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Yamaha XT660X Service Manual

Yamaha XT660X
462 pages
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ENG
CHAPTER 5
ENGINE
ENGINE REMOVAL
........................................................................................5-1
EXHAUST PIPES AND MUFFLERS .........................................................5-1
LEADS, CABLES, HOSES, AND IGNITION COIL ....................................5-2
ENGINE.....................................................................................................5-5
INSTALLING THE ENGINE.......................................................................5-7
CYLINDER HEAD
............................................................................................5-8
REMOVING THE CYLINDER HEAD.......................................................5-10
CHECKING THE CYLINDER HEAD .......................................................5-11
CHECKING THE TAPPET COVERS AND CAMSHAFT SPROCKET
COVER...................................................................................................5-12
CHECKING THE TIMING CHAIN TENSIONER......................................5-12
CHECKING THE CAMSHAFT SPROCKET............................................5-12
INSTALLING THE CYLINDER HEAD .....................................................5-12
ROCKER ARMS AND CAMSHAFT
..............................................................5-16
REMOVING THE ROCKER ARMS AND CAMSHAFT............................5-18
CHECKING THE CAMSHAFT.................................................................5-18
CHECKING THE DECOMPRESSION SYSTEM.....................................5-19
CHECKING THE ROCKER ARMS AND ROCKER ARM SHAFTS ........5-20
INSTALLING THE CAMSHAFT AND ROCKER ARMS ..........................5-21
VALVES AND VALVE SPRINGS
..................................................................5-23
REMOVING THE VALVES......................................................................5-24
CHECKING THE VALVES AND VALVE GUIDES ..................................5-25
CHECKING THE VALVE SEATS ............................................................5-27
CHECKING THE VALVE SPRINGS........................................................5-29
INSTALLING THE VALVES ....................................................................5-30
CYLINDER AND PISTON
..............................................................................5-32
REMOVING THE CYLINDER AND PISTON...........................................5-34
CHECKING THE CYLINDER AND PISTON ...........................................5-34
CHECKING THE PISTON RINGS...........................................................5-36
CHECKING THE PISTON PIN ................................................................5-37
INSTALLING THE PISTON AND CYLINDER .........................................5-38

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Yamaha XT660X Specifications

General IconGeneral
Displacement660cc
Bore x Stroke100.0 mm x 84.0 mm
Compression Ratio10.0:1
Fuel SystemFuel Injection
Ignition SystemTCI
Transmission5-speed
Final DriveChain
Rear BrakeSingle disc, Ø 245 mm
Front Tyre120/70 R17
Rear Tyre160/60 R17
Maximum Power48 HP (35.3 kW) @ 6, 000 rpm
Maximum Torque58.4Nm (43.1lb-ft) @ 5, 250rpm
Front SuspensionTelescopic fork
Rear SuspensionSwingarm, (link suspension)
Fuel Tank Capacity15 litres
Engine TypeLiquid-cooled, 4-stroke, single cylinder, SOHC, 4-valves

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