Yamaha MZ250 2012 Supplementary Service Manual page 26

Model name:
Model code number:
Valve:
Head diameter "A"
Stem diameter "B"
<Limit>
Stem length "C"
Valve face contact width "D"
<Limit>
Valve seat contact width
<Limit>
Valve seat width
Valve margin thickness
Valve stem runout limit
"θ"
Valve guide
Guide inside diameter
Stem to guide clearance
Valve clearance (cold)
Push rod:
Runout limit
MAINTENANCE SPECIFICATIONS
mm (in)
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
mm (in)
4-5
MZ250
7KBJ 7KBN
27.9–28.1
(1.0984–1.1063)
26.9–27.1
(1.0591–1.0669)
5.948–5.963 (0.2342–0.2348)
5.940–5.955 (0.2339–0.2344)
5.918 (0.2330)
5.910 (0.2327)
90.5 (3.563)
91.1 (3.5866)
0.7–0.9 (0.0276–0.0354)
0.7–0.9 (0.0276–0.0354)
1.6 (0.063)
1.6 (0.063)
0.7–0.9 (0.0276–0.0354)
0.7–0.9 (0.0276–0.0354)
1.6 (0.063)
1.6 (0.063)
0.7–0.9 (0.0276–0.0354)
0.7–0.9 (0.0276–0.0354)
1.0–1.4 (0.0394–0.0551)
1.0–1.4 (0.0394–0.0551)
0.01 (0.0004)
90°
6.000–6.012 (0.2362–0.2367)
6.000–6.012 (0.2362–0.2367)
0.037–0.064 (0.0015–0.0025)
0.045–0.072 (0.0018–0.0028)
0.08–0.12 (0.0031–0.0047)
0.08–0.12 (0.0031–0.0047)
0.15 (0.0059)
SPEC
MZ300
7VBJ 7VBN
31.9–32.1
(1.2559–1.2638)
28.9–29.1
(1.1378–1.1457)
90.0 (3.5433)
90.3 (3.5551)