Husqvarna R135 Workshop Manual page 24

Fuel system
Check the needle valve and the lever
arm for damage or wear.
Replace damaged components with
new ones.
Remove the pump diaphragm.
Check the diaphragm for damage.
Remove the fuel screen and clean it or
attach a new one.
Check the needle valve for damage on
the tip and in the lever arm groove.
Check the lever arm for damage to the
groove for the needle valve and wear on
the mounting points towards the control
diaphragm.
Replace damaged components with
new ones.
Remove the bolt holding the cover over
the pump diaphragm.
Lift off the cover (A), the gasket (B) and
the diaphragm (C).
Check the diaphragm for damage to
the valve tongues. If the valve tongues
are bent, the pump will not function in a
satisfactory manner.
Hold it up to a light as well to discover
any holes in the material.
Carefully remove the fuel screen (D),
using a needle for example. Clean or
replace the fuel screen.
NOTE!
During assembly the pump
diaphragm should lie closest
to the carburettor housing.
Pull the locking plugs (A) off over the jet
needles with the help of special tool 504
62 29-01 (left-hand threads) or screw
503 21 29-10 that holds the guard that is
screwed on the cylinder cover.
The plugs cannot be dismantled if the
slot in the plug is centred above the ball
(B) in the carburettor housing.
Unscrew the jet needles.
NOTE!
Note how the jets are positioned.
(For example, the H-needle is a
little shorter than the L-needle).
504 62 29-01
3
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