Suzuki DF 25, Service Manual, Page: 90 / 148

6-24 POWER UNIT
Piston to cylinder clearance
To check the clearance, measure the following items.
• Cylinder bore at 20 mm elevation from the gasket surface at a
right angle to the crankshaft pin.
• Piston skirt diameter at 5 mm elevation from the skirt end.

09900-20530: Cylinder gauge set
09900-20202: Micrometer
Piston to cylinder clearance:
Standard: 0.018 – 0.033 mm (0.0007 – 0.0013 in)
Service limit: 0.100 mm (0.0039 in)
If the clearance exceeds the service limit, replace the piston
and/or the cylinder, or rebore the cylinder.
Cylinder bore:
Standard: 48.000 – 48.015 mm (1.8898 – 1.8904 in)
Piston skirt diameter:
Standard: 47.975 – 47.990 mm (1.8888 – 1.8894 in)
Identification of oversize piston and piston ring
Oversize piston and piston ring are marked as show in the fig-
ures.
Piston
1st ring & 2nd ring
Oil ring
20 mm
5 mm
(0.2 in)
Oversize I.D. mark
0.50 mm 50
I.D. mark
Oversize I.D. mark
0.50 mm 50
I.D. mark
Oversize I.D. mark
0.50 mm Blue paint
I.D. mark