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When the crankshaft speed goes down as low as 1900 rpm
on the overrun, the control unit re-triggers the fuel cutoff solenoid
to feed fuel through the idle jet, and the engine gradually shifts to
idling.
Secondary barrel locking. The secondary throttle can open
only with the open choke when lever 5 edge (Fig.2-81) does not rest
against pin 2 of the secondary barrel lock lever.
In this case during throttle opening the lock lever operates lever
13 through lever 14 to open the secondary throttle.
When the choke is closing, lever 5 outer edge operates lock
lever pin 2 to disengage lever 14 and lock lever. Now the sec-
ondary throttle is locked out and cannot be opened.
Carburettor - removal and refitting
Carburettor removal and refitting is done on the cold engine
only. Start with removing the air cleaner. Next disconnect oper-
ating rod 15 (Fig. 2-87) from the throttle lever, followed by oper-
ating rod 3 and choke outer operating rod. Undo the retaining
screw and remove the part throttle channel heater.
Disconnect the idling overrun wiring from the shutoff solenoid
and idle switch. Undo the carburettor retaining nuts, remove the
carburettor and plug the intake pipe.
Fig.2-87. Carburettor linkage:
1 - longitudinal rod; 2 - rod securing clamp; 3 - choke cable; 4 - grommets; 5 - choke knob; 6 - shaft; 7 - throttle pedal; 8 - return spring lever; 9 - shaft support bracket;
10 - longitudinal rod end-piece; 11 - intermediate lever; 12 - bracket, intermediate lever; 13 - return valve bracket; 14 - return spring; 15 - transverse rod;
16 - carburettor
Refitting is a reversal of the removal procedure. Before refit-
ting, examine the carburettor heat screen and intake pipe/carbu-
rettor mating surfaces. Tighten the carburettor nuts to the torques
specified in Attachment 1.
WARNING. Never refit or tighten the retaining nuts on the
hot carburettor.
After refitting, adjust the carburettor linkage and engine idle.
The carburettor linkage should operate without seizures.
Carburettor - dismantling
Undo the retaining screws and remove the carburettor cover,
taking care not to damage the gasket, float and tubes of the full
throttle enrichment and secondary air correction systems.
Dismantle the carburettor cover.
Using a tool, carefully push out spindle 1 (Fig.2-88) of floats
3, providing you do not damage the float tabs, remove the floats.
Remove gasket 4, needle valve 2 seat, fuel supply pipe 11
and fuel filter 13.
Remove the housing of the idling fuel jet with fuel cutoff sole-
noid 10 and remove jet 9.
51
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