O.S. Engines 2S Carb - 22884020 User 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)

(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

109203