Yamaha YZF-R1 98 Service Manual page 26

Item
Valve springs
Free length
Intake
Exhaust
Installed length (valve closed)
Intake
Exhaust
Com pressed spring force
(installed)
Intake
Exhaust
Spring tilt
Intake
Exhaust
Winding direction (top view )
Intake
Exhaust
Cylinders
Cylinder arrangem ent
Bore × stroke
Com pression ratio
Bore
M ax. taper
M ax. out-of-round
ENGINE SPECIFICATIONS
Standard
38.9 m m
40.67 m m
34.5 m m
35 m m
82 ~ 96 N (8.36 ~ 9.79 kgf)
110 ~ 126 N (11.22 ~ 12.85 kgf)
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Clockw ise
Clockw ise
Forw ard-inclined, parallel 4-cylinder
74 × 58 m m
11.8:1
74.00 ~ 74.010 m m
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2 - 6
SPEC
Lim it
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2.5˚ /
1.7 m m
2.5˚ /
1.8 m m
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0.05 m m
0.05 m m