2009 YAMAHA YFM90R lock

4-4
44
The vehicle speed limiter keeps the throttle from fully
opening, even when the throttle lever is pushed to the
maximum. The adjusting screw may be gradually
turned out 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 limiter
will result in a significant increase in power, turn the
vehicle speed limiter adjusting screw completely back
in again; adjust it out in stages as done previously.Vehicle speed limiter1. Loosen the locknut.
2. To increase the maximum engine power available
and the maximum speed of the ATV, turn the
adjusting screw in direction (a). To decrease
the maximum engine power available and the
maximum speed of the ATV, turn the adjusting
screw in direction (b).
(b)
(a)
1 2
3. Tighten the locknut.2. Adjusting screw1. Locknut
3. No more than 11 mm (0.4 in)
3

4-7
Parking brake Use the parking brake before starting the engine or
parking the ATV, especially on a slope. Apply the
front bake lever and push down the lock button to
apply the parking brake. Squeeze the front brake
lever to release the parking brake.1. Parking brake lock button

4
1
WARNING
Always set the parking brake before starting
the engine. The ATV could start moving un-
expectedly if the parking brake is not ap-
plied. This could cause loss of control or a
collision.Always be sure you have released the park-
ing brake before you begin to ride. The brake
could overheat if you ride the ATV without re-
leasing the parking brake. You could lose
braking performance which could cause an
accident. You could also wear out the brakesprematurely.

4-8
Fuel tank cap Remove the fuel tank cap by turning it counter-
clockwise.FuelMake sure that there is sufficient fuel in the tank.
Fill the fuel tank to the bottom of the filler tube as
shown.1.Fuel tank cap 1. Fuel level
2. Filler tube
Recommended fuel:
UNLEADED GASOLINE ONLY
Fuel tank capacity: 4.8 L (1.27 US gal) (1.06 Imp.gal)
Fuel reserve amount: 1.0 L (0.26 US gal) (0.22 Imp.gal)
4
1
1 2

4-11
ChokeThe choke is used to start a cold engine.
Move the choke in direction (a) to turn on the
choke.
Move the choke in direction (b) to turn off the
choke.
See the “Starting a cold engine” section on page
6-1 for proper operation.1. Fully open “ON”
2. Half open (warming up position)
3. Closed “OFF”
4. Choke
1 2 3
(a)
(b)
4
4
SeatTo remove the seat
Pull the seat lock lever upward and pull up the seat
at the rear.
1
1. Seat lock lever

6-5
Parking on a slope1. Bring the ATV to a stop by applying the brakesin the drive position.
2. Stop the engine.
3. Apply the parking brake.
1. Parking brake lock button
1. Locked position
6
1
1
WARNING
Avoid parking on hills or other inclines. Park-
ing on a hill or other incline could cause the
ATV to roll out of control, increasing the
chance of an accident. If you must park on an
incline, place the ATV transversely across the
incline, stop the engine, apply the parking
brake, and then block the front and rear wheels
with rocks or other objects. Do not park the ATV at all on hills that are sosteep you could not walk up them easily.

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.

7-20
RIDING DOWNHILL
When riding your ATV downhill, shift your weight
as far to the rear and uphill side of the ATV as pos-
sible. Move back on the seat and sit with your arms
straight. Allow the engine compression to do most
of the braking for you. Improper braking may cause
a loss of traction.
Use caution while descending a hill with loose or
slippery surfaces. Braking ability and traction may
be adversely affected by these surfaces. Improper
braking may also cause a loss of traction.
Whenever possible, ride your ATV straight down-
7
WARNING
Maintain a steady speed when climbing a hill.
If you lose all forward speed:Keep weight uphill.Apply the brakes.Lock the parking brake after you are
stopped.
If you begin rolling backwards:Keep weight uphill.Never apply the rear brake while rolling
backwards. Apply the front brake.When fully stopped, apply the rear brake as
well, and then lock the parking brake.
Dismount on uphill side or to a side if pointed
straight uphill. Turn the ATV around and re-
mount, following the procedure described inthe Owner’s Manual.

8
8-23
Adjusting the front brake lever free
playThe brake lever free play must be checked and, if
necessary, adjusted at the intervals specified in
the periodic maintenance and lubrication chart.
1
The brake lever free play should measure 4.0–
6.0 mm (0.16–0.24 in) as shown. If the free play
is incorrect, adjust it as follows.101. Loosen the upper locknut and fully turn in the upper adjusting bolt.
2. Loosen the lower locknut.
3. Turn the lower adjusting bolt in direction (a) to increase the free play, and in direction (b) to
decrease it.
1. Brake lever free play
TIPBefore adjusting the brake lever free play, checkthe front brake shoes for wear.
3
3. No more than 12 mm (0.47 in)
1. Upper adjusting bolt
2. Lower adjusting bolt
2 1
to check the brake shoe wear without having to
disassemble the brake. To check the brake shoe
wear, there are two adjusting bolts to indicate brake
shoe wear. If the positions of adjusting bolts reach to
12mm (0.47in), the brake shoes should be replaced
as a set by Yamaha dealer.