Bore Check; Cylinder Reassembly - Suzuki RG250 Service Manual

3-21 ENGINE
Bor.
• The wear of the cylinder wall is determined
from diameter reading taken at 25 mm from the
top of the cylinder with a cylinder gauge.
• If the wear thus determined exceeds the limit
indicated below, rework the bore to the next
oversize
by using
a boring machine or replace
the cylinder with a new one.
• Oversize pistons are available in two sizes:
0.5 mm and 1.0 mm oversizes.
09900- 20508
Cylinder gauge set
Serv ic e Limit
54.070 mm
• After reworking the bore to an oversize,
be
sure
to chamfer the edges of ports and smooth the
chamfered edges with emery paper, To chamfer,
use a scraper, taking care not to nick the wall
surface.
r
NOTE:
Minor surface flaws on the cylinder wall due
to seizure or similar abnormalities can be
corrected by grinding the flaws off with fine-
grain emery paper. If the flaws are deep
grooves or otherwise persist, the cylinder
must be reworked with a boring machine to
the next oversize.
REASSEMBLY
• Apply SUZUKI super grease "A" to the lip of
oil seals lightly.
CAUTION:
Do not apply grease to the exhaust valve.
99000-25010
SUZUKI super grease "A"
• Install the each exhaust valve to the respective
cylinders.
25mm
O.5- 1.0::-~
l~
~~
O .3 - 0.5mm
~--:-~
O_5 - 1 .0 ~