2009 YAMAHA YFM90R brake fluid

Cleaning the spark arrester ...................... 8-19
Adjusting the carburetor ........................... 8-20
Adjusting the engine idling speed ............ 8-20
Checking the throttle cable free play ....... 8-21
Timing chain ............................................ 8-22
Valve clearance ....................................... 8-22
Checking the front brake shoes................ 8-22
Adjusting the front brake lever free play ....................................................... 8-23
Checking the rear brake pads ................. 8-25
Checking the brake fluid level ................. 8-25
Changing the rear brake fluid .................. 8-26
Checking the rear brake lever free play ........................................................8-26
Checking and lubricating the cables........ 8-27
Checking and lubricating the front and rear brake levers............................... 8-27
Checking the wheel hub bearings ............ 8-28
Battery ..................................................... 8-28
Replacing the fuse ................................... 8-30
Removing a wheel ................................... 8-32
Installing a wheel ..................................... 8-33
Troubleshooting ....................................... 8-34
Troubleshooting chart .............................. 8-35
RIDING YOUR ATV ...................................... 7-1
GETTING TO KNOW YOUR ATV...............7-2
RIDE WITH CARE AND GOOD JUDGEMENT ............................................ 7-2
BE CAREFUL WHERE YOU RIDE...........7-11
TURNING YOUR ATV..............................7-15
CLIMBING UPHILL....................................7-17
RIDING DOWNHILL..................................7-20
CROSSING A SLOPE................................7-21
CROSSING THROUGH SHALLOW WATER ................................................... 7-22
RIDING OVER ROUGH TERRAIN...........7-24
SLIDING AND SKIDDING.........................7-25
WHAT TO DO IF.......................................7-26
WHAT TO DO... ........................................ 7-26
PERIODIC MAINTENANCE AND MINOR
REPAIR..........................................................8-1 Owner’s manual and tool kit ...................... 8-1
Periodic maintenance chart for the emission control system .......................... 8-3
General maintenance and lubrication chart ........................................................ 8-5

Checking the spark plug ............................. 8-9
Engine oil ................................................. 8-11
Final transmission oil ................................ 8-14
Cleaning the air filter element .................. 8-15 CLEANING AND STORAGE.........................9-1
Cleaning ..................................................... 9-1
Storage ...................................................... 9-2 Brakes ..................................................... 8-22

9
Make sure that operation is smooth, and check cable free play.Lubricate cable and lever housing if necessary.
Control cablesMake sure that operation is smooth. Lubricate if necessary. 8-27
Wheels and tiresCheck wheel condition, and replace if damaged.Check tire condition and tread depth. Replace if necessary.Check air pressure. Correct if necessary. 5-4, 5-5, 5-6
Brake leversMake sure that operation is smooth. Lubricate lever pivoting points
if necessary. 8-27
Chassis fastenersMake sure that all nuts, bolts and screws are properly tightened. 5-7
Instruments and switchesCheck operation, and correct if necessary. 5-7
2
5-2
9
Throttle lever 5-4, 8-21
5
PAGE
ROUTINE
METIT
Fuel
Check fuel line for leakage. Correct if necessary . 4-8, 5-3Check A TV for oil leakage. Correct if necessary .5-3, 8-11
Final transmission oil
5-3, 8-14
Check ATV for oil leakage. Correct if necessary.
Front brake
Check operation, and correct if necessary.Lubricate cable if necessary .Check lever free play , and adjust if necessary. 5-3, 8-22, 8-23
Engine oil
Check fuel level in fuel tank, and add recommended fuel if neces-
sary.Check brake pads for wear, and replace if necessary.
Check brake fluid level in reservoir, and add recommended brake fluid to specified level if necessary.
Check hydraulic system for leakage. Correct if necessary. Check operation. If soft or spongy, have Yamaha dealer bleed
hydraulic system.
Rear brake 5-3, 8-25, 8-26
Check oil level in engine, and add recommended oil to specified
level if necessary.

5-3
FuelMake sure that there is sufficient fuel in the tank.
(See page 4-8.)
Engine oilMake sure that the engine oil is at the specified lev-
el. Add oil as necessary. (See page 8-11.)
Final transmission oilMake sure that the final transmission oil is at the
specified level. Add oil as necessary.
(See page 8-14.)Front and rear brakesRecommended brake fluid:
DOT4
3
Brake fluid leakage
Check to see if any brake fluid is leaking out of the
pipe joint or brake fluid reservoir. Apply the brake
firmly for one minute. If there is any leakage, have a
Yamaha dealer check the brake system.Brake leversCheck for correct free play in the brake levers. If
the free play is incorrect, adjust it. (See pages
8-23 and 8-26.)Check operation of the levers. They should
move smoothly and there should be a firm feel-
ATV checked by a Yamaha dealer.
6
Brake fluid level
Check the brake fluid level. Add fluid if necessary.
(See page 8-25.)
15
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.
ing when the brakes are applied. If not, have the

8-8
TIP
8
The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
Hydraulic brake service Regularly check and, if necessary, correct the brake fluid level.Every two years replace the internal components of the brake master cylinder and caliper, and
change the brake fluid. Replace the brake hoses every four years and if cracked or damaged.

8-25
The rear brake pads must be checked for wear at the
intervals specified in the periodic maintenance and
lubrication chart. Each brake pad is provided with
wear indicator grooves, which allow you to check the
brake pad wear without having to disassemble the
brake. If a brake pad has worn to the point that the
wear indicator grooves have almost disappeared,
have a Yamaha dealer replace the brake pads as a
set.Checking the rear brake pads
Insufficient brake fluid may allow air to enter the brake
system, possibly causing it to become ineffective.
Before riding, check that the brake fluid is above the
minimum level mark and replenish if necessary.
A low brake fluid level may indicate worn brake pads
and/or brake system leakage. If the brake fluid level
is low, be sure to check the brake pads for wear and
the brake system for leakage.Checking the brake fluid level 1. Wear indicator groove
8
1
After servicing:Make sure the brakes operate smoothly and
that the free play is correct.Make sure the brakes do not drag.
Replacement of brake components requires
professional knowledge. These proceduresshould be performed by a Yamaha dealer.

Changing the rear brake fluidChecking the rear brake lever free play
The brake lever free play must be checked at the
intervals specified in the periodic maintenance and
lubrication chart. The brake lever free play should
measure 0 – 1.5 mm (0 – 0.06 in) as shown. If
the free play is incorrect, have a Yamaha dealer
check the brake system.
1
LOWER
1
8-26
8
Recommended brake fluid:
DOT4
1. Brake lever free play
1. Minimum level mark
Have a Yamaha dealer change the rear brake fluid
at the intervals specified in the TIP after the periodic
maintenance and lubrication chart. In addition,
have the oil seals of the master cylinders and
calipers as well as the brake hoses replaced at the
intervals listed below or whenever they are damaged
or leaking.
Oil seals: Replace every two years.Brake hoses: Replace every four years.

10-3
10
Rear tire:Type:Tubeless
Size: AT18 x 9-8
Manufacturer/model: MAXXIS/M940Loading:Maximum loading limit: 70.0 kg (154 lb)
(Total weight of rider, cargo, accessories, and tongue)Tire air pressure (measured on cold tires):Recommended:Front:25 kPa (3.6 psi) (0.25 kgf/cm
2)
Rear: 25 kPa (3.6 psi) (0.25 kgf/cm2)
Minimum: Front:22 kPa (3.2 psi) (0.22 kgf/cm2)
Rear: 22 kPa (3.2 psi) (0.22 kgf/cm2)
Front wheel:
Wheel type: Panel wheel
Rim size: 8 x 5.5AT
Rear wheel:Wheel type: Panel wheel
Rim size: 8 x 7ATFront brake:Type:Drum brake
Operation: Right hand operationRear brake:Type:Single disc brake
Operation: Left hand operation
Recommended fluid: DOT4Front suspension:Type:Double wishbone
Spring/shock absorber type: Coil spring/oil damper
Wheel travel:
111 mm (4.4 in)

INDEX
AAccessories and loading ................................................ 6-6
Air filter element, cleaning ............................................ 8-15BBattery ........................................................................\
...8-28
Brake lever, front.............................................................4-6Brake lever, rear............................................................4-6
Brake lever free play, checking the rear........................8-26
Brake levers, checking and lubricating .............. .......... 8-27
Brakes, front and rear....................................................5-3
Brake pads, checking the rear.......................................8-25
Brake fluid level, checking the rear...............................8-25
Brake fluid level, changing the rear..............................8-26 Brake lever free play, adjusting the front......................8-23CCables, checking and lubricating ................................. 8-27
Carburetor, adjusting.................................................... 8-20
Chassis fasteners........................................................... 5-7
Cleaning..........................................................................9-1EEngine break-in .............................................................. 6-4
Engine, cold start...........................................................6-1
Engine idling speed ...................................................... 8-20 Engine oil............................................................5-3, 8-11
Engine, starting a warm................................................6-3
Engine stop switch.......................................................4-2
Fuel........................................................................4-8, 5-3
Fuel cock......................................................................4-10
Fuel tank cap..................................................................4-8
Fuse, replacing.............................................................8-30
F
KKey identification number ............................................. 11-1LLabel locations...............................................................2-1HHandlebar switches ........................................................ 4-2IIdentification numbers .................................................. 11-1
Instruments and switches.............................................5-7MMain switch .................................................................... 4-1
Maintenance and lubrication chart.................................8-5
Maintenance chart, emission control system.................8-3
Model label...................................................................11-2
Choke ............................................................................ 4-11 Brake shoes, checking the front .................................. 8-22
Final transmission oil ........................................... 5-3, 8-14
Engine speed limiter plate............................................ 4-5
Kick starter ................................................................. 4-12