Dnepr MT10-36 - Care of Carburettors

tension wire from the spark plug), increase the engine speed until
the speedometer reads 50 km/h. Wait several seconds to make. sure
that the condition achieved is steady. Switch on the second cylinder
and, at the same time, switch off the first one. By turning the uni-
ons on the
carburettor covers, raise or lower the throttle until the
speedo meter indicates the same sp.eed. Since it takes re lati vely much
time to perform this ad ju stment , care mu st be ta ·ken to prevent 'the
engine from overheating.
When the throttle is fully rai sed, the amount of fuel passing
through the atomizer is dependent mainly on the throughput of the
main jet.
The engine operatio n under average load con ditions depends on
the position of the needle in the throttle , therefore, the ad ju stment
of the carburettors wilil consist in the selection of the proper posi-
tion of the needle. Whenever it is necessary to enrich the mixture
(for instance, when passing from the sum m er opera tin g period to
the winter, or during running-in period) or if the eng · ine power has
to be increased at the expense of its operating economy, the carbu-
rettors are also ad ju ste d by appropriately changing the position of
the needle.
The adjusting needle is linked to the throttle body by means of
reta · iner 23. The needle is provided with six an nul ar grooves . By
bringing the retainer into each of the grooves, it is possible to ob-
tai n six dif.ferent positions of the car , burettor a· djustment. The lower
the position of the needle, the weaker the mixtture, the higher the po-
s· ition of the needle, the richer the mixture.
In
the case of the average load opera~ion, the carburettor is che-
cked for
proper adjustment by sh arply inc-reasing the engine speed.
If, as the result of such an increase, bangs are heard in the carbu -
rettor, the mixture mu st be enriched by lifting the needles being ad -
justed, by one or two divi·sions.
Care of Carburettors
It is good praotke to wash and blow through the carburettors
after every 5000 km. Before washing the carburettors, screw off
plug 6 (Fig. 13), take out fuel filter 9 and wash it. Following that,
blo~v through the jet in the channel from plug 14 end. If idling jet
15 is clogged, screw it out and bl·ow through.
Never atte mpt to use a steel wire to clean the jets as this may
dis'tunb the jet cross -.section and, consequently, will · impair the car -
burettor operation.
Do not screw out the main jet, unless it is necessary to do so, as
this may cause damage to the jet itself and to its gasket.
In case the throttle has to be disman bled (change of the position
of
the adjusting needle, removing of the thrott1e cable ), detach the
throttle body and its s· ide piece by overcoming the effort of the ex-
pansion ~pring . The latter is also used as a check spring to prevent
an occasiOnal separation of the body and the side piece.
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