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Piston Ring Groove Wear; Piston Ring Thickness - Kawasaki ZR-7S Service Manual

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3-36
ENGINE TOP END
Cylinders
and Pistons
Piston Ring Groove Wear
.
Using a vernier caliper, measure the groove width at sev-
erallocations
around the piston.
Piston Ring Groove Width
Standard:
Top
Second
1.03 -1.05 mm (0.0406 - 0.0413 in.)
1.22 - 1.24 mm (0.0480 - 0.0488 in.)
2.01 - 2.03 mm (0.0791 - 0.0799 in.)
Oil
Service Limit:
Top
1.13 mm (0.0455 in.)
Second
1.32 mm (0.0520 in.)
Oil
2.11 mm (0.0831 in.)
*
If any of the groove widths is wider than the service limit,
replace the piston.
Piston Ring Thickness
.
Using a micrometer, measure the thickness at several 10-
cations around the ring.
Piston Ring Thickness
Standard:
Top
Second
Oil
0.970 - 0.985 mm (0.0382 - 0.0390 in.)
1.17 - 1.19 mm (0.0461 - 0.0469 in.)
0.20 - 0.70 mm (0.0079 - 0.0276 in.)
Service Limit:
Top
0.90 mm (0.0354 in.)
Second
1.10 mm (0.0433 in.)
Oil
1.0 mm (0.0394
in.)
*If any of the measurements
is less than the service limit
on either of the rings, replace the rings as a set.
NOTE
o
When using new rings on a used piston, check for un-
even groove wear. The rings should fit perfectly parallel
to the groove sides. If not, replace the piston.

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