Yamaha TDM850 1996 Service Manual page 149

CYLINDER AND PISTON
Cylinder bore "C" 89.500 X 89.505 mm
Taper limit "T"
Out of round "R"
"C" = Maximum D
"T" = (Maximum D
or D )
6
"R" = (Maximum D
– (Minimum D
S If out of specification, rebore or replace the cylin-
der, and replace the piston and piston rings as
set.
2nd step:
S Measure the piston skirt diameter "P" with a mi-
crometer.
a
5.5 mm from the piston bottom edge.
Standard
Oversize 2
Oversize 4
S If out of specification, replace the piston and pis-
ton rings as a set.
3rd step:
S Calculate the piston-to-cylinder clearance with
following formula:
Piston-to-cylinder clearance =
Cylinder bore "C" –
Piston skirt diameter "P"
Piston-to-cylinder clearance:
S If out of specification, rebore or replace the cylin-
der, and replace the piston and piston rings as
set.
4-25
ENG
0.05 mm
0.03 mm
, or D ) – (Maximum D
1 2
, D or D )
1 3 5
, D or D
2 4 6
Piston size P
89.420 X 89.435
0.50 mm
1.00 mm
0.065 X 0.085 mm
<Limit>: 0.15 mm
5
)
mm