Suzuki DF350A - Page 19

General Information: 0A-10
Valve / Valve Guide
Item Unit
Data
DF350AT
Valve diameter
IN mm (in.) 37.9 (1.49)
EX mm (in.) 31.4 (1.2)
Tappet clearance (Valve lash)
(Cold engine condition)
IN std. mm (in.) 0.23 – 0.27 (0.009 – 0.011)
EX std. mm (in.) 0.33 – 0.37 (0.013 – 0.015)
Valve seat angle
IN — 30°, 45°, 60°
EX — 30°, 45°, 60°
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.) 11.4 – 11.8 (0.45 – 0.46)
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 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.) 1.1 (0.04)
Limit mm (in.) 0.7 (0.03)
EX
std. mm (in.) 1.1 (0.04)
Limit mm (in.) 0.7 (0.03)
Valve seat contact width
IN std. mm (in.) 1.1 – 1.3 (0.04 – 0.05)
EX std. mm (in.) 1.1 – 1.2 (0.04 – 0.05)
Valve spring free length
std. mm (in.) 41.25 (1.62)
Limit mm (in.) 39.60 (1.56)
Valve spring preload
std. N (kg, lbs) 147 – 173 (14.7 – 17.3, 32.4 – 38.1) at 32.5 mm (1.28 in.)
Limit N (kg, lbs) 136 (13.6, 30.0) at 32.5 mm (1.28 in.)
Valve spring squareness Limit mm (in.) 2.0 (0.08)