Honda 954 Service Manual page 317

Temporarily 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:
Second: 0.06 mm (0.002 in)
Inspect the piston for wear or damage.
Insert the piston ring squarely into the bottom of the
Push the rings
cylinder and measure the ring end gap.
into the cylinder
with the top of
be
the piston to
SERVICE LIMITS:
sure they are
Top:
squarely in the
Second:
Oil (side rail): 0.9 mm (0.04
Measure the diameter of
from the bottom and
hole.
SERVICE LIMIT: 74.895 mm (2.949 in)
0.08 mm (0.003 in)
in)
0.5 mm (0.02
in)
0.7 mm (0.03
in)
the piston a t 4 m m (0.2 in)
90
degrees to the piston pin