Dnepr MT10-36 - Adjustment of Carburettors

A dj ustment of Carburettors
When operating the motorcycle, it is necessary to check and a· d-
just the engine operation at low- speed idling, synchronous operation
of the ca r burettors, operating economy, and also the operation of
car burettors con tro-1 drive.
Before
attempting to adjust the carburettors, check the follo-
wing:
the size of · spark gaps (0.6 to 0.75 mm), br eaker point gap
'(0.4 to 0.6 mm), as well as the clearance bet· ween the valve stem and
the rocker ends (0.07 mm).
Each carburettor must be adjusted separately when the engine
is warmed up.
To
adjust the left- hand carburettor during low - speed idling of
the engine, remove the cap from the spark pl ug of the right - hand
head, slacken check nut 30 (Fig . 1 3), screw in union 31, ensuring
that the clearance between the cable end piece and the union is 2 to
3
mm . Then loosen off the check nut fa steni ng screw 1, and screw
in the latt er so that the thro tt le is slightly raised and the engine
can develop a higher speed. Following that, turn home air -fuel ra-
tio
adjusting screw 18 and, as far as possible, reduce the engine
speed by turning screw 1 back . Aflter that, tmn back sc r ew 18 un til
such a positi on is ensured wherein the engine would operate smooth-
ly and develop t·he maximum speed. Then , by turning screw 1 back,
reduce the rotat i onal speed to the lowest possible steady speed (on
completing the adjustment, lock screws 18 and 1 by means of check
nuts) .
Taking hold of the cable, raise the throttle of the carburettor
being adjusted, if this will cause an increase in the rot ational
sp·eed, the adjustment may be finished.
Fit the cap on the spark pl· ug of the right-hand head, switch off
the left-hand cylinder and proceed to the adjustment of the r ight -
hand
carburettor. The adjustment proc ed ure for this carburettor is
the same as for the l eft-hand car , burettor.
The carburettors must ensure a uniform speed of the engine with
the left- and righ t- hand cylinders operating under idling conditions.
The accura cy of the adjustment is to be checked in the following
manner. On the operating, warmed-up engine with the carburettors
adjusted, switch of.f the cylinders one after the other, by alternately
removing the caps from the spark plugs of the right - and left-hand
cyl·inders.
Liste n to the eng i ne to check whether its speed is changing when
passing from operation at one cylinde r to the operation at the other.
If the engine speed at the right- an d left-hand cylinder ·s is different,
the canburettors mu st be adjusted hy turning in or out stop screws
1 of the throttles unt-il a uniform speed is obtained. Following that,
tighten up the check nuts of the stop screws.
To achieve a uniform, synchro n ous operation of the cylinders
set the motorcycle on a support, start the engine and engage the
fourth speed. Then switc h off one of the cylinders (detach the high -
3*
35-