Suzuki DF 40, Service Manual

Page: 378 / 405

DF40QH / DF50QH 7
VALVE / VALVE GUIDE
24.6 (0.9685) mm (in.) IN
Tappet clearance
(Cold engine
condition)
mm (in.)
Valve diameter
STD
STD mm (in.)
mm (in.) STD
Limit mm (in.)
0.045 – 0.072 (0.0018 – 0.0028) mm (in.) STD
Limit 0.090 (0.0035) mm (in.)
IN,EX
mm (in.) STD 5.500 – 5.512 (0.2165 – 0.2170)
Item Unit
Data
DF40QH DF50QH
21.5 (0.8465) mm (in.) EX
IN
EX
0.18 – 0.24 (0.007 – 0.009)
0.18 – 0.24 (0.007 – 0.009)
0.020 – 0.047 (0.0008 – 0.0019)
0.070 (0.0028)
IN
EX
Valve guide to
valve stem
clearance
Valve guide inside
diameter
Valve seat
angle
IN
EX
30
°
, 45
°
15
°
, 45
°
IN,EX
mm (in.) STD 11 (0.4331)
Valve guide
protrusion
Valve stem
outside diameter
mm (in.) STD
STD mm (in.)
IN
EX
5.465 – 5.480 (0.2152 – 0.2157)
5.440 – 5.455 (0.2142 – 0.2148)
IN,EX
mm (in.)
Limit
3.2 (0.1260)
Valve stem end
length
Valve stem end
deflection
mm (in.) Limit
Limit mm (in.)
IN
EX
0.14 (0.0055)
0.18 (0.0071)
IN,EX
mm (in.) Limit 0.05 (0.0020)
Valve stem runout
IN,EX
mm (in.) Limit 0.08 (0.0031)
Valve head radial
runout
Valve head
thickness
mm (in.) STD
Limit mm (in.)
IN
1.0 (0.0394)
0.7 (0.0276)
mm (in.) STD
Limit mm (in.)
EX
1.15 (0.0453)
0.5 (0.0197)
Valve seat
contact width
mm (in.) STD
STD
mm (in.)
IN
EX
1.80 – 2.20 (0.0709 – 0.0866)
1.65 – 2.05 (0.0650 – 0.0984)
Valve spring free
length
33.13 (1.3043) mm (in.) STD
31.80 (1.2520) mm (in.) Limit
Valve spring tension
95 – 111 (9.7–11.3, 21.4–24.9) for 28.5 mm (1.12 in.) N (kg, Ibs) STD
88 (8.9, 19.6) for 28.5 mm (1.12 in.) N (kg, Ibs) Limit
Valve spring
squareness
2.0 (0.079) mm (in.) Limit