Yamaha XS650SE, Shop Manual, Page: 155 / 215

Valve stem diameter IN: 8.0 mm (0.315 in)
EX: 8.0 mm (0.315 in)
Valve guide diameter
mm (0.315 in)
Valve stem to guide clearance
IN: 0.020 0.044 mm (0.00079 0.00173 in)
EX: 0.035 0.059 mm (0.00138 0.00232 in)
10. VALVE SPRING
1) Free length
INNER 42 mm (1.654 in)
OUTER 42.55 mm (1.675 in)
2) Spring rate
INNER = 1.43 kg/mm (80.1 lb/in)
= 1.81 kg/mm (101.4 lb/in
OUTER = 3.2 kg/mm (179.2 lb/in)
= 4.18 lb/in)
3) Installed length (Valve closed)
INNER 35 mm (1.378 in)
OUTER 37 mm (1.457 in)
4) Installed pressure (Valve closed)
INNER 10 kg (22.0 1.5 lb)
OUTER 17.7 1.25 kg (39.0 2.8 lb)
5) Compressed length (Valve open)
INNER 25.5 mm (1.004 in)
OUTER 27.5 mm (1.083 in)
6) Compressed pressure (Valve open)
INNER 27.2 1.9 kg (60.0 4.2 lb)
OUTER 57.4 kg (126.5 8.8 lb)
7) Wire diameter
INNER 2.9 mm (0.114 in)
OUTER 4.2 mm (0.165 in)
8) Winding D.D.
INNER 19.4 mm (0.764 in)
OUTER 32.6 mm (1.283 in)
9) Number of windings
INNER 6.0 turns
OUTER 4.25 turns
Crankshaft deflection limit (A) 0.05 mm (0.002 in)
2) Con-rod large end clearance 0.15 0.4 mm (0.0059 0.0157 in)
3) Width of crankshaft
(C)
mm (2.598 in)
(D) mm (7.323 in)
4) Crank pin I.D. 26 mm (1.024 in)
5) Crank pin O.D. length
28 x 65 mm
0
(1.024 x
12. CONNECTING ROD
end I.D.
34 mm (1.339 in)
2) Small end I.D.
20 mm (0.787 in)
13. CRANK BEARING
Type Right end
Others
2) Oil seal type
SD-2540-9
_ on