BRP Johnson 4HP - Page 97

6-23
POWERHEAD
CYLINDER / PISTON / PISTON RING
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 in the fig-
ures.
Piston
1st ring and 2nd ring
Oil ring
NOTE:
For the oil ring side rail, measure the outer diameter of the
rail in order to distinguish because there is no I.D. mark.
Oversize I.D. mark
0.25 mm 0.25
0.50 mm 0.50
Oversize I.D. mark
0.25 mm 25
0.50 mm 50
Oversize I.D. mark
0.25 mm White paint
0.50 mm Blue paint
I.D. mark
I.D. mark
1st, 2nd, ring
I.D. mark
Oil ring spacer