Yamaha YZF-R1 - Introduction

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1 Engine Specifications
Spec SBK STKSTD
Displacement 998 cm³ 998 cm³ 998 cm³
Bore/Stroke 78.0 x 52.2 mm 78.0 x 52.5 mm 78.0 x 52.2 mm
Maximum engine speed
(limiter controlled speed)
13800 rpm 13800 rpm 13800 rpm
Compression ratio
(recommended value)
13.7:1
(Depend of
head-gasket
and head
cylinder
thickness and
cylinder head
surface
grinding)
12.9:1
(Depending on
the thickness of
the head
gasket)
12.7:1
Valve timing (event angle) INT. 108°103°105°
EXT. 110°103°105°
Squish height (minimum) 0.65 mm 0.
65 mm 0.75 mm
Clearance between valve
and piston (minimum)
INT. 0.9 mm
(ATDC10°)
1.0 mm
(ATDC10°)
1.3 mm
(ATDC10°)
EXT. 1.8 mm
(BTDC10°)
2.5 mm
(BTDC10°)
2.8 mm
(BTDC10°)
Valve (tappet) clearance INT. 0.17 – 0.23 mm 0.11 – 0.20 mm 0.11 – 0.20 mm
EXT. 0.27 – 0.33 mm 0.21 – 0.25 mm 0.
21 – 0.25 mm