Maintenance Specifications; Engine - Yamaha MX250 Service Manual

MAINTENANCE SPECIFICATIONS

MAINTENANCE SPECIFICATIONS

ENGINE

Piston:
Piston-to-cylinder clearance
Limit
Piston diameter
Limit
Measuring point (from piston
skirt bottom)
Oversize 1st
2nd
Piston pin hole inside diameter
Limit
Piston pin:
Piston pin diameter
Limit
Piston ring:
Top ring
Type
Dimensions
End gap (installed)
Limit
Side clearance
Limit
2nd ring
Type
Dimensions
End gap (installed)
Limit
Side clearance
Limit
Oil ring
Type
Dimensions
End gap (installed)
Cylinder head:
Warpage limit
Cylinder:
Bore
0.033–0.047 mm (0.0012–0.0018 in)
0.06 mm (0.0024 in)
79.96–79.98 mm (3.1480–3.1488 in)
79.91 mm (3.1461 in)
10.0 mm (0.3937 in)
80.25 mm (3.1594 in)
80.50 mm (3.1692 in)
19.004–19.015 mm (0.7481–0.7486 in)
19.045 mm (0.7498 in)
18.995–19.000 mm (0.7478–0.7480 in)
18.975 mm (0.7470 in)
Barrel
1.2  2.9 mm (0.0472  0.1141 in)
0.20–0.35 mm (0.0079–0.0138 in)
0.60 mm (0.0236 in)
0.03–0.05 mm (0.0011–0.0019 in)
0.10 mm (0.0039 in)
Taper
1.2  3.2 mm (0.0472  0.1260 in)
0.20–0.35 mm (0.0079–0.0138 in)
0.70 mm (0.0275 in)
0.02–0.04 mm (0.0007–0.0015 in)
0.10 mm (0.0039 in)
3-piece type
2.5  2.5 mm (0.0984  0.0984 in)
0.20–0.70 mm (0.0079–0.0276 in)
0.05 mm (0.002 in)
80.000–80.020 mm (3.1496–3.1503 in)
7-3
1
2
3
4
5
6
7
8
9
10