2009 YAMAHA YFM90R fuel

9-2
StorageShort-term
Always store your ATV in a cool, dry place and, if
necessary, protect it against dust with a porous
cover.N O T I C EStoring the ATV in a poorly ventilated room
or covering it with a tarp while it is still wet,
will allow water and humidity to seep in and
cause rust.To prevent corrosion, avoid damp cellars,
stables (because of the presence of ammo-nia) and areas where strong chemicals arestored. Long-term
Before storing your ATV for several months:
1. Follow all the instructions in the “Cleaning” section of this chapter.
2. Turn the fuel cock lever to “OFF”.
3. Drain the carburetor float chamber by loosen- ing the drain bolt; this will prevent fuel deposits
from building up. Pour the drained fuel into the
fuel tank.
4. Fill up the fuel tank and add fuel stabilizer (if available) to prevent the fuel from deteriorat-
ing.
5. Perform the following steps to protect the cyl- inder, piston rings, etc. from corrosion.
a. Remove the spark plug cap and sparkplug.
b. Pour a teaspoonful of engine oil into the spark plug bore.
c. Install the spark plug cap onto the spark
Specified amount:
7.5 ml of stabilizer to each liter of fuel (or 1 oz
of stabilizer to each gallon of fuel)
9
WARNING
Wet brakes may have reduced stopping ability,
increasing the chance of an accident. Test the
brakes after washing. Apply the brakes several
times at slow speeds to let friction dry out thelinings.

10-1
10
SPECIFICATIONS
Engine:Engine type: Forced air cooled 4-stroke
Cylinder arrangement: Single cylinder
Displacement: 88 cm (5.37 cu.in)
3
Bore × stroke: 47.0 × 51.0 mm (1.85 x 2.0 in) Compression ratio:
Starting system: Electric starter & kickstarter
Lubrication system: Wet sump 10.2 : 1
Engine oil:Type:SAE10W-40 or SAE20W-50
Recommended engine oil grade: API service SG type or higher, JASO standard MA0 10 30
507090
110130 F
SAE 10W-40
SAE 5W-30
-20
-10 0 102030 40 50 C
SAE 20W-50
Dimensions:Overall length:
1490 mm (58.7 in)
Overall width: 885 mm (34.8 in)
Overall height: 910 mm (35.8 in)
Seat height: 654 mm (25.7 in)
Wheelbase: 1010 mm (39.8 in)
Ground clearance: 100 mm (3.9 in)
Minimum turning radius: 2900 mm (114 in)Weight:With oil and fuel: 120.0 kg (264 lb)

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
10
10-2

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