Suzuki DF 25 Service Manual page 172

PISTON RING TO PISTON
Oil ring
• Apply engine oil to piston rings.
• Install spacer 1 first, then side rails 2 to piston.
When installing spacer, do not allow ends to overlap in
groove.
1st ring and 2nd ring
• Apply engine oil to piston ring.
• Install 2nd ring and 1st ring to piston.
NOTE:
• 1st ring ditters from 2nd ring in shape and color of surface
contacting cylinder wall.
Distinguish 1st ring from 2nd ring by referring to figure.
• As indicated in figure, 1st and 2nd ring are marked, "RN" or
"R" .
When installing these piston rings, the marked side of each
ring must face towards top of piston.
Ring gap direction
Position rings so that their gaps are staggered at approxi-
mately 90 degree angles as shown.
1 1st ring
2 Oil ring lower side rail
Failure to stagger piston ring gaps may result in crank-
case oil dilution.
3 2nd ring
4 Oil ring upper side rail
POWER UNIT 7-55
Incorrect
Correct
Mark
1st ring
2nd ring
Up mark "O"
"RN"
"R"
1
2
3
1. 1st ring
2. 2nd ring
3. Oil ring
1st ring
2nd ring