AD Boivin 2002 Snow Hawk, Service Manual, Page: 58 / 173

ENGINE / CYLINDERS AND CYLINDER HEADS 7 - 8
o
Take the piston pin out by unscrewing the extractor until
the first thread of the rod and the mark 503 are in line
with one another.
1. Mark 503 of the extractor
o
Turn the extractor as shown to take the piston out.
o
Remove the piston from the connecting rod.
o
Install the positioning socket, then push the needle
bearings and the stop washers using a tappet 22 mm
(0.826 in) in diameter.
l
NOTICE:
Pistons and oversized segments of 0.25 mm and 0.5 mm are
available if needed
Join all the needles, the stop washers and the sockets using a
lock fastener.
Inspection
Taper of the cylinder
Compare the diameter of the cylinder, 16 mm (5/8 in) from the
top, to its diameter just under the intake port.
If the difference is more than 0.8 mm (.003 in), the cylinder
must be reamed again or replaced.
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NOTICE:
Make sure to resharpen the bevelled edge around the intake
ports of the cylinder linings after each honing.
Ovalization of the cylinder
Using a dial gauge, measure the cylinder at 16 mm (5/8 in)
from the top to see if the ovalization exceeds 0.05 mm (.002
in). If so, the cylinder must be reamed again or replaced.
l
NOTICE:
Make sure to resharpen the bevelled edge around the intake
ports of the cylinder linings after each reaming.
Tappet
de 21mm (0.826 po)
Under intake port
At 16 mm (5/8 in)
below the top
Piston wrist pin
axis
Measure to
compare