Yamaha MX400 - Page 14

2-5
SPEC
MAINTENANCE SPECIFICATIONS
Model name:
MZ400 MX400
Model code number:
7HSB 7HSJ
Valve: mm (in)
Head diameter “A” IN
31.9–32.1 (1.2559–1.2638)
EX
27.9–28.1 (1.0984–1.1063)
Stem diameter “B” IN
5.948–5.963 (0.2342–0.2348)
EX
5.940–5.955 (0.2339–0.2344)
<Limit> IN
5.918 (0.2330)
EX
5.910 (0.2327)
Stem length “C” IN
88.1 (3.4685)
EX
88.1 (3.4685)
Valve face contact width “D”
IN
0.7–0.9 (0.0276–0.0354)
EX
0.7–0.9 (0.0276–0.0354)
<Limit> IN
1.6 (0.063)
EX
1.6 (0.063)
Valve seat contact width IN
0.7–0.9 (0.0276–0.0354)
EX
0.7–0.9 (0.0276–0.0354)
<Limit> IN
1.6 (0.063)
EX
1.6 (0.063)
Valve seat width IN
0.7–0.9 (0.0276–0.0354)
EX
0.7–0.9 (0.0276–0.0354)
Valve margin thickness IN
1.0–1.4 (0.0394–0.0551)
EX
1.0–1.4 (0.0394–0.0551)
Valve stem runout limit
0.01 (0.0004)
“θ”
90°
Valve guide
Guide inside diameter IN
6.000–6.012 (0.2362–0.2367)
EX
6.000–6.012 (0.2362–0.2367)
Stem to guide clearance IN
0.037–0.064 (0.0015–0.0025)
EX
0.045–0.072 (0.0018–0.0028)
Valve clearance (cold) IN
0.08–0.12 (0.0031–0.0047)
EX
0.08–0.12 (0.0031–0.0047)
Push rod: mm (in)
Runout limit
0.15 (0.0059)