Yamaha XT660X Service Manual

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ENG
TRANSMISSION
EAS00421
CHECKING THE SHIFT FORKS
The following procedure applies to all of the
shift forks.
1. Check:
• shift fork cam follower
1
• shift fork pawl
2
Bends/damage/scoring/wear
→
Replace
the shift fork.
2. Check:
• shift fork movement
Rough movement
→
Replace the shift
forks.
EAS00422
CHECKING THE SHIFT DRUM ASSEMBLY
1. Check:
• shift drum grooves
Damage/scratches/wear
→
Replace the
shift drum assembly.
• shift drum segment
1
Damage/wear
→
Replace the shift drum
assembly.
• shift drum bearing
2
Damage/pitting
→
Replace the shift drum
assembly.
EAS00425
CHECKING THE TRANSMISSION
1. Measure:
• main axle runout
(with a centering device and dial gauge
1
)
Out of specification
→
Replace the main
axle.
Main axle runout limit
0.08 mm (0.0031 in)

Yamaha XT660X Specifications

General

Displacement	660cc
Bore x Stroke	100.0 mm x 84.0 mm
Compression Ratio	10.0:1
Fuel System	Fuel Injection
Ignition System	TCI
Transmission	5-speed
Final Drive	Chain
Rear Brake	Single disc, Ø 245 mm
Front Tyre	120/70 R17
Rear Tyre	160/60 R17
Maximum Power	48 HP (35.3 kW) @ 6, 000 rpm
Maximum Torque	58.4Nm (43.1lb-ft) @ 5, 250rpm
Front Suspension	Telescopic fork
Rear Suspension	Swingarm, (link suspension)
Fuel Tank Capacity	15 litres
Engine Type	Liquid-cooled, 4-stroke, single cylinder, SOHC, 4-valves