Husqvarna 123HD60 Workshop Manual page 20

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Fuel system
Check the lever arm and needle valve for
wear.
Replace damaged parts with new parts.
Remove the pump diaphragm to check for
wear and damage.
Clean or replace the fuel screen.
Replace the needle valve's seat.
502 02 61-02
Check the position of the lever arm.
Check the wear to the lever arm partly
by the contact points against the control
diaphragm and partly by the cut-outs for
the needle valve.
Also check wear to the tip of the needle
valve and the groove for the lever arm.
Replace damaged parts with new parts.
Carefully remove the pump diaphragm
and its gasket.
Check the diaphragm for wear to the valve
fl aps (A). Hold it, for example, up to the
light to discover holes in the material.
Clean the fuel screen (B). Remove it for
replacement if necessary using a needle.
Press out the needle valve's seat for
replacement. Use a suitable punch
Ø 4.5 mm.
NOTE!
Replace the seat, needle valve and
lever arm at the same time.
The needle valve's seat should be
pressed in level with the carburettor
housing. Use a vice with soft jaw
guards to avoid damage to the
needle valve's seat.
Assemble the parts in the reverse order as
set out for dismantling.
Check that the lever arm lies fl ush with the
diaphragm housing.
Too high setting = too much fuel.
Too low setting = too little fuel.