Yamaha XT660R S 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 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