Suzuki DF 25, Service Manual, Page: 16 / 148

1-12 GENERAL INFORMATION
CYLINDER/PISTON/PISTON RING
Item Unit
Data
DF2.5
Cylinder distortion Limit mm (in) 0.05 (0.002)
Piston to cylinder
clearance STD mm (in) 0.018 – 0.033 (0.0007 – 0.0013)
Limit mm (in) 0.100 (0.0039)
Cylinder bore STD mm (in) 48.000 – 48.015 (1.8898 – 1.8904)
Cylinder measuring
position
mm (in) 20 (0.8) from cylinder top surface
Piston skirt
diameter
STD mm (in) 47.975 – 47.990 (1.8888 – 1.8894)
Piston measuring position mm (in) 5 (0.2) from piston skirt end
Cylinder bore wear Limit mm (in) 0.100 (0.0039)
Piston ring
end gap 1st,
2nd
STD mm (in) 0.15 – 0.35 (0.006 – 0.014)
Limit mm (in) 0.50 (0.020)
Piston ring
free end gap
1st
STD mm (in) Approx. 6.1 (0.24)
Limit mm (in) 4.9 (0.19)
2nd
STD mm (in) Approx. 5.7 (0.22)
Limit mm (in) 4.6 (0.18)
Piston ring to
groove
clearance
1st,
2nd
STD mm (in) 0.020 – 0.060 (0.0008 – 0.0024)
Limit mm (in) 0.120 (0.0047)
Piston ring
groove width 1st,
2nd
STD mm (in) 1.21 – 1.23 (0.048 – 0.049)
Oil STD mm (in) 1.51 – 1.53 (0.059 – 0.060)
Piston ring
thickness 1st,
2nd
STD mm (in) 1.17 – 1.19 (0.046 – 0.047)
Pin clearance in
piston pin hole STD mm (in) 0.002 – 0.013 (0.0001 – 0.0005)
Limit mm (in) 0.040 (0.0016)
Piston pin outside
diameter STD mm (in) 11.995 – 12.000 (0.4722 – 0.4724)
Limit mm (in) 11.980 (0.4717)
Piston pin hole
diameter STD mm (in) 12.002 – 12.008 (0.4725 – 0.4728)
Limit mm (in) 12.030 (0.4736)
Pin clearance in
conrod small end STD mm (in) 0.006 – 0.019 (0.0002 – 0.0007)
Limit mm (in) 0.050 (0.0020)