Yamaha YZF-R15, Service Manual

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2-5
Limit 0.080 mm
Valve-stem-to-valve-guide clearance (exhaust) 0.025–0.052 mm
Limit
0.100 mm
Valve stem runout 0.010 mm
Free length (intake) 41.71 mm
Limit 39.62 mm
Free length (exhaust) 41.71 mm
Limit 39.62 mm
Installed length (intake) 35.30 mm
Installed length (exhaust) 35.30 mm
Spring rate K1 (intake) 23.54 N/mm
Spring rate K2 (intake) 36.58 N/mm
Spring rate K1 (exhaust) 23.54 N/mm
Spring rate K2 (exhaust) 36.58 N/mm
Installed compression spring force (intake) 140–162 N
Installed compression spring force (exhaust) 140–162 N
Spring tilt (intake) 2.5°/1.8 mm
Spring tilt (exhaust) 2.5°/1.8 mm
Winding direction (intake) Clockwise
Winding direction (exhaust) Clockwise
Bore 56.985–57.010 mm
Taper limit 0.05 mm
Out of round limit 0.05 mm
Piston-to-cylinder clearance 0.020–0.045 mm
Limit 0.15 mm
Diameter D 56.965–56.990 mm
Valve spring
Cylinder
Piston
Height H mm
Offset mm
Offset direction Intake side
Piston pin bore inside diameter mm
Limit mm
Piston pin outside diameter mm
Limit mm
Piston pin to piston pin bore clearance mm
Limit mm
Top ring
Ring type Barrel
Dimensions B x T) 0.80 x 2.10 mm
End gap installed mm
Limit mm
Ring side clearance mm
Limit mm
nd ring
Ring type Taper
Dimensions B x T)
0.80 x 2.00 mm
End gap installed mm
Limit mm
Ring side clearance mm
Limit mm
Oil ring
Dimensions B x T) 1.50 x 1.52 mm
End gap installed mm
Ring side clearance mm
5.0
0.25
14.002 14.013
14.043
13.995 14.000
13.975
- - - - - 0.002 0.018
0.068
(
( ) 0.10 0.25
0.40
0.030 0.065
0.100
2
(
( ) 0.10 0.25
0.40
0.020 0.055
0.100
(
( ) 0.20 0.70
0.040 0.160
–
–
–
–
–
–
–
–
–
Piston ring
2-6
ENGINE SPECIFICATIONS
H
D
T
B
B
T
B
T