2020 YAMAHA YFZ50 transmission

9-1
9
EBU25861
CLEANING AND STORAGE
EBU25903CleaningFrequent, thorough cleaning of your ATV will not
only enhance its appearance but will improve its
general performance and extend the useful life of
many components.1. Before cleaning the ATV: a. Block off the end of the exhaust pipe toprevent water entry. A plastic bag and
strong rubber band may be used.
b. Make sure the spark plug and all filler caps are properly installed.
2. If the engine case is excessively greasy, apply degreaser with a paint brush. Do not apply
degreaser to the chain, sprockets or wheel
axles.
3. Rinse the dirt and degreaser off with a garden hose. Use only enough pressure to do the
job. WARNING! Wet brakes may have re-
duced stopping ability, increasing the
chance of an accident. Test the brakes af-
ter washing. Apply the brakes several
times at slow speeds to let friction dry out
the linings.
[EWB02312]
NOTICE: Excessive wa- ter pressure may cause water seepage
and deterioration of wheel bearings,
brakes, transmission seals and electrical
devices. Many expensive repair bills have
resulted from improper high-pressure de-
tergent applications such as those avail-
able in coin-operated car washers.
[ECB00712]
4. Once most of the dirt has been hosed off,
wash all surfaces with warm water and mild,
detergent-type soap. An old toothbrush or
bottle brush is handy for hard-to-reach plac-
es.
5. Rinse the ATV off immediately with clean wa- ter and dry all surfaces with a chamois, clean
towel or soft absorbing cloth.
6. Dry the chain and lubricate it to prevent it from rusting.
7. Clean the seat with a vinyl upholstery cleaner to keep the cover pliable and glossy.
8. Automotive type wax may be applied to all painted and chrome plated surfaces. Avoid
combination cleaner-waxes. Many contain
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Engine oil:Recommended brand:
SAE viscosity grades:5W-30, 10W-30, 10W-40, 15W-40, 20W-40, 20W-50
Recommended engine oil grade: API service SG type or higher, JASO standard MA
Quantity: Oil change: 0.80 L (0.85 US qt, 0.70 Imp.qt)Transmission oil:Type:SAE 80W-90
Quantity: 0.35 L (0.37 US qt, 0.31 Imp.qt)
Air filter:Air filter element:Wet element
Air filter oil grade:
Foam air-filter oilFuel:Recommended fuel:Regular unleaded gasoline only
Minimum research octane:
91
Fuel tank capacity: 5.6 L (1.5 US gal, 1.2 Imp.gal)
Fuel reserve amount: 0.7 L (0.18 US gal, 0.15 Imp.gal)Carburetor:Type × quantity:
VM12 × 1Spark plug (s):Manufacturer/model:
NGK/CR6HSA
Spark plug gap: 0.6–0.7 mm (0.024–0.028 in)Drivetrain:Primary reduction ratio:
1.000
Secondary reduction ratio: 2.923 (38/13)
Final drive: Chain
Clutch type:
Dry, centrifugal, shoe
0 10 30 50 70 90 110 130 ˚F
–20 –10 0 10 20 30 40 50 ˚CSAE 5W-30
SAE 10W-30
SAE 10W-40
SAE 15W-40
SAE 20W-40SAE 20W-50
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Transmission type:CVT automatic
Gear ratio: Transmission ratio:2.140–0.710 : 1
Forward gear: 10.967 (49/15 x 47/14)Front tire:Size:AT16x6.5-7
Manufacturer/model: DURO/DI2040Rear tire:Size:AT16x7-7
Manufacturer/model: DURO/DI2041Tire air pressure (measured on cold tires):Vehicle load:0.0–41.0 kg (0–90 lb)
Recommended: Front:15.0 kPa (0.150 kgf/cm², 2.2 psi)
Rear: 15.0 kPa (0.150 kgf/cm², 2.2 psi)
Minimum:
Front:12.0 kPa (0.120 kgf/cm², 1.7 psi)
Rear:
12.0 kPa (0.120 kgf/cm², 1.7 psi)
Front wheel:Rim size:7 x 5.2ATRear wheel:Rim size:7 x 5.2ATFront brake:Type:
Mechanical leading, trailing drum brakeRear brake:Type:Mechanical leading, trailing drum brakeFront suspension:Type:Swing axle
Spring: Coil spring
Shock absorber:
Gas-hydraulic damper
Wheel travel: 60 mm (2.4 in)Rear suspension:Type:
Swingarm
Spring: Coil spring
Shock absorber: Gas-hydraulic damper
Wheel travel:
51 mm (2.0 in)
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Part locations ................................................................. 3-1RRiding your ATV ............................................................. 7-1SSafety information .......................................................... 2-1
Seat .............................................................................. 4-13
Shock absorber, rear ...................................................4-13
Spark arrester, cleaning ............................................... 8-19
Spark plug, checking .....................................................8-9
Specifications ............................................................... 10-1
Speed limiter .................................................................. 4-3
Starter (choke) .............................................................. 4-12
Start switch .................................................................... 4-2
Steering shaft, lubricating ............................................ 8-32
Storage ........................................................................... 9-2TThrottle lever .......................................................... 4-3, 5-3
Throttle lever free play, adjusting ................................. 8-22
Tires ............................................................................... 5-3
Transmission oil ................................................... 5-3, 8-15
Troubleshooting ........................................................... 8-37
Troubleshooting chart .................................................. 8-38VValve clearance ............................................................ 8-22
Vehicle identification number ....................................... 11-1WWheel hub bearings, checking ..................................... 8-30
Wheel, installing ........................................................... 8-36
Wheel, removing .......................................................... 8-36YYamalube ..................................................................... 8-14UBW463E0.book Page 2 Monday, January 28, 2019 10:22 AM