9-6
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CYLINDER/PISTON
INSTALLATION
Carefully install the piston rings into the piston ring grooves with the markings facing up.
• Do not damage the piston ring by spreading the ends too far.
• Be careful not to scratch the piston surface.
• Do not confuse the top and second rings.
Stagger the ring end gaps 120 degrees apart from each other.
Stagger the side rail end gaps as shown.
Apply molybdenum oil solution to the piston pin outer
surface and connecting rod small end inner surface.
Apply engine oil to the piston pin hole [1].
Install the piston [2] with its “IN” mark [3] toward the
intake side and insert the piston pin [4] through the
piston and connecting rod.
Place a shop towel over the crankcase opening to
prevent piston pin clips from falling into the crankcase.
Install new piston pin clips [1] into the grooves in the
piston pin hole.
• Make sure that the piston pin clips are seated
securely.
• Do not align the piston pin clip end gap with the
piston cutout.
120°
120°
120°
SIDE RAILS
A: 20 mm (0.8 in) or more
A
A
TOP RING
SECOND RING
SECOND RING MARK
TOP RING
MARK
SPACER
SECOND RING
TOP RING
OIL RING
[1]
[2]
[3]
[4]
[1]
Summary of Contents for XL125LK
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