Checking The Valve Spring Seat; Checking The Cam Levers; Checking The Cylinder Head - Husqvarna FC 250 2017 Repair Manual

17 ENGINE
17.4.23
17.4.24
17.4.25
202

Checking the valve spring seat

305014-10

Checking the cam levers

302718-10

Checking the cylinder head

310348-10
Minimum length, inner
intake valve
Minimum length, outlet
valve
If the measured value does not meet specifications:
-
Change the valve springs.
-
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 seat - thick­
ness
If the measured value does not meet specifications:
-
Change the valve spring seat.
-
Check the cam levers and cam lever shafts for damage and
wear.
If there is damage or wear:
-
Change the cam levers and/or cam lever shafts.
O
-
Check valve guides using the special tool.
I Limit plug gauge (77229026000)
If the special tool is easy to insert in the valve guide:
-
Change the valve guide and valve.
-
Check the sealing area of the spark plug thread and the valve
seats from damage and cracking.
If there is damage or cracking:
-
Change the cylinder head.
39.20 mm (1.5433 in)
40.40 mm (1.5905 in)
1.40 ... 1.60 mm (0.0551
0.063 in)
(0 p. 301)