Suzuki DR 125, Service Manual

Page: 202 / 222

DR-Z125/LK6 (’06-MODEL) AND DR-Z125/LK7 (’07-MODEL) 9-3
SERVICE DATA
VALVE + GUIDE
Unit: mm (in)
ITEM STANDARD LIMIT
Valve diam.
IN.
30
(1.2)
—
EX.
26
(1.0)
—
Valve clearance (when cold)
IN.
0.08 – 0.13
(0.003 – 0.005)
—
EX.
0.13 – 0.18
(0.005 – 0.007)
—
Valve guide to valve stem
clearance
IN.
0.010 – 0.037
(0.0004 – 0.0015)
—
EX.
0.030 – 0.057
(0.0012 – 0.0022)
—
Valve guide I.D.
IN. & EX.
5.500 – 5.512
(0.2165 – 0.2170)
—
Valve stem O.D.
IN.
5.475 – 5.490
(0.2156 – 0.2161)
—
EX.
5.455 – 5.470
(0.2148 – 0.2154)
—
Valve stem deflection
IN. & EX. —
0.35
(0.014)
Valve stem runout
IN. & EX. —
0.05
(0.002)
Valve head thickness
IN. & EX. —
0.5
(0.014)
Valve stem end length
IN. & EX. —
2.5
(0.10)
Valve seat width
IN. & EX.
0.9 – 1.1
(0.035 – 0.043)
—
Valve head radial runout
IN. & EX. —
0.03
(0.001)
Valve spring free length
(IN. & EX.)
INNER —
36.0
(1.42)
OUTER —
39.3
(1.55)
Valve spring tension
(IN. & EX.)
INNER
76 – 90 N
(7.8 – 9.2 kgf, 17.2 – 20.3 lbs)
at length 32.5 mm (1.28 in)
—
OUTER
186 – 219 N
(18.9 – 22.3 kgf, 41.7 – 49.2 lbs)
at length 36.0 mm (1.42 in)
—