 1 3 6 6 12
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 32017
Check ATV for oil leakage, and correct if neces-
sary. √
√
18 *
Moving parts and
cablesLubricate.
√ √ √ √
8
9
*Wheel hub bearings
Check for looseness or damage, and replace if
necessary. √
√ √ √
10 *Chassis fastenersMake sure that all nuts, bolts, and screws are
properly tightened. √ √ √ √ √
1516
Engine oil strainer Clean.
√√ √
Final transmission oil

8-7
8
NO.ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes first month 1 3 6 6 12
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 32019 *Drive select lever
safety system cable • Check operation and adjust or replace if neces-
sary. √ √ √
20 *Throttle lever hous-
ing and cable • Check operation and correct if necessary.
• Check throttle cable free play and adjust if neces-
sary.
• Lubricate throttle lever housing and cable. √ √ √ √ √
21 *Front and rear brake
switches • Check operation and correct if necessary.
√ √ √ √ √
22 *Lights and switches • Check operation and correct if necessary.
• Adjust headlight beams.
√ √ √ √ √
√ √ √
23
* V-belt
Check operation
√Check for wear, cracks or other damage, and replace
if necessary.