Yamaha YZF-R7 Owner's Service Manual page 45

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Item
Outer springs
Free length
Intake
Exhaust
Installed length (valve closed)
Intake
Exhaust
Compressed spring force
(installed)
Intake
Exhaust
Spring tilt
Intake
Exhaust
Winding direction (top view)
Intake
Exhaust
Cylinders
Cylinder arrangement
Bore × stroke
Compression ratio
Bore
Maximum taper
Maximum out of round
ENGINE SPECIFICATIONS
Standard
36.42 mm (1.43 in)
33.91 mm (1.34 in)
32.03 mm (1.26 in)
30.25 mm (1.19 in)
230 ~ 266 N
(23.45 ~ 27.12 kgf, 51.7 ~ 59.8 lb)
286 ~ 329 N
(29.16 ~ 33.55 kgf, 62.3 ~ 74.0 lb)
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Clockwise
Clockwise
Forward-inclined, parallel 4-cylinder
72 × 46 mm (2.83 × 1.81 in)
11.4:1
72.000 ~ 72.008 mm
(2.8346 ~ 2.8350 in)
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2 - 7
SPEC
Limit
34.60 mm
(1.36 in)
32.21 mm
(1.27 in)
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2.5˚ /1.6 mm
(2.5˚/0.063 in)
2.5˚ /1.5 mm
(2.5˚/0.059 in)
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0.05 mm
(0.0016 in)
0.05 mm
(0.0016 in)