2009 YAMAHA YFM90R Owners Manual

4-5
4

WARNING
Improper adjustment of the speed limiter and
throttle could cause throttle cable damage or
improper throttle operation. You could lose
control, have an accident or be injured. Do not
turn the adjusting screw out more than 5 mm
(0.2 in).Engine speed limiter plate
TIPStore the speed limiter plate with the owner’s manual
so that it is readily available whenever you want to
reduce the top engine speed.
With this plate installed, the engine speed is limited
to 4800 r/min. With this plate removed, top engine
speed (8000 r/min) is available.
Remove the plate as follows.
1. Remove the seat. (See page 4-11.)
3. Pull the plate out of its case. 4. Tighten the screw.
2. Loosen the screws.
5. Install the seat.
1. Speed limiter plate
2. Screws
21

Front brake lever The front brake lever is located on the right handle-
bar. To apply the front brake, pull the brake lever
toward the handlebar grip.
1. Front brake lever
Rear brake lever The rear brake lever is located on the left handle-
bar. To apply the rear brake, pull the brake lever to-
ward the handlebar grip.
4-61. Rear brake lever
4
1
1

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

4-9
N O T I C EUse only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts, such as the valves and pistonrings, as well as to the exhaust system.
4
WARNING
Do not overfill the fuel tank. Fuel expands
when it heats up. If the fuel tank is overfilled,
fuel could spill out due to heat from the en-
gine or the sun.Be careful not to spill fuel, especially on the
engine or exhaust pipe which can cause a
fire and severe injury. Wipe up any spilled
fuel immediately.Do not refuel right after the engine has been
running and is still very hot.Be sure the fuel tank cap is closed securely.

Fuel cock The fuel cock supplies fuel from the tank to the car-
buretor while also filtering it.
The fuel cock lever positions are explained as fol-
lows and shown in the illustrations.1. Lever positioned over “OFF”
RES
OFFWith the fuel cock lever in this position, fuel will not
flow. Always turn the fuel cock lever to this position
when the engine is not running.ONRES
5
1. Lever positioned over “RES”
1. Lever positioned over “ON” 4-10 With the fuel cock lever in this position, fuel flows
to the carburetor. Turn the fuel cock lever to this
position when starting the engine and riding.
This indicates reserve. With the fuel cock lever in
this position, the fuel reserve is made available.
Turn the fuel cock lever to this position if you run
out of fuel while riding. When this occurs, refuel as
soon as possible and be sure to turn the fuel cock
lever back to “ON”!
OFF
ON
RES
FUEL
1OFF
OFF
ON
RES
FUELRES
1
OFF
ON
RES
FUEL
1
ON
4

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

4-12
To install the seat
Insert the projection on the front of the seat into the
seat holder and push down on the seat at the rear.TIPMake sure that the seat is securely fitted.
4
1. Projection
2. Seat holder
21
1.
Kickstarter
1
N O T I C E
A kickstarter lever is located under the seat to use
if the battery is discharged.
1. Install the kickstarter lever. 2. Move the kickstarter lever down lightly with your
foot until the gears engage, and then push it
down smoothly but forcefully.Kickstarter
Do not use the kickstarter if there is no battery
installed or if the battery leads are disconnected.