YAMAHA YFM90R 2009 Workshop Manual

7-51. Protective clothing
2. Goggles
3. Gloves
4. Boots
5. Helmet
7
WARNING
Never operate this ATV without wearing an ap-
proved motorcycle helmet, eye protection and
protective clothing. Operating without an ap-
proved motorcycle helmet increases your
chances of a severe head injury or death in the
event of an accident. Operating without eye
protection can result in an accident and in-
creases your chances of a severe injury in the
event of an accident. Operating without protec-
tive clothing increases your chances of severeinjury in the event of an accident.Apparel
Always wear an approved motorcycle helmet that
fits properly.
You should also wear:
eye protection (goggles or face shield)glovesbootslong-sleeved shirt or jacketlong pants

7-6
Do not operate after consuming alcohol or
drugs.
The operator’s performance capability is reduced
by the influence of alcohol or drugs.Pre-operation checks
Always perform the pre-operation checks listed on
page 5-1 before riding for proper care of the ATV
and to ensure safety.
7
WARNING
Never consume alcohol or drugs before orwhile driving this ATV.
WARNING
Always inspect your ATV each time you use it
to make sure the ATV is in safe operating con-
dition. Always follow the inspection and main-
tenance procedures and schedules described
in the Owner’s Manual. Failure to inspect the
ATV before operating or failure to properly
maintain the ATV increases the possibility ofan accident or equipment damage.

7-7
Do not operate at speeds too fast for your
skills or the conditions.Speed limiters
For riders less experienced with this model, the
throttle lever housing is equipped with a vehicle
speed limiter. This speed limiter keeps the throttle
from fully opening, even when the throttle lever is
pushed to the maximum. Turning in the adjusting
screw limits the maximum engine power available
and decreases the maximum speed of the ATV.
Turning in the adjusting screw decreases top speed,
and turning it out increases top speed.
(See pages 4-3 and 4-4.)
7
This model also has an engine speed limiter plate
to limit the amount of engine power available.
WARNING

Always use the size and type tires specified in
the Owner’s Manual for this ATV on page 5-4.
Always maintain proper tire pressure as de-
scribed in the Owner’s Manual on page 5-5.
Use of improper tires on this ATV, or operation
of this ATV with improper or uneven tire pres-
sure, may cause loss of control, increasingyour risk of an accident.
WARNING
Always go at a speed that is proper for the ter-
rain, visibility and operating conditions, and
your experience. Operating this ATV at speeds
too fast for your skills or the conditions in-
creases your chances of losing control of theATV, which can result in an accident.
Yamaha recommends that all beginning riders start
off with the vehicle speed limiter turned in and the
engine speed limiter plate installed to limit the amount
of speed available while they learn. The vehicle speed
limiter may be gradually adjusted to increase maximum
speed as the beginner becomes more familiar with
operating the ATV. Parents should decide when to
adjust the ATV for more power as their youngster’s
riding skills improve. Once the ATV rider can operate
with skill at the top speed permitted by adjusting the
vehicle speed limiter alone, the engine speed limiter
plate can be removed. Since removal of this plate will

7-8
result in a significant increase in power, turn the vehicle
speed limiter adjusting screw back in again; adjust it
out in stages as you did before. For engine speed
limiter plate removal instructions, see page 4-4.Loading and accessories
Use extra caution when riding the ATV with addi-
tional loads, such as accessories or cargo. The
ATV’s handling may be adversely affected. Re-
duce your speed when adding additional loads.
2. Adjusting screw
MAXIMUM LOADING LIMIT
ATV loading limit (total weight of cargo, rider,
accessories, and tongue):70.0 kg (154 lb)
7
1. Locknut
1
2
WARNING
Never exceed the stated load capacity for
this ATV.Cargo should be properly distributed and se-
curely attached.Reduce speed when carrying cargo or pull-
ing a trailer. Allow greater distance for brak-
ing.Always follow the instructions in your Own-
er’s Manual for carrying cargo or pulling atrailer.

7-9
Avoid wheelies and jumping. You may lose control
of the ATV or overturn.
7
During operation
Always keep your feet on the footboards during op-
eration, otherwise they may contact the rear
wheels.
WARNING
Always keep both hands on the handlebars
and both feet on the footboards of your ATV
during operation. Removing even one hand or
foot can reduce your ability to control the ATV
or could cause you to lose your balance and
fall off of the ATV. If you remove a foot from a
footboard, your foot or leg may come into con-
tact with the rear wheels, which could injureyou or cause an accident.

7-10
ModificationsExhaust system
The exhaust system on the ATV is very hot during
and following operation. To prevent burns, avoid
touching the exhaust system. Park the ATV in a
place where pedestrians or children are not likely
to touch it.
7
WARNING
Never attempt stunts, such as wheelies orjumps. Don’t try to show off.
WARNING
Never modify this ATV through improper in-
stallation or use of accessories. 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.
Improper installation of accessories or modifi-
cation of this ATV may cause changes in han-
dling which in some situations could lead to an
accident. If you have questions, consult an au-thorized ATV dealer.

7-11
BE CAREFUL WHERE YOU RIDE
This ATV is designed for off-road use only. Riding
on paved surfaces can cause loss of control.
7
WARNING
Do not touch the hot exhaust system.Do not park the ATV during or after operation
in a place where others might be likely to
touch it.Do not operate, idle, or park the ATV in dry
grass, dry ground cover, or combustible ma-terials.
10
11
WARNING
Always avoid paved surfaces, including side-
walks, driveways, parking lots and streets.
ATVs are designed for use on unpaved surfac-
es only. Paved surfaces may seriously affect
handling and control of the ATV, and maycause the ATV to go out of control.

7-12
7
While riding on unpaved public streets or roads
may be legal in your area, such operation can in-
crease the risk of collision with other vehicles.
Watch carefully for other vehicles. Make sure you
know your country’s laws and regulations before
you ride on unpaved public streets or roads. Do not
ride on any paved public street, road or motorway.
WARNING
Never operate this ATV on any paved street,
paved road or motorway. You can collide with
another vehicle. In many areas, it is illegal to
operate ATVs on public streets, roads andhighways.

7-13
Know the terrain where you ride. Ride cautiously in
unfamiliar areas. Stay alert for holes, rocks, or
roots in the terrain, and other hidden hazards
which may cause the ATV to upset.
7
WARNING
Go slowly and be extra careful when operating
on a paved paved road or motorway. You can
collide with another vehicle. In many areas, it
is illegal to operate ATVs on public streets, roads and highways.
WARNING
Do not operate on excessively rough, slippery
or loose terrain until you have learned and
practiced the skills necessary to control the
ATV on such terrain. Failure to use extra care
when operating on excessively rough, slippery
or loose terrain could cause loss of traction or
ATV control, which could result in an accident,including an overturn.

7-14
When riding in an area where you might not easily
be seen, such as desert terrain, mount a caution
flag on the ATV. DO NOT use the flag pole bracket
as a trailer hitch.
7
WARNING
Always mount a caution flag on the ATV to
make you more visible when operating in areas
where you might not be seen by other vehicles.Watch carefully for other vehicles.