MOTO GUZZI 850-T Owner's Manual page 42

40
Adjusting the carburation (fig. 23)
The carburation is adjusted on a hot engine after
the inlet and exhaust tappets have been set at a
correct distance.
Proceed as follows:
1 With the carburetor rubber inlet manifold re-
moved, check that both gas valves open at the
same time. This is done by turning the throttle
·grip and at the same time feeling with your fin-
gers on the carburetor slides if these open simul-
taneously by the same amount.
Should one valve open before the other, correct
by setting screw .. C» in fig. 23 in the position
where by turning the throttle grip both valves
open simultaneously.
2 Adjust the idling speed by acting on the screw
.. 0» . Screwing this in reduces the fuel flow and
viceversa increases it. To adjust, tighten the
screw then undo it 2 to 2112 tu rns for the left
carburetor and 21/4 to 23/4 turns for the right
carburetor.
With the engine revolving at about 1000 -;- 1200
r. p. m. disconnect the plug lead of anyone of
the cylinders and lightly turn screw .. 0» of the
opposite carburetor to the position which will
give the best idling speed, i.e. until the engine
revs increase slightly.
The same operation should be repeated on the
carburetor of the opposite cylinder. This will
give a correct idling speed and prevent engine
popping.
Min. engine speed
Due to the constructive characteristics of this
engine, the idling speed adjustment should never
be made with the engine running at less than
1000 -;- 1200 r.p.m.
A good idling speed is obtained as follows:
3 Disconnect the right cylinder plug lead, start
the engine and ensure that it stops after firing
4-5 strokes; if it dies out earlier or later adjust
idling screw .. E» until the engine stops after
firing 4 or 5 times.
Repeat the same operation on the right cylinder,
with the left cylinder plug lead disconnected . •
If the right cylinder is normal, the engine should
stop after firing 4-5 strokes. If not, screw .. E»