O.S. Engines 2F Carb - 22681010 User Manual

Page 2

3. The Throttle Stop Screw is for setting the minimum idling speed.

If the engine runs too fast with the throttle closed, the Screw

should be turned counter-clockwise to allow the throttle opening
to be reduced.

SUBSEQUENT OPERATION AND CARE

Once the required settings have been established, it should be un-
necessary to alter them. Such slight needle-valve alterations as may
be necessary to cope with differences in atmospheric conditions or
fuels, do not affect the other two adjustments. The engine should

start readily with the throttle in the idle position. It is important
that the carburettor operates under clean conditions. Make sure
that fuel is properly filtered before use. We advise fitting a filter to
your fuel can and another filter in the delivery tube between tank
and engine, to reduce the risk of the carburettor jet becoming
partially clogged and upsetting running adjustments. Remember to
clean the filters periodically.

If, despite the use of filters, foreign matter should reach the carbu-

rettor, causing it to malfunction, it should be carefully dismantled

and cleaned as follows:

1. Remove complete carburettor from engine. Clean off any exter-

nal dirt.

2. Remove throttle stop screw.
3. Withdraw rotor from carburettor body, taking care not to lose

the rotor spring placed behind rotor.

4. Remove needle from needle-valve assembly, followed by hexago-

nal retaining nut and ratchet spring. Now push nozzle unit

through body from outside.

5. Remove fuel inlet nipple.
6. Immerse parts in solvent (e.g. gasoline, alcohol or carbon-tetra-

chloride) and clean thoroughly.

7. Re-assemble in reverse order. Note that periphery of nozzle

flange is specially shaped to key into carburettor body.

PARTS LIST

Description

Throttle lever (w/nut)

Throttle rotor

Mixture control screw (w/"0" ring)

Rotor spring

Carburettor body

Throttle stop screw (w/spring)

Fuel inlet (w/gasket)

Carburettor rubber gasket

Carburettor fixing screws

Needle valve assembly

Needle

Nozzle assembly

Ratchet spring

"0"ring

Silicone tubing

a°Q« 3 - K Code No

22681430

22681210

22681600

22481506

22681120

22681320
22681953

22615000

25081700
22681908

22681971

22681962

22611302

24881824

2FB

22681220

22681130

6-15 3-chome Imagawa Higashisumiyoshi-ku
Osaka 546, Japan. TEL (06) 702-0225

FAX. (06) 704-2722

59108