Yamaha YZF-R125 Service Manual page 27

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Timing chain
Model/number of links
Tensioning system
Rocker arm/rocker arm shaft
Rocker arm inside diameter
Limit
Rocker arm shaft outside diameter
Limit
Rocker-arm-to-rocker-arm-shaft clearance
Limit
Valve, valve seat, valve guide
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Valve head diameter A (intake)
Valve head diameter A (exhaust)
Valve face width B (intake)
Valve face width B (exhaust)
Valve seat width C (intake)
Limit
Valve seat width C (exhaust)
Limit
Valve margin thickness D (intake)
Valve margin thickness D (exhaust)
Valve stem diameter (intake)
Limit
Valve stem diameter (exhaust)
Limit
Valve guide inside diameter (intake)
Limit
Valve guide inside diameter (exhaust)
A
B
C
D
ENGINE SPECIFICATIONS
DID SCR-0404SV/96
Automatic
9.985–10.000 mm (0.3931–0.3937 in)
10.015 mm (0.3943 in)
9.966–9.976 mm (0.3924–0.3928 in)
9.941 mm (0.3914 in)
0.009–0.034 mm (0.0004–0.0013 in)
0.074 mm (0.0029 in)
0.10–0.14 mm (0.0039–0.0055 in)
0.20–0.24 mm (0.0079–0.0094 in)
19.40–19.60 mm (0.7638–0.7717 in)
16.90–17.10 mm (0.6654–0.6732 in)
1.538–2.138 mm (0.0606–0.0842 in)
1.538–2.138 mm (0.0606–0.0842 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.6 mm (0.06 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.6 mm (0.06 in)
0.50–0.90 mm (0.0197–0.0354 in)
0.50–0.90 mm (0.0197–0.0354 in)
4.475–4.490 mm (0.1762–0.1768 in)
4.445 mm (0.1750 in)
4.460–4.475 mm (0.1756–0.1762 in)
4.430 mm (0.1744 in)
4.500–4.512 mm (0.1772–0.1776 in)
4.550 mm (0.1791 in)
4.500–4.512 mm (0.1772–0.1776 in)
2-4