Kawasaki STX-15F Jet Ski User Manual


 
ENGINE TOP END 6-35
Cylinder, Pistons
Piston Ring Thickness
Measure the piston ring thickness.
Use the micrometer to measure at several points around
the ring.
Piston Ring Thickness
Standard:
Top [A]
0.87 0.89 mm (0.0343 0.0350 in.)
Second [B] 0.97 0.99 mm (0.0382 0.0390 in.)
Service Limit:
Top [A]
0.80 mm (0.0315 in.)
Second [B] 0.90 m m (0.0354 in.)
If any of the measurements is less than the service limit
on either of the rings, replace all the rings.
NOTE
When using new rings in a used piston, check for un-
even groove wear. The rings should fit perfectly parallel
to the groove sides. If not, replace the piston.
Piston Ring End Gap
Place the piston ring [A] inside the cylinder, using the pis-
ton to locate the ring squarely in place. Set it close to the
bottom of the cylinder, where cylinder wear is low.
Measure the gap between the ends of the ring with a thick-
ness gauge [B].
Piston Ring End Gap
Standard:
Top
0.25 0.40 mm (0.0098 0.0157 in.)
Second 0.40 0.55 mm (0.0157 0.0217 in.)
Service Limit:
Top
0.7 mm (0.0276 in.)
Second 0.8 mm (0.0315 in.)
If the end gap of either ring is greater than the service
limit, replace all the rings.