Yamaha XT660X Service Manual

5 - 12
ENG
CYLINDER HEAD
EAS00212
CHECKING THE TAPPET COVERS AND
CAMSHAFT SPROCKET COVER
1. Check:
• tappet covers
1
• camshaft sprocket cover
2
• O-rings
3
Damage/wear
→
Replace the defective
part(s).
2
1
3
3
EAS00210
CHECKING THE TIMING CHAIN
TENSIONER
1. Check:
• timing chain tensioner
Cracks/damage
→
Replace.
2. Check:
• one-way cam operation
Rough movement
→
Replace the timing
chain tensioner housing.
3. Check:
• timing chain tensioner cap bolt
• copper washer
• spring
• one-way cam
• gasket
• timing chain tensioner rod
Damage/wear
→
Replace the defective
part(s).
New
New
CHECKING THE CAMSHAFT SPROCKET
1. Check:
• camshaft sprocket
Wear/damage
→
Replace the camshaft
sprocket and timing chain as a set.
a 1/4 of a tooth
b Correct
1 Roller
2 Sprocket
EAS00231
INSTALLING THE CYLINDER HEAD
1. Install:
• dowel pins
• cylinder head gasket
New

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