Maintenance Specifications; Engine - Yamaha MZ250 2012 Supplementary Service Manual

MAINTENANCE SPECIFICATIONS

ENGINE

Model name:
Model code number:
Piston:
Piston clearance
<Limit>
Piston skirt diameter "D"
<Limit>
Measuring point "H"
Oversize 1st
2nd
Piston pin hole inside diameter
<Limit>
Piston pin:
Piston pin diameter
<Limit>
Piston ring:
Top ring
Type
Dimensions "B × T"
End gap
<Limit>
Side clearance
<Limit>
2nd ring
Type
Dimensions "B × T"
End gap
<Limit>
Side clearance
<Limit>
Oil ring
Type
Dimensions "B × T"
End gap
Cylinder head:
Warpage limit
MAINTENANCE SPECIFICATIONS
mm (in)
mm (in)
mm (in)
B
T
mm (in)
4-3
MZ250
7KBJ 7KBN
0.023–0.037
(0.0009–0.0015)
0.05 (0.0020)
73.97–73.99
(2.9122–2.9130)
73.92 (2.910)
10 (0.4)
74.25 (2.9232)
74.5 (2.9331)
19.004–19.015 (0.7482–0.7486)
19.045 (0.7498)
18.995–19.000 (0.7478–0.7480)
18.975 (0.7470)
Barrel
1.2 × 2.8
(0.0472 × 0.1102)
0.15–0.30
(0.0059–0.0118)
0.55 (0.0217)
0.04–0.08 (0.0016–0.0031)
0.13 (0.0051)
Taper
1.2 × 3.0
(0.0472 × 0.1181)
0.15–0.30
(0.0059–0.0118)
0.65 (0.0256)
0.03–0.07 (0.0012–0.0028)
0.13 (0.0051)
3-piece type
2.5 × 2.5 (0.0984 × 0.0984)
0.2–0.7 (0.0079–0.0276)
0.05 (0.002)
SPEC
MZ300
7VBJ 7VBN
0.033–0.047
(0.0013–0.0019)
0.06 (0.0024)
79.960–79.980
(3.1480–3.1488)
79.91 (3.146)
80.25 (3.1594)
80.5 (3.1693)
1.2 × 2.9
(0.0472 × 0.1142)
0.20–0.35
(0.0079–0.0138)
0.6 (0.0236)
1.2 × 3.2
(0.0472 × 0.1260)
0.20–0.35
(0.0079 × 0.0138)
0.7 (0.0276)