Piston Installation - Honda CRF450R 2009 Service Manual

CYLINDERIPISTON
PISTON INSTALLATION
Install the top ring
on the piston with
the marked side
facing up.
When cleaning the
cylinder mating
surface, place
a
shop towel over the
cylinder opening
/0
preVfJnt dust
or
dirt
from enten'ng the
crankcase.
'09- '12:
After '12:
10·10
Clean the piston ring grooves thoroughly.
Apply engine oil to the piston rings, and install them as
shown.
Do not damage the piston ring by spreading the
ends too far,
Be careful not to damage the piston during piston
ring installation.
Do not align the oil ring (side rails) gaps.
Space the oil ring end 90· apart.
After installation, the rings should rotate freely in the
piston ring grooves.
Clean any gasket material from the cylinder mating
surfaces of the crankcase.
Apply molybdenum oil solution to the connecting rod
small end inner surface.
Apply engine oil to the piston pin outer surface and
piston pin hole of the piston.
Apply molybdenum oil solution to the piston pin outer
surface.
Apply engine oil to the piston pin hole of the piston.
Install the piston with the -IN" mark facing intake side.
Install the piston pin and new piston pin clips.
Do not align the piston pin clip end gap with the
piston cut-out.
Always use new piston pin clips. Reinstalling used
piston pin clips may lead to serious engine damage.
"71
TOP RING
MARK
I
OIL RING
"71