Yamaha XS650G 1978, Supplementary Service Manual

Page: 17 / 29

9. VALVE, VALVE SEAT AND VALVE GUIDE
1) Valve per cylinder
2) Valve clearance cold engine)
3) Dimensions
Valve head diameter “A”
Valve face width “6”
Valve seat width “C”
Valve margin thickness “D”
Valve stem diameter
Valve guide diameter
Valve stem to guide clearance
4) Valve face runout limit
0. VALVE SPRING
1)
Free length
Spring rate
3) Installed length (Valve closed)
41 Installed pressure (Valve closed)
5) Compressed length (Valve open)
6) Compressed pressure (Valve open)
7) Wire diameter
8) Winding O.D.
91 Number of windings
2 pcs.
IN: 0.06 mm (0.0024 in)
EX: 0.15 mm (0.0059 in)
EX: 1.3 mm (0.051 in)
IN: 1.3 mm (0.051 in)
EX: 1.3 mm (0.051 in)
IN: 41 mm (1.614 in)
EX: 35 mm (1.378 in)
IN: 2.1 mm (0.083 in)
EX: 2.1 mm (0.083 in)
IN: 1.3 mm (0.051 in)
IN: mm in)
mm in)
IN: mm (0.315 in)
EX: mm (0.315
IN: 0.034 mm 0.00173 in)
EX: 0.035 0.059 mm 10.00138 0.00232
IN EX: 0.03 mm 10.0012 in) or less
INNER 42 mm (1.654 in)
42.55 mm (1.675 in)
INNER 1.43 kg/mm 180.1 lb/in)
1.81 1101.4
3.2 kg/mm (179.2 lb/in)
4.18 kg/mm (234.1
INNER 35 mm 11.378 in)
37 mm 11.457 in)
INNER 10 0.7 kg (22.0 1.5 lb)
17.7 1.25 kg (39.0 2.8 lb)
INNER 25.5 mm (1.004 in)
27.5 mm (1.083 in)
INNER 27.2 1.9 kg (60.0 4.2 lb)
57.4 f4.0 kg (126.5 8.8 lb)
INNER (0.114 in)
4.2 mm in)
INNER 19.4 mm (0.764 in)
32.6 mm (1.283 in)
INNER 6.0 turns
4.25 turns