Yamaha YZF-R1, Kit Manual

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Engine Specifications
Spec SBK/JSB STK STD
Displacement 998cm
3
998cm
3
998cm
3
Bore/Stroke 79.0 × 50.9 mm 79.0 × 50.9 mm 79.0 × 50.9 mm
Maximum engine speed
(limiter controlled speed) 14500 rpm 14500 rpm 14500 rpm
Compression ratio
(recommended value) 13.0 – 13.4
Depending on
head surface
grinding 13.0 13.0
Valve timing (event angle) INT 105° 108° 108°
EXT 108° 110° 110°
Clearance between valve
and piston (minimum) INT 0.95 mm – –
EXT 1.90 mm – –
Valve (tappet) clearance INT 0.09 – 0.17 mm 0.09 – 0.17 mm 0.09 – 0.17 mm
EXT 0.18 – 0.23 mm 0.18 – 0.23 mm 0.18 – 0.23 mm