36 – English
Repair instructions
Cleaning and inspection
Clean all the carburettor components in petrol. Use
an airline to dry off the petrol from all components.
Blow through all the channels in the carburettor
body and check that they are not blocked.
Check that:
• The gasket, pump diaphragm and metering
diaphragm are undamaged.
• There is no play in the throttle and choke valves.
• The needle valve and its lever arm are not worn.
• The fuel fi lter is undamaged.
• The tips of the high and low speed jet screws
are not damaged.
• The air intake duct is not cracked.
Carburettor – reassembly
NOTE!
Cleanliness is very important when reas-
sembling the carburettor. Tiny particles of
dirt can cause operating problems.
The item numbers in the diagram refer to the steps
below (1–8).
Carburettor – dismantling
The item numbers in the diagram refer to the steps
below (1–7).
1
Remove the cover from the metering unit and
carefully remove the metering diaphragm and
gasket.
2
Undo the screw and take out the needle valve,
together with the lever arm, spindle and spring.
3
Remove the cover from the pump unit and carefully
remove the gasket and pump diaphragm.
4
Remove the fuel fi lter.
5
Remove the high, low and idling jet screws. (HDA
159A high and low jet screws are protected by
plastic caps which can be prised off with a screw-
driver. Only on EPA, see appendix A.)
6
Remove the plug by fi rst drilling a hole in it and
then prising it out with a screwdriver or the like.
7
If necessary remove the throttle and choke valves,
and remove the spindles together with the lever
arms and springs.
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