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Maintenance
ASSEMBLY
Clean the piston ring grooves thoroughly.
• Be careful not to damage the piston when cleaning the
piston ring grooves.
Apply engine oil to each piston ring entire surface.
Install the spacer [1] first, then install the side rails [2] on
the piston [3].
Install the second ring [4] on the piston with "RN" mark [5]
side facing up.
Install the top ring [6] on the piston with "1R" mark [7]
side facing up.
• Do not damage the piston ring by spreading the ends
too far.
• Be careful not to damage the piston during piston ring
installation.
• Stagger the piston ring end gaps 120° apart from each
other.
Stagger the side rail end gaps as shown.
After installation, check that the rings rotate freely without
sticking.
[6]
[5]
120°
[4]
[1]
[2]
: Each piston ring entire surface
2-40
[7]
[6]
[4]
[2]
[1]
[2]
20 mm (0.8 in) or more
[3]
Place a shop towel over the cylinder opening.
• Prevent dust or dirt from entering the crankcase.
Apply molybdenum oil solution to the connecting rod
small end [1] inner surface.
[1]
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