Decompression Valve; Inlet Manifold - Husqvarna 555FX Workshop Manual

Cylinder and piston
Remove the circlips from the gudgeon
pin.
Dismantle the piston.
502 52 42-01

Decompression valve

Clean the decompression valve and
check that the valve head is not
damaged (burnt) and that the valve
operates easily.
If necessary, grind the valve with fi ne-
grained valve grinding compound.
Using long-nose pliers remove the
gudgeon pin circlips.
Keep your thumb over the circlip to
prevent it from fl ying out.
Push the gudgeon pin from the piston
using punch 502 52 42-01.
If the pin is too tight, carefully warm the
piston.
Decompression valve
Clean the decompression valve using
a wire brush. Clean in white spirit or
thinner and blow dry with compressed
air.
Check that the hole (A) is not clogged.
Check that the valve moves easily in
the guide and that the valve head is not
damaged (burnt).
If necessary, grind the valve into the
seat using fi ne-grained valve grinding
compound.
Tip!
Use washer no. 502 54 11-01 as a
friction lining against the valve head
when grinding.

Inlet manifold

Check the distance piece (A) for cracks
or other damage that can cause leaks
between the carburettor and cylinder. Fit
a new distance piece if necessary.
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