Yamaha XT660X Service Manual

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CHK
ADJ
ADJUSTING THE THROTTLE CABLE FREE PLAY/
CHECKING THE SPARK PLUG
c. Tighten the locknut.
WARNING
_
After adjusting the throttle cable free play,
start the engine and turn the handlebars to
the right and to the left to ensure that this
does not cause the engine idling speed to
change.
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EAS00060
CHECKING THE SPARK PLUG
1. Disconnect:
• spark plug cap
2. Remove:
• spark plug
CAUTION:
_
Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from fall-
ing into the cylinder.
3. Check:
• spark plug type
Incorrect → Change.
4. Check:
• electrode 1
Damage/wear → Replace the spark plug.
• insulator 2
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
• spark plug
(with a spark plug cleaner or wire brush)
Spark plug type (manufacturer)
CR7E (NGK)
6. Measure:
• spark plug gap a
(with a thickness gauge)
Out of specification → Regap.
Spark plug gap
0.7 ~ 0.8 mm (0.028 ~ 0.031 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