Cylinder/Piston Inspection; Piston/Piston Pin/Piston Ring - Honda 2010 CRF250R Service Manual

CYLINDER/PISTON INSPECTION
CYLINDER
Never use
a
wire
brush; ;/ will scratch
the groove.
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: 76.825 mm (3.0246 in)
Calculate the cylinder-la-piston clearance.
Take a maximum reading to determine the clearance.
For piston O.D. (page 9-6).
SERVICE LIMIT: 0.085 mm (0.0033 in)
Calculate the taper and aut-af-round at three levels in
the X and Y axis. Take the maximum reading to
determine the cylinder condition.
SERVICE LIMITS :
Taper: 0.010 mm (O.0004 in)
Out-of-round: 0.010 mm (0.0004 in)
Inspect the lop of the cylinder for warpage.
SERVICE LIMIT: 0.05 mm (0 .002 in)
PISTON/PISTON PIN/PISTON RING
Remove the carbon deposits from the piston head and
piston ring grooves with the used piston ring .
Inspect the piston for damage and piston ring grooves
for wear.
Replace the piston if necessary.
CYLINDER/PISTON
TOP
MIDDLE
BOTTOM
PISTON RING
9-5