O.S. Engines 8AA Carb - 29383000 - Manual (Page 2)

PARTS LIST
Description
Needle Valve Assembly
Needle
Set-screw
"0" Ring
Needle Valve Holder
Ratchet Spring
Fuel Inlet
Rotor Guide Screw
Carburettor Fixing Screw
Carburettor Body
Carburettor Rubber Gasket
Rotor Spring
Venturi Insert
Carburettor Rotor
Mixture Control Screw
"0" Ring
Throttle Lever Assembly
5) If, after carrying out mixture adjustments, the idling
speed is found to be too high, the throttle trim lever
on the transmitter may be retarded until the desired
idling speed is obtained.
Note: Once the correct carburettor settings have been
established, it should be unnecessary to alter them.
Such slight needle-valve readjustments as may be
required to compensate for variations in atmospheric
conditions will not normally affect the other two
controls. Slight readjustments may be necessary for
optimum performance if different types of fuel,
glowplugs or propellers are used.
REALIGNMENT OF MIXTURE CONTROL SCREW
The Mixture Control Screw is factory set at the approxi-
mate best position. If, however, it has been tampered with,
or moved accidentally, the factory setting can be re-
established as follows:
1) Set the throttle rotor in the fully closed position;
2) Carefully screw in the Mixture Control Screw until it
stops;
3) Unscrew the Mixture Control Screw 2 1/2 turns.
CARBURETTOR CLEANLINESS
Minute particles of foreign matter (present, to some extent,
in all fuels) will cause problems if not removed before they
reach the carburettor jet. Use high quality fuel filters and
make sure that the fuel tank and your refuelling container
are clean. The use of an O.S. Super-Filter Type L, with its
special double-filter system, is recommended. Installed
inside the refuelling can at its outlet, it will prevent the
passage of foreign matter into the fuel tank, and a good
inline filter, between tank and carburettor, will give added
protection.
Remember to clean the filters regularly. It is also advisable
to check the carburettor, itself, at least once every 30
flights. Remove the needle-valve holder, using the open-
ended wrench supplied, and extract any remaining dirt or
fibres that may have lodged in this part of the carburettor
body. If allowed to build up, such material can restrict
fuel flow and cause the engine to stop; or to run lean, with
the attendant risk of engine damage due to overheating.
8.&3-K
Code No.
28281900
28281970
26381501
24981837
27381940
26711305
22681953
28281600
24925202
29381100
29315000
28281500
28281210
28281200
29381300
27881820
28281400
The specifications are subject to alteration for improvement without notice.
6-15 3-chome Imagawa Higashisumiyoshi-ku
Osaka 546, Japan. TEL. (06) 702-0225
FAX. (06) 704-2722
© Copyright 1990 by OS. Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan 19607