POWER UNIT 6-45
3. Calculate the piston / cylinder clearance (Clearance equals
difference between piston diameter and cylinder bore mea-
surements).
Piston to cylinder clearance :
Standard : 0.020 – 0.040 mm (0.0008 – 0.0016 in.)
Service limit : 0.100 mm (0.0039 in.)
If clearance exceeds service limit, replace piston and/or cylin-
der or rebore cylinder.
• Piston
Oversize I.D. mark
0.25 mm 0.25
0.50 mm 0.50
• 1st & 2nd Piston ring
Oversize
I.D. mark
25
0.25 mm
50
0.50 mm
• Oil ring
Oversize I.D. mark
0.25 mm Two (2) blue paints
0.50 mm Red paint
I.D. mark
0.25
or
0.50
I.D. mark
1st, 2nd ring
I.D. mark
Oil ring spacer
Identification of oversize piston / piston ring
Two oversize piston / piston ring components, 0.25 mm and
0.50 mm, are available.
Oversize piston / piston ring are marked as shown below.
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