Honda TRX400EX FOURTRAX 1999, Service Manual

Page: 116 / 263

Spread each piston ring and remove it by lifting up a t
a
point opposite the gap.
CAUTION:
Do not damage t h e piston ring by spreading t h e
ends too far.
PISTON
Clean carbon deposits from the piston.
CAUTION
Clean carbon deposits
from
the ring grooves with
a
ring that be discarded. Never use a wire brush;
scratch the groove.
INSPECTION
CYLINDER
Inspect the cylinder bore for scratch or wear.
Measure the cylinder at three levels in an X and Y
axis.
Take the maximum reading to determine the cylinder
wear.
SERVICE LIMIT 85.10 mm 13.350 in)
Calculate the cylinder-to-piston clearance.
Refer to page
for measurement of the piston
SERVICE
LIMIT 0.10
mm (0.004
Calculate the cylinder taper and out-of-round at three
levels in an
X
and Y axis. Take the maximum reading
to determine the taper and out-of round.
SERVICE LIMITS Taper: 0.05 mm (0.020
Out-of-round: 0.05 mm 10.020 in)
The cylinder must be rebored and an oversize piston
fitted if the service limits are exceeded.
The
0.25
in) and 0.50 mm (0.020
in)
over-
size pistons are available.
The cylinder must be rebored
so
that the clearance
for an oversize piston is
0.015
-
0.050
m m (0.0006
-
0.0020 in).
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