KTM 450 EXC-F 2017 Repair Manual page 202

18
ENGINE
200
Check the va lve plate for run-out.
Va lve
Run-out at va lve plate
:S
0 .05 mm
(:S
0 .002 in)
If the measured va lue does not meet specifications:
Change the va lve.
Check sealing seat
f)
on va lve f or damage and wear.
»
If the sealing surface is damaged or worn:
Machine the va lve seat.
3 02808-10
18.4.28 Checking valve springs
Check the va lve springs for breakage and wear (visual check) .
If the valve spring is broken or worn:
Change the va lve spring.
Measure the length of the valve springs.
Va lve spring
Minimum length, intake (without
1 40.7 mm (1.602 in)
va lve spring seat)
304678-10
Va lve spring
Minimum length , exhaust (without
1 40.7 mm (1 .60 2 in)
va lve spring seat)
»
If the measured va lue does not meet specifications:
Change the va lve spring.
18.4.29 Checking valve spring seat
Check the va lve spring seat for breakage and wear (visual check).
»
If the valve spring seat is broken or worn :
Change the va lve spring seat .
Measure the thi ckness of the va lve spring seat .
Va lve spring
Valve spring seat 1.9 . .. 2.1 mm (0.075 .. . 0.083 in)
»
If the measured va lue does not meet specifications:
...._ _ _ _ _ _ _ _ _ _ _ _ _ 3 _0_ 4_ 6 _ 7 9 _-_ 10 _ ,
Change the va lve spring seat .
18.4.30 Checking the cylinder head
Check exhaust valve guides
0
using the special tool.
I
Limit plug gauge (590290 26006)
( 0
p. 364 )
»
If the special t ool is easy to insert in the valve guide:
Change the va lve guide and va lve.
Check intake va lve guides
8
using the special tool.
I
Limit plug gauge (59029026006)
( 0
p. 364)
001859-10
»
If the special t ool is easy to insert in the valve guide: