Yamaha YTZ250S 1986 Service Manual page 133

II. MAINTENANCE SPECIFICATIONS
A. Engine
Cylinder Head:
Warp Limit
Cylinder:
Bore Size
Taper Limit
Out of Round Limit
Piston :
Piston Size/
Measuring Point*
Piston Clearance
Oversize 1st
2nd
3rd
4th
Piston Offset
Piston Ring : Top Ring
Sectional Sketch
2nd Ring
End Gap (Installed)
Top/2nd Ring
Side Clearance (Installed)
Top Ring
2nd Ring
C ran I<shaft:
Crank Width "A"
Run Out Limit "C"
PJr.
F
---
A
Connecting Rod Big End Side Clearance "0"
Small End Free Play "F"
<Limit>
YTZ250S
<0.03 mm (0.0012 in) >
*Lines indicate straightedge measurement.
68.8020 mm (2.68 +g ooos in)
<0.05 mm ('0.002 in) >
<0.01 mm (0.0004 in) >
68
goo
mm (2.68 goo2 in) / 10 mm (0 .394 in)
0.060-0.065 mm (0.0024-0.0026 in)
68.25 mm (2 .69 in)
68.50 mm (2.70 in)
68.75 mm (2.71 in)
69.00 mm (2.72 in)
1.5 mm (0 .059 in), EX-side
Keystone
B
=
1.2 mm (0.047 in)
T
=
2.8 mm (0.110 in)
Keystone
B
=
1.2 mm (0.047 in)
T
=
2.8 mm (0 .110 in)
0.35-0.50 mm (0.014-0.020 in)
0.03 - 0.05 mm (0.001 - 0.002 in)
0.03 - 0.05 mm (0.001 - 0.002 in)
62J05 mm (2.44 JOO2 in)
<0.03 mm (0.0012 in) >
0.25-0.75 mm (0.0098-0.0295 in)
0.4-1.0 mm (0.016-0.04 in)
<2.0 mm (0.08 in) >
6-9