Yamaha XT660R S Service Manual

5 - 72
ENG
CRANKCASE
SEPARATING THE CRANKCASE
1. Separate:
• right crankcase 1
• left crankcase 2
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a. Remove the crankcase bolts.
NOTE:
_
• Loosen each bolt 1/4 of a turn at a time and
after all the bolts are loosened, remove
them.
• Loosen the bolts in stages, using a criss-
cross pattern.
b. Remove the right crankcase.
NOTE:
_
Insert a screwdriver or pry bar into the pry
points in the crankcase and then carefully pry
apart the crankcase halves.
CAUTION:
_
Use a soft hammer to tap on one side of the
crankcase. Tap only on reinforced portions
of the crankcase. Do not tap on the crank-
case mating surfaces. Work slowly and
carefully. Make sure that the crankcase
halves separate evenly.
c. Remove the dowel pins and O-ring.
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1
2
CHECKING THE OIL STRAINER AND OIL
DELIVERY PIPE 3
1. Check:
• oil strainer
Damage → Replace.
Contaminants → Clean with engine oil.

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