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TIPIf the specified free play cannot be obtained as de-
scribed above or if the clutch does not operate cor-
rectly, have a Yamaha dealer check the internal
clutch mechanism.EBU26864Drive chain slack The drive chain slack should be checked before
each ride and adjusted if necessary.
To check the drive chain slack1. Place the ATV on a level surface.TIPWhen checking and adjusting the drive chain
slack, there should be no weight on the ATV and
all tires must be touching the ground.2. Move the ATV back and forth to locate the tightest portion of the drive chain, and then
measure the drive chain slack as shown. 3. If the drive chain slack is incorrect, adjust it as
follows.
To adjust the drive chain slack 1. Place the ATV on a level surface.
2. Loosen the rear wheel axle pinch bolts.
3. Insert a rod of a diameter of 8 mm (0.3 in) and a length of 10 cm (4 in) into one of the holes in
the drive chain tensioner as shown.
Drive chain slack: 45.0 –55.0 mm (1.77 –2.17 in)
1. Drive chain slack
1
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EBU25961
SPECIFICATIONS
Dimensions:Overall length:1625 mm (64.0 in)
Overall width: 1072 mm (42.2 in)
Overall height:
1040 mm (40.9 in)
Seat height: 730 mm (28.7 in)
Wheelbase: 1110 mm (43.7 in)
Ground clearance:
100 mm (3.9 in)
Minimum turning radius: 2900 mm (114 in)Weight:With oil and fuel:
150.0 kg (331 lb)Noise and vibration level:Noise level (77/311/EEC):YFM25RB 81.0 dB(A)@3500 r/min
A-weighted sound power level:
YFM25RB 93.0 dB(A)@3500 r/min
Vibration on seat (EN1032, ISO5008): YFM25RB Will not exceed 0.5 m/s ²
Vibration on handlebar (EN1032, ISO5008): YFM25RB Will not exceed 2.5 m/s ²
Engine:Engine type:
Air cooled 4-stroke, SOHC
Cylinder arrangement: Forward-inclined single cylinder
Displacement:
249 cm ³
Bore × stroke:
74.0 × 58.0 mm (2.91 × 2.28 in)
Compression ratio: 9.50 : 1
Starting system:
Electric starter
Lubrication system: Wet sumpEngine oil:Recommended brand:
YAMALUBE
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Gear ratio:1st:
37/13 (2.846)
2nd: 33/18 (1.833)
3rd: 29/21 (1.381)
4th:
27/24 (1.125)
5th: 28/29 (0.966)Chassis:Frame type:
Steel tube frame
Caster angle: 6.0 °
Trail: 23.0 mm (0.91 in)Front tire:Type:Tubeless
Size: AT20 x 7-10
Manufacturer/model:
DUNLOP/KT201Rear tire:Type: Tubeless
Size:
AT19 x 10-9
Manufacturer/model: DUNLOP/KT205A
Loading:Maximum loading limit: 100.0 kg (220 lb)
(Total weight of rider, cargo, accessories, and tongue)Tire air pressure (measured on cold tires):Recommended:
Front:27.5 kPa (0.275 kgf/cm ², 4.0 psi)
Rear:
27.5 kPa (0.275 kgf/cm ², 4.0 psi)
Minimum: Front:
24.5 kPa (0.245 kgf/cm ², 3.6 psi)
Rear: 24.5 kPa (0.245 kgf/cm ², 3.6 psi)Front wheel:Wheel type:
Panel wheel
Rim size: 10 x 5.5ATRear wheel:Wheel type:
Panel wheel
Rim size: 9 x 8.0ATFront brake:Type:
Disc brake
Operation: Right hand operation
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