Suzuki DF 40 - Page 355

8 DF40/50 “K7” (’07) MODEL
VALVE/VALVE GUIDE
Item Unit
Data
DF40 DF50
Valve diameter IN mm (in) 24.6 (0.97)
EX mm (in) 21.5 (0.85)
Tappet clearance
(Cold engine
condition)
IN STD mm (in) 0.18 – 0.24 (0.007 – 0.009)
EX STD mm (in) 0.18 – 0.24 (0.007 – 0.009)
Valve seat angle IN — 30°, 45°
EX — 15°, 45°
Valve guide to valve
stem clearance
IN
STD mm (in) 0.020 – 0.047 (0.0008 – 0.0019)
Limit mm (in) 0.070 (0.0028)
EX
STD mm (in) 0.045 – 0.072 (0.0018 – 0.0028)
Limit mm (in) 0.090 (0.0035)
Valve guide inside
diameter
IN,
EX
STD mm (in) 5.500 – 5.512 (0.2165 – 0.2170)
Valve guide
protrusion
IN,
EX
STD mm (in) 11.0 (0.43)
Valve stem outside
diameter
IN STD mm (in) 5.465 – 5.480 (0.2152 – 0.2157)
EX STD mm (in) 5.440 – 5.455 (0.2142 – 0.2148)
Valve stem end length IN,
EX
Limit mm (in) 3.20 (0.126)
Valve stem end
deflection
IN Limit mm (in) 0.14 (0.006)
EX Limit mm (in) 0.18 (0.007)
Valve stem runout IN,
EX
Limit mm (in) 0.05 (0.002)
Valve head radial
runout
IN,
EX
Limit mm (in) 0.08 (0.003)
Valve head thickness
IN
STD mm (in) 1.0 (0.04)
Limit mm (in) 0.7 (0.03)
EX
STD mm (in) 1.15 (0.045)
Limit mm (in) 0.5 (0.02)
Valve seat contact
width
IN STD mm (in) 1.80 – 2.20 (0.071 – 0.087)
EX STD mm (in) 1.65 – 2.05 (0.065 – 0.081)
Valve spring free length STD mm (in) 33.1 (1.30)
Limit mm (in) 31.8 (1.25)
Valve spring tension STD N (kg, lbs) 97 – 113 (9.7 – 11.3, 21.4 – 24.9) for 28.5 mm (1.12 in)
Limit N (kg, lbs) 89 (8.9, 19.6) for 28.5 mm (1.12 in)
Valve spring sequareness Limit mm (in) 2.0 (0.08)