6-58 POWER UNIT
1st ring and 2nd ring
1. Apply engine oil to piston ring.
2. Install 2nd ring and 1st ring to piston.
NOTE:
• 1st ring differs from 2nd ring in shape and color of surface
contacting cylinder wall.
Distinguish 1st ring from 2nd ring by referring to figure.
• As shown in figure, 1st and 2nd ring are marked, “RN” or “R”.
When installing these piston rings, the marked side of each
ring should face towards top of piston.
Ring gap direction
Position rings so that their gaps are staggered at approxi-
mately 90 degree angles as shown in figure.
1 1st ring 3 2nd ring
2 Oil ring lower side rail 4 Oil ring upper side rail
Failure to stagger piston ring gaps may result in crank-
case oil dilution.
Up mark “O”
1
2
3
4
Incorrect
Correct
PISTON RING TO PISTON
Oil ring
1. Apply engine oil to piston rings.
2. Install spacer 1 first, then side rails 2 to piston.
When installing spacer, do not allow ends to overlap in
groove.
Mark
"RN"
"R"
1. 1st ring
2. 2nd ring
3. Oil ring
1
2
3
2
1
2
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