Yamaha XT660X Service Manual

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ENG
CRANKSHAFT
EAS00388
REMOVING THE CRANKSHAFT
ASSEMBLY
1. Remove:
• crankshaft
1
NOTE:
_
• Remove the crankshaft with the crankcase
separating tool
2
.
• Make sure the crankcase separating tool is
centered over the crankshaft.
Crankcase separating tool
90890-01135
1
2
EAS00394
CHECKING THE CRANKSHAFT
1. Measure:
• big end side clearance
D
Out of specification → Replace the big end
bearing, crankshaft pin, or connecting rod.
2. Measure:
• crankshaft width A
Out of specification → Replace the crank-
shaft.
3. Measure:
• crankshaft runout C
Out of specification → Replace the crank-
shaft, bearing or both.
NOTE:
_
Turn the crankshaft slowly.
Big end side clearance
0.350 ~ 0.650 mm
(0.0138 ~ 0.0256 in)
Crankshaft width
74.95 ~ 75.00 mm
(2.9508 ~ 2.9528 in)
Maximum crankshaft runout
0.04 mm (0.0016 in)
D
C
C
A

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