Piston Removal; Cylinder/Piston/Cam Chain; Tensioner Lifter Inspection - Honda CRF450R 2009 Service Manual

CYLINDERIPISTON
PISTON REMOVAL
Place a clean shop Remove the piston pin clips with pliers.
towel over the
Press the piston pin out of the piston and remove the
CfBnkcasBto
pt'&VBnt the piston
pin clip from
dropping
into
the
crankcase.
piston.
Under racing conditions, the piston, piston pin and
piston rings should be replaced according to the
maintenance schedule (page 4-4),
Pis/on rings are Spread the piston rings, and remove them by lifting up
easily broken; take al a point just opposite the gap.
care
not to damage
them during
removal.
CYLINDER/PISTON/CAM CHAIN
TENSIONER LIFTER INSPECTION
CYLINDER
Inspect the cylinder bore for wear or damage.
Measure the cylinder 1.0. in the X and Y axis al three
levels.
Take the maximum reading to determine the cylinder
wear.
SERVICE LIMIT: 96.025
mm
(3.7805 In)
Calculate the cylinder-to-piston clearance.
Take a maximum reading to determine the clearance.
For piston
0 .0 .
(page
10-7).
SERVICE LIMIT: 0.085 mm (0,0033 In)
Calculate the taper and out-of-round at three levels in
~================:;
10-6
the
X
and
Y
axis. Take the maximum reading
to
determine the cylinder condition.
STANDARD:
Taper: 0.010 mm (0.0004 In)
Out-of-round : 0.010 mm (0.0004 in)
TOP
MIDDLE
BanOM