MAN-072
16
3.2-
CARBURETTOR SETTING
1 T.O.
*
RICH
LEAN
1
¼
T.O.
¾
T.O.
1
½
T.O.
*
T.O. = TURNS OPEN
Generally the correct settng of the carburettor screws is the following :
L (close the screw completely and then open): 2 and 05' T.O.
H (close the screw completely and then open): 50' T.O.
According to various factors as altitude and environmental temperature, it might be necessary to adjust the
carburettor settings to optimize the engine performance.
ATTENTION :
- Never lean excessively the mixture, the engine may overheat and seize up
-
Never force the screws H and L completely. This may damage the screws housing and make the
carburetor unusable.
-
The carburettor setting must be made on warm engine.
(H)
Torque the screw completely
and open at:
50' T.O.
(L)
Torque the screw completely and open
approx. at 2 and 05' T.O.
(I)
Turn the screw till to the
contact with throttle lever and
screw futher of 1 ½ T.O.
Start the engine and warm it. If the if RPM is
too high, set the screw l counterclockwise,
untill the clutch is disengaged.
If RPM
decreases
Unscrew
counterclockwise
untill max RPM is reached.
Unscrew just enough wich
allows to reach the idle.
(L)
Counterclockwise setting
If RPM
increases
Continue ad avvitare in senso
orario fintanto che non si
raggiunge il massimo regime
possibile. Svitare di quel tanto
che permetta un minimo
tendente al ricco.
Engine is now idling, turns at max gettable
RPM and will be tending on rich.
Adjust counterclockwise L screw until to
2.000 ÷ 2.500 rpm is reached.
Check again L screw for an optimal setting
The H screw setting can be only in working.
Set H screw to achieve the besT possible
RPM on straight. Set clockwise to increase
RPM and counterclockwise to reduce RPM.
Set L screw on rich of 1/8 ÷
¼ T.O.
Bad
acceleration
Go back to the idle and check acceleration
for a quick response and smooth pick-up.
Good
acceleration
The engine is ready
SCREW ( I )
OF MINIMUM
SETTING
SCREW ( L ) LOW SPEED MIXTURE
SCREW ( H ) HIGH SPEED MIXTURE
MMMIXTURESCREW
