Suzuki DF2.5 Service Manual page 165

6 DF2.5 (Serial No. 21 0001 and later)
Item
Unit
Data
DF2.5
VALVENALVE GUIDE
Valve diameter IN mm (in) 20.0 (0.79)
EX
mm (in) 18.0 (0.71)
Valve
IN
STD
mm (in) 0.13- 0.17 (0.005 - 0.007)
clearance
(Cold engine
EX STD
mm (in) 0.13- 0.17 (0.005 - 0.007)
Valve seat angle IN
-
45°
EX
- 45°
Valve guide
IN
STD
mm (in) 0.010 - 0.037 (0.0004- 0.0015)
to valve stem
Limit nim (in) 0.075 (0.0030)
clearance
STD
mm (in)
.
0.025 - 0.052 (0.001 0- 0.0020)
EX
Limit mm (in) 0.090 (0.0035)
Valve guide
IN,
inside
EX
STD
mm (in) 4.000-4.012 (0.1575- 0.1580)
diameter
Valve stem
IN
STD
mm (in)
3.975- 3.990 (0.1565 - 0.1571)
outside
diameter
EX STD
mm (in) 3.960-3.975 (0.1559- 0.1565)
Valve stem IN,
Limit mm (in) 0.35 (0.014)
deflection
EX
Valve stem IN,
Limit mm (in) 0.05 (0.002)
run out
EX
Valve head IN,
Limit mm (in) 0.08 (0.003)
radial runout
EX
Valve head IN,
Limit mm (in) 0.5 (0.02)
thickness
EX
Valve seat IN,
STD
mm (in) 0.8- 1.0 (0.03- 0.04)
contact width
EX
Valve spring free
STD
mm (in)
22.8 (0.90)
length
Limit mm (in) 21.9 (0.86)
Valve spring tension
STD
N (kg, lbs) 36.05- 42.85 (3.61 - 4.29, 8.0- 9.5) for 16.9 mm (0.67 in)
Limit N (kg, lbs) 33.53 (3.35, 7.39) for 16.9 mm (0.67 in)