Yamaha XT660R S Service Manual

5 - 8
ENG
CYLINDER HEAD
EAS00221
CYLINDER HEAD
T
R
.
.
50 Nm (5.0 m
•
kg, 36 ft
•
Ib)
T
R
.
.
13 Nm (1.3 m
•
kg, 9.4 ft
•
Ib)
T
R
.
.
10 Nm (1.0 m
•
kg, 7.2 ft
•
Ib)
T
R
.
.
10 Nm (1.0 m
•
kg, 7.2 ft
•
Ib)
T
R
.
.
10 Nm (1.0 m
•
kg, 7.2 ft
•
Ib)
T
R
.
.
20 Nm (2.0 m
•
kg, 14 ft
•
Ib)
T
R
.
.
20 Nm (2.0 m
•
kg, 14 ft
•
Ib)
T
R
.
.
20 Nm (2.0 m
•
kg, 14 ft
•
Ib)
T
R
.
.
10 Nm (1.0 m
•
kg, 7.2 ft
•
Ib)
T
R
.
.
45 Nm (4.5 m
•
kg, 32 ft
•
Ib)
New
New
New
LS
New
New
New
New
LS
New
New
LS
New
New
E
1
2
5
4
6
8
7
9
10
11
3
3
(4)
3
12
(4)
3
E
E
Order Job/Part Q’ty Remarks
Removing the cylinder head
Remove the parts in the order listed.
Engine Refer to “ENGINE REMOVAL”.
Timing mark accessing screw/crank-
shaft end accessing screw
Refer to “ADJUSTING THE VALVE
CLEARANCE” in chapter 3.
1 Spark plug 1
2 Camshaft sprocket cover/O-ring 1/1
3 Tappet cover/O-ring 2/2
4 Air cut-off valve outlet pipe 1
5Gasket 1
6 Oil delivery pipe 1 1
7 Timing chain tensioner cap bolt 1
Refer to “REMOVING THE CYLINDER
HEAD” and “INSTALLING THE CYLIN-
DER HEAD”.
8 Timing chain tensioner/gasket 1/1
9 Camshaft sprocket 1
10 Cylinder head 1

Yamaha XT660R S Specifications

General

Displacement	660 cc
Bore x Stroke	100.0 mm x 84.0 mm
Compression Ratio	10.0:1
Fuel System	Fuel Injection
Ignition System	TCI
Starter System	Electric
Transmission System	5-speed
Final Drive	Chain
Front Suspension System	Telescopic forks
Front Tyre	90/90-21 M/C 54S
Rear Tyre	130/80-17 M/C 65S
Overall Width	865 mm
Overall Height	1, 230 mm
Seat Height	865 mm
Wheelbase	1, 505 mm
Wet Weight	181 kg
Fuel Tank Capacity	15 litres
Oil Tank Capacity	2.9 litres
Engine Type	Liquid-cooled, 4-stroke, single cylinder, SOHC
Maximum Power	48hp (35kW) @ 6, 000rpm
Frame	Steel diamond
Rear Suspension System	Swingarm, (link suspension)
Front Brake	Single 298mm disc, 2-piston caliper
Rear Brake	Single Disc, 245 mm