Honda CRF50F 2004-2015 - Cylinder;Piston Inspection

CYLINDER/PISTON INSPECTION
Inspect the cyli nder bore for wear or damage.
Measure the
cvl inder I.D. in X and Y axis at three
levels.
Take the max i mum reading to deter mine the cylin-
der wear.
SERVICE LIMIT : 39. 05 mm (1 .537 in)
Calculate the piston-I o-cylinder clearance.
Take a
maximum reading to determine the clear-
ance.
Refer to page 8-6 for measurement of the piston
0 . 0.
SERVICE UMIT: 0.15 mm (0. 006 in)
Calculate the taper and out of round at three levels
in X and Y axis. Take the maximum reading to
determine them.
SERVICE LIMITS :
Tap er:
Out of round:
0. 10 mm (0. 004 in)
0. 10 mm (0. 004 in)
The
cylinder must be rebored and an oversize pis·
ton fined if the service limits are exceeded.
The following oversize pistons are available:
0.25
mm (0 . 010 in)
0.50 mm (0.020 in)
The
piston to cyl inder clearance for the oversize pis-
ton must be: 0.010 - 0.040 mm (0.0004 - 0.0016 in ).
Inspect the top of the cyl inder for warpage .
SERVICE UMIT: 0.05 mm (0.002 in)
Remove
any carbon deposits from the piston ring
grooves,
using an old piston ring as shown.
CYLINDER/PISTON
TOP
MIDDLE
BOTTOM
8-5