Checking The Valves; Checking The Valve Springs - KTM 450 SX-F EU Repair Manual

301ENGINE - WORK ON THE INDIVIDUAL PARTS
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300117-10
Cbeckin& the valves
200193-10
400373-10
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- Remove the valve spring retainer and valve springs.
- Pull the valve out of the valve guide from below and remove valve stem seal and
valve spri ng seat
- Mark the valves corresponding to their installation position.
• Info
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Place the valves in a carton corresponding to their installation position and
label them.
- Check the valve plate for run-{lut.
Valve - run-{lut
At the valve plate " 0.05 mm (" 0.002 in)
• If the measured value does not meet specifications:
- Change the valve.
- Check sealing seat on the valve.
Valve - sealing seat width
Intake
1.50 mm (0.0591 in)
Valve - sealing seat width
Exhaust 1.50 mm (0.0591 in)
• If the sealing seat is not centered on the valve seat or deviates from the specifi-
cation:
- Machine the valve seat.
- Check the valve springs for breakage and wear (visual check).
• If the valve spring is broken or worn:
- Change the valve spring.
- Measure the length of the valve springs.
Valve spring
Minimum length 42.8 mm (1.685 in)
• If the measured value does not meet specifications:
' -_ _ _ _ _ _ _ _ _ _ --=30:..:1:.::6=80-:....:;10:.J -
Change the valve springs.