Checking The Valves; Checking The Valve Springs; Checking The Lower Valve Spring Retainer - KTM 450 XC 2008 Repair Manual

30/ENGINE - WORK ON INDIVIDUAL PARTS

Checking the valves

19.12
Info
The valve stem is chrome-hardened, and wear normally takes place in the valve guide.
A 0 0 A

Checking the valve springs

19.13

Checking the lower valve spring retainer

19.14
–
Check for valve retainer run-out.
Valves
Run-out on valve plate
» If the measured value does not equal the specified value:
–
Change the valve.
200193-10
–
Check sealing seat
Valves
Sealing seat width, intake
Valves
Sealing seat width, exhaust
» If the sealing area is not in the center of the valve seat or if it differs from the
specified value:
–
Machine the valve seat.
400373-10
–
Check the valve springs for breakage and wear (visual check).
» If the valve spring is broken or worn:
–
Change the valve spring.
–
Measure the valve spring length.
Valve springs
Minimum length of outside spring
Minimum length of inside spring
» If the measured value does not equal the specified value:
600280-01
–
Change the valve spring.
–
Check the lower valve spring retainer for breakage and wear (visual check).
» If the lower valve spring retainer is broken or worn:
–
Change the valve spring retainer.
–
Measure the thickness of the lower valve spring retainers.
Lower valve spring retainer - strength
» If the measured value does not equal the specified value:
–
Change the valve spring retainer.
600281-01
≤ 0.05 mm (≤ 0.002 in)
on the valve.

1.50 mm (0.0591 in)
2.00 mm (0.0787 in)
39.20 mm (1.5433 in)
36.45 mm (1.435 in)
0.4... 0.5 mm (0.016... 0.02 in)
108