Yamaha MX400 - Page 12

2-3
SPEC
MAINTENANCE SPECIFICATIONS
Model name:
MZ400 MX400
Model code number:
7HSB 7HSJ
Piston: mm (in)
Piston clearance
0.015–0.029 (0.0006–0.0011)
<Limit>
0.06 (0.0024)
Piston skirt diameter “D”
84.977–84.998 (3.3455–3.3464)
<Limit>
84.921 (3.3433)
Measuring point “H”
10 (0.3937)
Oversize 1st
85.25 (3.3563)
2nd
85.5 (3.3661)
Piston pin hole inside diameter
20.004–20.015 (0.7876–0.7880)
<Limit>
20.045 (0.7892)
Piston pin: mm (in)
Piston pin diameter
19.995–20.000 (0.7872–0.7874)
<Limit>
19.975 (0.7864)
Piston ring: mm (in)
Top ring
Type
Barrel
Dimensions “B × T”
1.2 × 3.1 (0.0472 × 0.1220)
End gap
0.20–0.35 (0.0079–0.0138)
<Limit>
0.6 (0.0236)
Side clearance
0.04–0.08 (0.0016–0.0031)
<Limit>
0.13 (0.0051)
2nd ring
Type
Taper
Dimensions “B × T”
1.2 × 3.2 (0.0472 × 0.1260)
End gap
0.30–0.45 (0.0118–0.0177)
<Limit>
0.8 (0.0315)
Side clearance
0.03–0.07 (0.0012–0.0028)
<Limit>
0.13 (0.0051)
Oil ring
Type
3-piece type
Dimensions “B × T”
2.5 × 2.5 (0.0984 × 0.0984)
End gap
0.2–0.7 (0.0079–0.0276)
Cylinder head: mm (in)
Warpage limit
0.05 (0.002)
Cylinder: mm (in)
85.000–85.020 (3.3465–3.3472)
Inside diameter “D”
<Limit>
85.04 (3.348)
Taper limit
0.05 (0.002)
Warpage limit
0.05 (0.002)
MAINTENANCE SPECIFICATIONS
ENGINE
B
T