143
ATV-1069
Measuring Piston Skirt/Cylinder
Clearance
1. Measure the cylinder front to back in six places.
CC127D
2. Measure the corresponding piston diameter at a point
15 mm (0.6 in.) above the piston skirt at a right angle
to the piston-pin bore. Subtract this measurement
from the measurement in step 1. The difference
(clearance) must not exceed specifications.
Installing Piston Rings
1. Install the expander spring making sure the ends are
aligned on the wire; then install the oil ring with the
ring gap 90° from the spring gap and the marking “E
TOP” directed toward the top of the piston.
GZ168
GZ169A
2. Install the second compression ring with the marking
“E TOP” directed toward the top of the piston.
GZ167
3. Install the first (unmarked) compression ring; then
rotate the rings so the ring gaps are approximately
180° apart and oriented to the piston pin.
GZ187A
CYLINDER/CYLINDER HEAD
ASSEMBLY
NOTE: If the cylinder/cylinder head cannot be trued,
they must be replaced as an assembly.
CAUTION
Incorrect installation of the piston rings will result in
engine damage.
