O.S. Engines 2F Carb - 22681010 - 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
2F
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
© Copyright 1989 by O.S Engines Mfg. Co., Ltd. All rights reserved, Printed in Japan
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