Yamaha XT660X 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 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