Checking/Measuring The Cylinder; Checking/Measuring The Piston - KTM 690 Enduro EU 2009 Repair Manual

30/ENGINE - WORK ON INDIVIDUAL PARTS

Checking/measuring the cylinder

19.12

Checking/measuring the piston

19.13
A 0 0 A
A 0 0 A
A 0 0 A
–
Check the O-ring of the chain adjuster for damage and wear.
» If there is damage or wear:
–
Replace the O-ring.
–
Check the cylinder bearing surface for damage.
» If the cylinder bearing surface is damaged:
–
Change the cylinder and piston.
–
Measure the cylinder diameter at several places in the
micrometer to check for oval wear.
300102-10
–
To determine the size, measure the cylinder at a distance
the cylinder.
Guideline
Distance

Cylinder - bore diameter
Size I
Size II
–
The cylinder size
300103-10
–
Check the sealing area of the cylinder head for distortion using a straight edge and
the special tool.
Feeler gauge (59029041100) (
Cylinder/cylinder head - sealing area
distortion
» If the measured value does not equal the specified value:
–
Change the cylinder.
400376-10
–
Use the special tool to measure clearance
groove.
Guideline
Piston ring - groove clearance
Feeler gauge (59029041100) (
» If clearance
–
Change the piston and piston rings.
–
Check/measure the cylinder. (
400484-10
–
Check the piston bearing surface for damage.
» If the piston bearing surface is damaged:
–
Change the piston and, if necessary, the cylinder.
–
Check that the piston rings can move easily in the piston ring grooves.
» If the piston ring is stiff:
300099-10
55 mm (2.17 in)
102.000... 102.012 mm (4.01574...
4.01621 in)
102.013... 102.025 mm (4.01625...
4.01672 in)
is marked on the side of the cylinder.

p. 248)
≤ 0.10 mm (≤ 0.0039 in)

≤ 0.08 mm (≤ 0.0031 in)
p. 248)
is larger than the specified value:

p. 129)
and axes using a
 
from the top edge of

of the piston rings in the piston ring
129