Yamaha XT660R S 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 XT660R S Specifications

General

Displacement	660 cc
Bore x Stroke	100.0 mm x 84.0 mm
Compression Ratio	10.0:1
Fuel System	Fuel Injection
Ignition System	TCI
Starter System	Electric
Transmission System	5-speed
Final Drive	Chain
Front Suspension System	Telescopic forks
Front Tyre	90/90-21 M/C 54S
Rear Tyre	130/80-17 M/C 65S
Overall Width	865 mm
Overall Height	1, 230 mm
Seat Height	865 mm
Wheelbase	1, 505 mm
Wet Weight	181 kg
Fuel Tank Capacity	15 litres
Oil Tank Capacity	2.9 litres
Engine Type	Liquid-cooled, 4-stroke, single cylinder, SOHC
Maximum Power	48hp (35kW) @ 6, 000rpm
Frame	Steel diamond
Rear Suspension System	Swingarm, (link suspension)
Front Brake	Single 298mm disc, 2-piston caliper
Rear Brake	Single Disc, 245 mm