Honda 2000 XR50R Service Manual page 95

Temporarilv install the piston rings to their proper
position with the mark facing up.
Measure the piston ring-to-ring groove clearance
with the rings pushed into the grooves.
SERVICE LIMITS:
Top: 0.12 mm (0.005 in)
Second: 0.12 mm (D.OOS in)
Inspect the piston for wear or damage.
Measure the diameter of the piston at 8 mm (0.3 in)
from the bottom and 90 degrees to the piston pin
hole.
SERVICE LIMIT: 38.90 mm (1.53 1 in)
Measure the "islon pin bore.
SERVICE LIMIT: 13.06 mm (0.514 in)
Measure the 0.0. altha piston pin .
SERVICE LIMIT: 12.98
mm
(0.51 1
in)
Calculate the piston-ta-piston pin clearance.
SERVICE LIMIT: 0.08 mm (0.003 in)
CYLINDER/PISTON
8-5