CYLINDER AND PISTON
ENG
EAS00255
CHECKING THE CYLINDER AND PISTON
1.
Check:
• piston wall
• cylinder wall
Vertical scratches -* Rebore or replace
the cylinder, and replace the piston and
piston rings as a set.
2.
Measure:
piston-to-cylinder clearance
•••••••••••••••••••••••
a. Measure cylinder bore “C” with the cylinder
bore gauge.
NOTE:
Measure cylinder bore “C” by taking side-to-side
and front-to-back measurements of the cylinder.
Then,
find the average of the measurements.
Cylinder
bore
“C”
Taper limit “T”
Out-of-round “R”
“C” = maximum of D
38.000 ~
38.010mm
(1.4961 ~
1.4965in)
0.05mm
(0.0020in)
0.05mm
(0.0020in)
~ D
“T” = maximum of D or D
“R” = maximum
of
D
1
, D
3
or
D
6
- maximum of D or D
or
D
5
- minimum
of
D
2
, D
4
b. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
c. Measure piston skirt diameter “P” with the
micrometer.
a 5mm(0.1969in) from the bottom edge of the
piston
Piston size “P”
Standard 37.975 ~ 37.990mm
(1.4951
~
1.4957in)
d.
If out of
specification,
replace the piston and
piston rings as a set.
5-33
Downloaded from www.ScooterTime.net
To Next Page
Loading...
