Suzuki DR 125 Service Manual page 69

OVERSIZE RINGS
Oversize piston ring
The following oversize piston ring is used. It bears the following
identification number.
Piston ring 1st and 2nd 0.5 mm: 50
Oversize oil ring
The following oversize oil ring is used. It bears the following
identification mark.
Oil ring 0.5 mm: Painted red
Oversize side rail
Measure the outside diameter to identify the size.
PISTON PIN BORE
Measure the piston pin bore inside diameter using the caliper
gauge and measure the piston pin outside diameter using the
micrometer. If either is out of specification or the difference
between these two measurements is more than the limits,
replace both piston and piston pin.
$ Piston pin bore
Service Limit: 14.030 mm (0.5524 in)
$ Piston pin O.D.
Service Limit: 13.980 mm (0.5504 in)
& 09900-20605: Dial calipers
09900-20205: Micrometer (0 – 25 mm)
Oil ring spacer
Paint
ENGINE 3-33
0.5 mm O.S.