O.S. Engines 2S Carb - 22884020 - Manual (Page 2)

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 f i l t e r s and
make sure that the fuel tank and your refuelling container
are clean. The use of an O.S. Super-Filter (Type S or Type L),
with its special double-filter system, is recommended. Installed
inside the refuelling can at its outiet, 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.
REALIGNMENT OF MIXTURE CONTROL VALVE
In the course of making carburettor adjustments, it is just
possible that the mixture control valve may be inadvertently
screwed in or out too far and thereby moved beyond its
effective adjustment range. Its factory setting, as indicated in
Fig. 2, can be re-established as follows:
When seen from above, with the throttle fully open, the
shouldered portion 'A' should be exactly at a tangent to the
throttle rotor hole. Therefore, to return the mixture control
valve to its original position, first screw-in the mixture
control valve while looking into the rotor hole until the
shouldered portion comes into view. (Fig. 1). Then, gradually
unscrew the mixture control valve until 'A' is precisely
tangential to the rotor hole (i.e. so that 'A' and 'B' are
superimposed) as in Fig. 2.
Idle-valve
(mixture control valve)
Metering needle
Fig.1 Fig.2
(A)
(B) (B)
(A)
PARTS LIST
Description
Mixture Control Valve Ass'y
"0"ring(L) for Mixture Control Valve
"0"ring(S) for Mixture Control Valve
Throttle Stop Screw Ass'y
Needle Valve Assembly
Needle
Needle Valve Holder Assembly
"0"ring for needle
Carburettor Body
Carburettor Rubber Gasket
Slide Valve
Metering Needle Assembly
Slide Valve Hook
Dust Cover
2 S
22884600
46066319
22781800
22884300
22884900
22884970
22884940
22881800
22884100
22615000
22884201
22884401
22884411
22884210
2SB
22884110
22884430
The specifications are subject to alteration for improvement without notice.
6-15 3-chome Irnagawa Higashisumiyoshi-ku
Osaka 546. Japan. TEL (06) 702-0225
FAX (06)704-2722
Copyright 1992 by O.S. Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 109203