Yamaha R1 Series 2015 Service Manual page 79

Valve head diameter (exhaust)
Valve seat contact width (intake)
Limit
Valve seat contact width (exhaust)
Limit
Valve stem diameter (intake)
Limit
Valve stem diameter (exhaust)
Limit
Valve guide inside diameter (intake)
Limit
Valve guide inside diameter (exhaust)
Limit
Valve-stem-to-valve-guide clearance (intake)
Limit
Valve-stem-to-valve-guide clearance (ex-
haust)
Limit
Valve stem runout
Valve spring
Free length (intake)
Limit
Free length (exhaust)
Limit
Installed length (intake)
Installed length (exhaust)
Installed compression spring force (intake)
Installed compression spring force (exhaust)
Spring tilt (intake)
Spring tilt (exhaust)
Winding direction (intake)
Winding direction (exhaust)
Cylinder
Bore
Taper limit
Out of round limit
Piston
Piston-to-cylinder clearance
Diameter
Measuring point (from piston skirt bottom)
Offset
Piston pin bore inside diameter
Limit
Piston pin outside diameter
Limit
Piston-pin-to-piston-pin-bore clearance
Limit
Piston ring
Top ring
ENGINE SPECIFICATIONS
26.40–26.60 mm (1.0394–1.0472 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.6 mm (0.06 in)
1.10–1.30 mm (0.0433–0.0512 in)
1.8 mm (0.07 in)
4.975–4.990 mm (0.1959–0.1965 in)
4.960 mm (0.1953 in)
4.460–4.475 mm (0.1756–0.1762 in)
4.425 mm (0.1742 in)
5.000–5.012 mm (0.1969–0.1973 in)
5.050 mm (0.1988 in)
4.500–4.512 mm (0.1772–0.1776 in)
4.550 mm (0.1791 in)
0.010–0.037 mm (0.0004–0.0015 in)
0.080 mm (0.0032 in)
0.025–0.052 mm (0.0010–0.0020 in)
0.100 mm (0.0039 in)
0.010 mm (0.0004 in)
40.67 mm (1.60 in)
38.64 mm (1.52 in)
42.37 mm (1.67 in)
40.25 mm (1.58 in)
35.40 mm (1.39 in)
36.60 mm (1.44 in)
171.40–197.20 N (17.48–20.11 kgf, 38.53–
44.33 lbf)
198.80–228.80 N (20.27–23.33 kgf, 44.69–
51.43 lbf)
1.8 mm (0.07 in)
1.8 mm (0.07 in)
Clockwise
Clockwise
79.000–79.010 mm (3.1102–3.1106 in)
0.050 mm (0.0020 in)
0.050 mm (0.0020 in)
0.006–0.049 mm (0.0002–0.0019 in)
78.961–79.994 mm (3.1087–3.1494 in)
8.0 mm (0.31 in)
0.10 mm (0.0039 in)
17.002–17.013 mm (0.6694–0.6698 in)
17.043 mm (0.6710 in)
16.991–17.000 mm (0.6689–0.6693 in)
16.971 mm (0.6681 in)
0.002–0.022 mm (0.0001–0.0009 in)
0.072 mm (0.0028 in)
2-4