17 ENGINE
17.4.30 Checking valve springs
304678-10
17.4.31 Checking valve spring seat
304679-10
17.4.32 Checking the cylinder head
310049-10
208
- 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
Intake minimum length
40. 7 mm (1 .602 in)
(without valve spring
seat)
Valve spring
Exhaust minimum length 40. 7 mm (1 .602 in)
(without valve spring
seat)
If the measured value does not meet specifications:
- Change the valve spring.
- Check the valve spring seat for breakage and wear (visual
check).
If the valve spring seat is broken or worn:
- Change the valve spring seat.
- Measure the thickness of the valve spring seat.
Valve spring
Valve spring seat
1.8 mm (0.071 in)
If the measured value does not meet specifications:
- Change the valve spring seat.
- Check exhaust valve guides
O
using the special tool.
I Limit plug gauge (59029026006) (
�
p. 298)
If the special tool is easy to insert into the valve guide:
- Change the valve guide and valve.
Check intake valve guides
4i}
using the special tool.
I Limit plug gauge (59029026006) (
�
p. 298)
If the special tool is easy to insert into the valve guide:
- Change the valve guide and valve.
- Check the sealing area of the spark plug thread and the valve
seats for damage and tearing.
If there is damage or cracking:
- Change the cylinder head.
Содержание F2303Q0
Страница 1: ...PIONEERING SINCE 1903 REPAIR MANUAL2017 FS 450 Art no 3403050en Husqvarna MOTORCYCLES ...
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Страница 159: ...BRAKE SYSTEM 16 Check the foot brake lever for a firm pressure point 157 ...
Страница 260: ...20 LUBRICATION SYSTEM Finishing work Check the engine oil level 0 p 252 258 ...