2009 YAMAHA YFM90R air filter

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

7-24
N O T I C E
After riding your ATV in water, be sure to drain
the trapped water by removing the check hose
at the bottom of the air filter case. Wash the
ATV in fresh water if it has been operated insalt water or muddy conditions.RIDING OVER ROUGH TERRAIN
Riding over rough terrain should be done with cau-
tion. Look out for obstacles which could cause
damage to the ATV or could lead to an upset or ac-
cident. Be sure to keep your feet firmly mounted on
the footboards at all times. Avoid jumping the ATV
as loss of control and damage to the ATV may re-
sult.
1. Air lter case check hose
7
1

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.

8-15
8
Tightening torque:Final transmission oil drain bolt:15 Nm (1.5 m·kgf, 10.8 ft·lbf)5. Add the specified amount of the recommend- ed final transmission oil, and then check the
oil level.N O T I C E Be sure no foreign material enters the final
transmission case.
6. Install and tighten the oil filler cap.
7. Check the final transmission case for oil leakage. If oil is leaking, check for the cause.
Recommended final transmission oil:
See page 10-1.
Oil quantity: 0.30 L (0.32 US qt) (0.27 Imp.qt)
Cleaning the air filter element The air filter element should be cleaned at the in-
tervals specified in the periodic maintenance and
lubrication chart. Clean the air filter element more
frequently if you are riding in unusually wet or dusty
areas.TIPThere are check hoses at the bottom of the air filter
case. If dust or water collects in these hoses, empty1. Air filter case check hose (left)
1
them and clean the air filter element and air filter
case.

8-16
8
1
2
2
2
1. Remove the air filter case cover by remov-
ing the bolts.
1. Air filter case cover (left)
2. Bolts
1. Air filter case check hose (right)
1
1. Air filter case cover (right)
2. Bolts
2
2
2 1

N O T I C EDo not twist the sponge material when squeez-ing it.5. Check the sponge material and replace it if damaged.
1. Air filter element holder
2. Sponge material
1
2
8
8-17
2. Remove the air filter element by removing the
3. Wash the sponge material gently but thor- oughly in solvent. 4. Squeeze the excess solvent out of the sponge
material and let it dry.
screw, and then pull off the sponge material
from the air filter element holder.
WARNING
Always use parts cleaning solvent to clean the
sponge material. Never use low-flash-point
solvents or gasoline to clean the sponge mate- rial because the engine could catch fire or ex-
plode.

8-18
6. Apply Yamaha foam air filter oil or other qual-ity foam air filter oil to the sponge material.TIPThe sponge material should be wet but not drip-ping.
7. Install the sponge material onto the air filter element holder.
8. Place the air filter element in the original position, and then install the screw.
9. Install the air filter case cover by installing the bolts.TIPThe air filter element should be cleaned every 20–
40 hours. It should be cleaned and lubricated more
often if the ATV is operated in extremely dusty ar-
eas. Each time the air filter element maintenance
is performed, check the air inlet of the air filter casefor obstructions.N O T I C E Make sure that the air filter element is prop-
erly seated in the air filter case.Never operate the engine with the air filter el- ement removed. This will allow unfiltered air
to enter the engine, causing rapid engine
wear and possible engine damage. Addition-
ally, operation without the air filter element
will affect carburetor jetting with subsequent
poor performance and possible engine over-
heating.
8

10
Engine oil quantity:Periodic oil change: 0.8 L (0.84 US qt) (0.70 Imp.qt)Final transmission oil:Type:SAE80 API GL-4 Hypoid gear oil
Quantity: 0.30 L (0.32 US qt) (0.27 Imp.qt)Air filter:Air filter element: Wet elementFuel:Recommended fuel: Regular unleaded gasoline only (EUR)
Unleaded gasoline only (AUS)(NZL)
Fuel tank capacity: 4.8 L (1.27 US gal) (1.06 lmp.gal)
Fuel reserve amount: 1.0 L (0.26 US gal) (0.22 Imp.gal)Carburetor:Manufacturer:TK
Type x quantity: SVR 22-1G x 1Spark plug (s):Manufacturer/model:NGK/CR7HSA
Spark plug gap: 0.6–0.7 mm (0.024–0.028 in)
Chassis:Frame type: Steel tube frame
Caster angle: 4.0 °
Trail: 16 mm (0.63 in)
Front tire:Type:Tubeless
Size: AT18 x 7-8
Manufacturer/model: MAXXIS/M939
Clutch:Clutch type: Dry, centrifugal automatic
Transmission:Primary reduction system: V-belt
Primary reduction ratio:
2.47-0.61:1
Secondary reduction system: Spur
Secondary reduction ratio: 41/15 × 45/13 (9.462)
Third reduction system:
Chain drive
Third reduction ratio: 28/13(2.154)
Transmission type: V-belt automatic
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10-2