Checking/Measuring The Cylinder; Checking/Measuring The Piston - KTM 50 SX Repair Manual
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Also See for 50 SX:
- Owner's manual (91 pages) ,
- Setup instructions (19 pages) ,
- Owner's handbook manual (26 pages)
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30/ENGINE - WORK ON INDIVIDUAL PARTS
Checking/measuring the cylinder
16.11
Checking/measuring the piston
16.12
»
If the clutch linings are damaged:
–
Replace the clutch linings.
–
Assemble the centrifugal clutch. (
–
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 locations on the
micrometer to check for oval wear.
Guideline
Cylinder - bore diameter
Size A
300515-10
Size B
–
The cylinder size
300525-10
–
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 ring moves smoothly in the piston ring groove.
»
If the piston ring is stiff:
–
Clean the piston ring groove.
300526-10
–
Check the piston ring for damage.
»
If the piston ring is damaged:
–
Change the piston ring.
–
Check the piston ring anti-rotation lock for damage and to ensure that it is firmly
seated.
»
If the piston ring anti-rotation lock is damaged or loose:
–
Change the piston.
–
Check the piston pin for discoloration or signs of wear.
»
If the piston pin has strong discoloration/signs of wear:
–
Change the piston and, if necessary, the piston pin bearing.
–
Check the piston pin bearing for damage and wear.
»
If there is damage or wear:
–
Change the piston pin bearing and connecting rod, if necessary.
p. 80)
39.505... 39.517 mm (1.55531...
1.55578 in)
39.517... 39.530 mm (1.55578...
1.5563 in)
is labeled on the side of the cylinder.
Tip
Use an old piston ring to clean the piston ring groove.
81
and
axes using a
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