Yamaha CE50T Service Manual page 62

5. Inspect:
oCylinder wall
Wear/Scratches -_Rebore or replace.
6. Measure:
i_± ®Piston-to-cylinder clearance
::_ ......... _ (_ Piston-to-cylinder clearance measurement
steps:
First step:
®Measure the cylinder bore "'C" with a Cylinder
:_ D_ Bore Gauge.
NOTE:
.-,_ r__ _-,._ _ ...... Measure the cylinder bore "C" in parallel to and
/
_- _ at right angles to the crankshaft. Then, find the
--_._--_ --=_" average of the measurements.
_ Standard Wear Limit
Cylinder bore 40.00-40.02 mm 40.50 mm
"C" (1.575-1.583 in) (1.594 in)
0.05 mm
Taper "'T"
(0.0019 in)
Out of round 0.01 turn
"'R" (0.0004 in)
C= Maximum D
T=(Maximum Dz or D2) -
(Maximum Ds or D6)
R=(Maximum D1, D3 or Ds) -
(Minimum D2, D4 or D6)
elf out of specification, rebore or replace
cylinder, and replace piston and piston rings
as a set.
__ 2nd step:
_/ ®Measure the piston skirt diameter "P" with
a micrometer.
307,000
3-17