KTM 450 SX-F EU Repair Manual

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301ENGINE - WORK ON THE INDIVIDUAL PARTS
301249-10
40037&-10
Cbeckin &(m easurinl tile piston
- The cylinder size is marked on the cylinder collar.
- Using a straightedge and the special tool, check the sealing area of the cylinder
head for distortion.
I Feeler gauge (59029041100) ( .. p. 230)
Cylinder/cylinder head - distortion of
sealing area
s 0.10 mm (S 0.0039 in)
> If the measured value does not meet specifications:
- Change the cylinder.
- Check the piston sliding surface for damage.
> If the piston sliding surface is damaged:
- Replace the piston and,
if necessary, the cylinder.
- Check
that the piston rings move easily in the piston ring grooves.
> If a piston ring exhibits excessive resistance:
- Clean the piston ring groove.
• Tip
I An old piston ring can be used to clean the piston ring groove.
- Check the piston rings for damage.
> If the piston ring is damaged:
- Replace the piston ring.
• Info
I Mount the piston ring with the marking facing upward.
- Check the piston pins for discoloration or signs of wear.
> If the piston pin shows severe discoloration/signs of wear:
- Replace the piston pin.
- Place the piston pin in the connecting
rod and check the seating for play.
> If the piston pin seating has excessive play:
- Replace the connecting rod and piston pin.
- Measure the pistons at the piston skirt, perpendicular
to the piston pin.
Guideline
Piston - diameter
Size I
96.960 ... 96.970 mm (3.81732 ...
3.81771
in)
Size II
96.971...96.980 mm (3.81775 ...
3.8181
in)
•
Info
I Piston dimensions are marked on the piston head.
142

KTM 450 SX-F EU Specifications

General

Brand	KTM
Model	450 SX-F EU
Category	Motorcycle
Language	English