Yamaha YZF-R1S Service Manual page 33

Item
Timing chain
Model/number of links
Tensioning system
Valves, valve seats, valve guides
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Head Diameter
Valve head diameter A
Intake
Exhaust
Valve face width B
Intake
Exhaust
Valve seat width C
Intake
Exhaust
Valve margin thickness D
Intake
Exhaust
Valve stem diameter
Intake
Exhaust
Valve guide inside diameter
Intake
Exhaust
Valve-stem-to-valve-guide clearance
Intake
Exhaust
Valve stem runout
Valve seat width
Intake
Exhaust
ENGINE SPECIFICATIONS
RH2020 /122
Automatic
0.11 X 0.20 mm (0.0043 X 0.0079 in)
0.21 X 0.25 mm (0.0083 X 0.0098 in)
Face Width
23.4 X 23.6 mm (0.9213 X 0.9291 in)
24.9 X 25.1 mm (0.9803 X 0.9882 in)
1.76 X 2.90 mm (0.0693 X 0.1142 in)
1.76 X 2.90 mm (0.0693 X 0.1142 in)
0.9 X 1.1 mm (0.0354 X 0.0433 in)
0.9 X 1.1 mm (0.0354 X 0.0433 in)
0.5 X 0.9 mm (0.0197 X 0.0354 in)
0.5 X 0.9 mm (0.0197 X 0.0354 in)
3.975 X 3.990 mm (0.1565 X 0.1571 in)
4.460 X 4.475 mm (0.1756 X 0.1762 in)
4.000 X 4.012 mm (0.1575 X 0.1580 in)
4.500 X 4.512 mm (0.1772 X 0.1776 in)
0.010 X 0.037 mm (0.0004 X 0.0015 in)
0.025 X 0.052 mm (0.0010 X 0.0020 in)
SSS
0.9 X 1.1 mm (0.0354 X 0.0433 in)
0.9 X 1.1 mm (0.0354 X 0.0433 in)
2-5
Standard
Seat Width
SPEC
Limit
SSS
SSS
SSS
SSS
Margin Thickness
SSS
SSS
SSS
SSS
1.6 mm (0.06 in)
1.6 mm (0.06 in)
0.5 mm (0.02 in)
0.5 mm (0.02 in)
3.945 mm
(0.1553 in)
4.425 mm
(0.1742 in)
4.050 mm
(0.1594 in)
4.550 mm
(0.1791 in)
0.08 mm
(0.0032 in)
0.10 mm
(0.0039 in)
0.01 mm
(0.0004 in)
1.6 mm (0.06 in)
1.6 mm (0.06 in)